Pydev 1.4.8 Released
Hi All, Pydev and Pydev Extensions 1.4.8 have been released Details on Pydev Extensions: http://www.fabioz.com/pydev Details on Pydev: http://pydev.sf.net Details on its development: http://pydev.blogspot.com Release Highlights in Pydev Extensions: - * Created public API for starting/finishing debug server * Import based on unresolved variables works correctly when the document is changed * Ignore error works correctly when the document is changed * No longer showing the replace button for the search Release Highlights in Pydev: -- * Debugger can jump to line * Reloading module when code changes in the editor if inside debug session * Usability improvement on the preferences pages (editor, code-formatter, comment block and code-style showing examples) * Pythonpath reported in the main tab was not correct for ironpython launch configs * Main module tab in launch configuration was not appearing for jython * Multiline block comments considering the current indentation (and working with tabs) * Hover works correctly when the document is changed * The interactive console no longer uses the UI thread (so, it doesn't make eclipse halt anymore on slow requests to the shell) * The interactive console save history now saves the contents in the same way they're written * When creating a python run, the classpath was being set (and overridden), which should only happen in jython runs * Fixed issue where a line with only tabs and a close parenthesis would have additional tabs entered on code-formatting * A Pydev (Jython) project can coexist with a JDT project (and properly use its info -- only project references worked previously) * Many small usability improvements (editors improved) * Verbosity option added to run as unit-test * No longer using respectJavaAccessibility=False for jython * When there are too many items to show in the debugger, handle it gracefully What is PyDev? --- PyDev is a plugin that enables users to use Eclipse for Python, Jython and Iron Python development -- making Eclipse a first class Python IDE -- It comes with many goodies such as code completion, syntax highlighting, syntax analysis, refactor, debug and many others. Cheers, -- Fabio Zadrozny -- Software Developer Aptana http://aptana.com/python Pydev Extensions http://www.fabioz.com/pydev Pydev - Python Development Environment for Eclipse http://pydev.sf.net http://pydev.blogspot.com -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
[ANN] PyIMSL Studio 1.5 released
Visual Numerics, a Rogue Wave Software Company, is pleased to announce the release of PyIMSL Studio V1.5. PyIMSL Studio contains both open source and proprietary components that create a fully supported and documented platform for analytic prototyping and production development. - For prototyping, a number of open source tools including Python, NumPy, Eclipse, matplotlib and commercial components from Visual Numerics, Inc. are available for Python, including PyIMSL Python wrappers to the mathematics and statistics algorithms in the IMSL C Library. This combination of tools provides a rich environment for prototype development. - For production deployment, PyIMSL Studio includes the IMSL C Library. Other I/O and data filtering components are available in both Python and C to further support deployment. Using the IMSL C Library provides parity between prototype and production code. This new release offers: - Support for IMSL C Library V7.0 which provides access to: - Numerous parallelized algorithms - New function that solves the generalized Feynman-Kac PDE and Black-Scholes problems - New data mining functions including a Genetic Algorithm for optimization and Naïve Bayes for classification problems and text mining - Many other new functions, including Kochanek-Bartels Cubic Splines, Non-central chi-square, and Non-central student's T PDFs - A more seamless installation process so you can get started with PyIMSL Studio faster and easier Learn more about PyIMSL Studio and request a free evaluation at http://www.vni.com/pyimslstudio -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
Re: Questions on XML
On Aug 21, 2009, at 7:15 PM, joy99 wrote: Dear Group, I like to convert some simple strings of natural language to XML. May I use Python to do this? If any one can help me, on this. I am using primarily UTF-8 based strings, like Hindi or Bengali. Can I use Python to help me in this regard? As a newbie, the thing that caused me trouble was importing a string into the XML parser. The parser seemed to want to open a file and I had a string. The solution was one of these: from xml.etree import ElementTree as et theXmlDataTree = et.parse(StringIO.StringIO(theXmlString)) from xml.etree import ElementTree as et theXmlDataTree = et.ElementTree(et.XML(theXmlString)) Not sure which you would use nor what the differences are. I have the first set commented out in my code so for some reason I switched to the second set of code to take a string and pull it into the XML parser. Once the string is in the parser, all the examples worked. It was getting it into the parser that had me stumped because none of the examples showed this situation, it appears to be obvious to someone who has used Python for a while. Kee -- http://mail.python.org/mailman/listinfo/python-list
Re: Questions on XML
On Aug 22, 10:53 am, Stefan Behnel stefan...@behnel.de wrote: Rami Chowdhury wrote: I am using primarily UTF-8 based strings, like Hindi or Bengali. Can I use Python to help me in this regard? I can say from experience that Python on Windows (at least, Python 2.5 on 32-bit Vista) works perfectly well with UTF-8 files containing Bangla. I have had trouble with working with the data in IDLE, however, which seems to prefer ASCII by default. Defaults almost never work for encodings. You have to be explicit: add an encoding declaration to the top of your source file if you use encoded literal strings in your code; use the codecs module with a suitable encoding to read encoded text files, and use an XML parser when reading XML. Stefan Dear Group, Thanx for your reply. Python works perfectly for Hindi and Bangla with Win XP. I never had a trouble. Best Regards, Subhabrata. -- http://mail.python.org/mailman/listinfo/python-list
Re: Questions on XML
I am using primarily UTF-8 based strings, like Hindi or Bengali. Can I use Python to help me in this regard? I can say from experience that Python on Windows (at least, Python 2.5 on 32-bit Vista) works perfectly well with UTF-8 files containing Bangla. I have had trouble with working with the data in IDLE, however, which seems to prefer ASCII by default. Defaults almost never work for encodings. You have to be explicit: add an encoding declaration to the top of your source file if you use encoded literal strings in your code; use the codecs module with a suitable encoding to read encoded text files, and use an XML parser when reading XML. Actually, default *should* work for XML. The default encoding for an XML file is UTF-8 (AFAIK). Cheers, Emm -- http://mail.python.org/mailman/listinfo/python-list
Re: Questions on XML
On Saturday 22 August 2009 08:13:33 joy99 wrote: On Aug 22, 10:53 am, Stefan Behnel stefan...@behnel.de wrote: Rami Chowdhury wrote: I am using primarily UTF-8 based strings, like Hindi or Bengali. Can I use Python to help me in this regard? I can say from experience that Python on Windows (at least, Python 2.5 on 32-bit Vista) works perfectly well with UTF-8 files containing Bangla. I have had trouble with working with the data in IDLE, however, which seems to prefer ASCII by default. Defaults almost never work for encodings. You have to be explicit: add an encoding declaration to the top of your source file if you use encoded literal strings in your code; use the codecs module with a suitable encoding to read encoded text files, and use an XML parser when reading XML. Stefan Dear Group, Thanx for your reply. Python works perfectly for Hindi and Bangla with Win XP. I never had a trouble. Best Regards, Subhabrata. You might also want to have a look at lxml. It can much more than the XML module in the default distribution, uses ElementTree as well, and is backed by the kickass, fast libxml library (http://codespeak.net/lxml/). It will allow you to use XSLs, for instance. Regardless of whether you use lxml or not, have a look at etree.iterparse, it is invaluable when processing huge XML documents. Cheers, Emm -- http://mail.python.org/mailman/listinfo/python-list
Re: convert date time
On Fri, Aug 21, 2009 at 11:44 PM, Ronn Rossronn.r...@gmail.com wrote: I'm new to python and I'm getting a date time from a field in the database that looks like this: 8/2/2009 8:36:16 AM (UTC) I want to split it into two fields one with the date formatted like this: -MM-DD 2009-08-02 and the time to be 24 hour or military time. How every you call it. Similar to this: 15:22:00 I found it easy to truncate off the (UTC), but having trouble converting the date. Can someone point me in the right direction? datetime.datetime.strptime() will give you a datetime object, which you can then format in a wide variety of ways using its strftime() method. Doesn't work with dates earlier than 1900, I believe. -- kushal -- http://mail.python.org/mailman/listinfo/python-list
Re: Using 'apply' as a decorator, to define constants
Jonathan Gardner wrote: On Aug 21, 9:09 am, alex23 wuwe...@gmail.com wrote: On Aug 21, 11:36 pm, Jonathan Fine jf...@pytex.org wrote: class ColourThing(object): @apply def rgb(): def fset(self, rgb): self.r, self.g, self.b = rgb def fget(self): return (self.r, self.g, self.b) return property(**locals()) This is brilliant. I am going to use this more often. I've all but given up on property() since defining get_foo, get_bar, etc... has been a pain and polluted the namespace. I think we can do better, with a little work. And also solve the problem that 'apply' is no longer a builtin in Python3. Here's my suggestion: === import wibble # Informs reader we're doing something special here. class ColourThing(object): @wibble.property def rgb(): '''This is the docstring for the property.''' def fset(self, rgb): self.r, self.g, self.b = rgb def fget(self): return (self.r, self.g, self.b) return locals() === And here's wibble.property() === _property = property # Avoid collision. def property(fn): return _property(doc=fn.__doc__, **fn()) === We can add apply() to the wibble module. By the way, 'wibble' is a placeholder to the real name. Any suggestions? -- Jonathan -- http://mail.python.org/mailman/listinfo/python-list
Re: Questions on XML
encoding declaration to the top of your source file if you use encoded literal strings in your code Any tips for how to set the encoding in IDLE? printing the Unicode strings works -- trying to repr() the variable chokes with a UnicodeDecodeError, and trying to enter the literals inside IDLE just gets me '?' characters instead. (this is Python 2.5 + IDLE installed from the Python-2.5.msi on python.org) - Rami Chowdhury Never assume malice when stupidity will suffice. -- Hanlon's Razor 408-597-7068 (US) / 07875-841-046 (UK) / 0189-245544 (BD) On Aug 21, 2009, at 22:53 , Stefan Behnel wrote: Rami Chowdhury wrote: I am using primarily UTF-8 based strings, like Hindi or Bengali. Can I use Python to help me in this regard? I can say from experience that Python on Windows (at least, Python 2.5 on 32-bit Vista) works perfectly well with UTF-8 files containing Bangla. I have had trouble with working with the data in IDLE, however, which seems to prefer ASCII by default. Defaults almost never work for encodings. You have to be explicit: add an encoding declaration to the top of your source file if you use encoded literal strings in your code; use the codecs module with a suitable encoding to read encoded text files, and use an XML parser when reading XML. Stefan -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
debugger
To get familiar with the debugger, I have loaded this program: import math def s1(x, y): a = (x + y) print(Answer from s1), a return def s2(x, y): b = (x - y) print(This comes from s2), b #print z print(call from s2: ), s1(x, y) return I am trying to debug: I press shift-F9 and F7. I end up in the interpreter where I enter s2 (1, 2). From that point if I press F7, the program restart all over. If I press Enter, the program gets out of debug mode. Please help me figuring out how I can use the dbugger. You are welcome to send a sound file if this is easier for you. Thanks ray -- http://mail.python.org/mailman/listinfo/python-list
How to 'de-slashify' a string?
Hi, if I have a string '\\303\\266', how can I convert it to '\303\266' in a general way? The problem I'm running into is that I'm connecting with pygresql to a postgres database and when I get fields that are of 'char' type, I get them in unicode, but when I get fields of 'byte' type, I get the text with quoted slashes, e.g. '\303' becomes '\\303' and so on. I saw posts online to do cursor.execute(set client-encoding to unicode) before running queries but this command causes an error. So I think I need a way to de-quote the slashes or alternatively some way to tell pygresql not to quote slashes for 'byte' fields. Any help, hints, etc appreciated.. -- AK -- http://mail.python.org/mailman/listinfo/python-list
Re: debugger
On Sat, Aug 22, 2009 at 6:17 PM, flagmino ray.belan...@gmail.com wrote: To get familiar with the debugger, I have loaded this program: import math def s1(x, y): a = (x + y) print(Answer from s1), a return def s2(x, y): b = (x - y) print(This comes from s2), b #print z print(call from s2: ), s1(x, y) return I am trying to debug: I press shift-F9 and F7. I end up in the interpreter where I enter s2 (1, 2). From that point if I press F7, the program restart all over. If I press Enter, the program gets out of debug mode. Please help me figuring out how I can use the dbugger. You are welcome to send a sound file if this is easier for you. Thanks ray -- http://mail.python.org/mailman/listinfo/python-list Sorry, but which debugger are you referring to? Also, note that you're printing s1(x,y) which is returning nothing. Not sure why you want to do that, but just mentioning it. -- http://mail.python.org/mailman/listinfo/python-list
Re: Using 'apply' as a decorator, to define constants
Why I've personally stopped using it: I've always had the impression that decorators were intended to provide a convenient and obvious way of augmenting functions. Having one that automatically executes the function at definition just runs counter to the behaviour I expect from a decorator. Especially when direct assignment... foo = foo () ...is a far more direct and clear way of expressing exactly what is happening. if you have to define it yourself, you could call it store_result or something else instead of apply. @store_result def tags(): return result Leonhard -- http://mail.python.org/mailman/listinfo/python-list
Re: Using 'apply' as a decorator, to define constants
On Sat, 22 Aug 2009 08:09:52 +0100, Jonathan Fine wrote: Jonathan Gardner wrote: On Aug 21, 9:09 am, alex23 wuwe...@gmail.com wrote: On Aug 21, 11:36 pm, Jonathan Fine jf...@pytex.org wrote: class ColourThing(object): @apply def rgb(): def fset(self, rgb): self.r, self.g, self.b = rgb def fget(self): return (self.r, self.g, self.b) return property(**locals()) This is brilliant. I am going to use this more often. I've all but given up on property() since defining get_foo, get_bar, etc... has been a pain and polluted the namespace. I think we can do better, with a little work. And also solve the problem that 'apply' is no longer a builtin in Python3. There's a standard idiom for that, using the property() built-in, for Python 2.6 or better. Here's an example including a getter, setter, deleter and doc string, with no namespace pollution, imports, or helper functions or deprecated built-ins: class ColourThing(object): @property def rgb(self): Get and set the (red, green, blue) colours. return (self.r, self.g, self.b) @rgb.setter def rgb(self, rgb): self.r, self.g, self.b = rgb @rgb.deleter def rgb(self): del self.r, self.g, self.b -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: Annoying octal notation
Il Fri, 21 Aug 2009 16:52:29 -0700 (PDT), James Harris ha scritto: 0xff 0x0e | 0b1101 16rff 16r0e | 2r1101 Hmm. Maybe a symbol would be better than a letter. What about 2_1011, 8_7621, 16_c26h or 2;1011, 8;7621, 16;c26h ? David -- http://mail.python.org/mailman/listinfo/python-list
Re: convert date time
On Aug 22, 5:11 pm, Kushal Kumaran kushal.kumaran+pyt...@gmail.com wrote: On Fri, Aug 21, 2009 at 11:44 PM, Ronn Rossronn.r...@gmail.com wrote: I'm new to python and I'm getting a date time from a field in the database that looks like this: 8/2/2009 8:36:16 AM (UTC) datetime.datetime.strptime() will give you a datetime object, which you can then format in a wide variety of ways using its strftime() method. Doesn't work with dates earlier than 1900, I believe. The datetime module works from 0001-01-01 onwards; see http://docs.python.org/library/datetime.html#datetime.MINYEAR Other things worth mentioning: (1) datetime.datetime.strptime() was introduced in Python 2.5; for Python 2.3 and 2.4, use time.strptime() [which may not like years before 1970] followed by datetime.datetime() (2) as the input has 12-hour clock plus AM/PM, ensure that you use %I instead of %H for the hour component; %H won't do what you expect if your expectation is not based on reading the docs :-) -- http://mail.python.org/mailman/listinfo/python-list
Re: Annoying octal notation
Il Fri, 21 Aug 2009 10:36:35 -0700 (PDT), Mensanator ha scritto: Aha! Then I WAS right after all. Switch to 3.1 and you'll soon be cured of that bad habit: 012 + 012 SyntaxError: invalid token (pyshell#4, line 1) I have tre (four) problems: 1) I am forced to use 2.5 since the production server has 2.5 installed. 2) Quite often I have to enter many zero-leading numbers and now my fingers put a leading zero almost everywhere 3) I don't understand why useless but *harmless* things like algebrically insignificant leading zeros should be *forbidden* and promoted to errors. 4) I still don't like the '0o..' notation because 0 (zero) and o (lowercase O) glyphs appear very similar in many character sets. I'd prefer something like '0c..' so it resembles the word 'oc' for 'octal'. David -- http://mail.python.org/mailman/listinfo/python-list
Re: How to 'de-slashify' a string?
Steven D'Aprano wrote:
On Sat, 22 Aug 2009 04:20:23 -0400, AK wrote:
Hi, if I have a string '\\303\\266', how can I convert it to '\303\266'
in a general way?
It's not clear what you mean.
Do you mean you have a string '\\303\\266', that is:
backslash backslash three zero three backslash backslash two six six
If so, then the simplest way is:
s = r'\\303\\266' # note the raw string
len(s)
10
print s
\\303\\266
print s.replace('', '\\')
\303\266
Another possibility:
s = '\\303\\266' # this is not a raw string
len(s)
8
print s
\303\266
So s is:
backslash three zero three backslash two six six
and you don't need to do any more.
Well, I need the string itself to become '\303\266', not to print
that way. In other words, when I do 'print s', it should display
unicode characters if my term is set to show them, instead of
showing \303\266.
The problem I'm running into is that I'm connecting with pygresql to a
postgres database and when I get fields that are of 'char' type, I get
them in unicode, but when I get fields of 'byte' type, I get the text
with quoted slashes, e.g. '\303' becomes '\\303' and so on.
Is pygresql quoting the backslash, or do you just think it is quoting the
backslashes? How do you know? E.g. if you have '\\303', what is the
length of that? 4 or 5?
Length is 4, and I need it to be length of 1. E.g.:
s = '\303'
s
'\xc3'
x = '\\303'
x
'\\303'
len(x)
4
len(s)
1
What I get from pygresql is x, what I need is s. Either by asking
pygresql to do this or convert it afterwards. I can't do
replace('\\303', '\303') because it can be any unicode character.
--
AK
--
http://mail.python.org/mailman/listinfo/python-list
Re: How to 'de-slashify' a string?
2009/8/22 AK a...@nothere.com:
Steven D'Aprano wrote:
On Sat, 22 Aug 2009 04:20:23 -0400, AK wrote:
Hi, if I have a string '\\303\\266', how can I convert it to '\303\266'
in a general way?
It's not clear what you mean.
Do you mean you have a string '\\303\\266', that is:
backslash backslash three zero three backslash backslash two six six
If so, then the simplest way is:
s = r'\\303\\266' # note the raw string
len(s)
10
print s
\\303\\266
print s.replace('', '\\')
\303\266
Another possibility:
s = '\\303\\266' # this is not a raw string
len(s)
8
print s
\303\266
So s is:
backslash three zero three backslash two six six
and you don't need to do any more.
Well, I need the string itself to become '\303\266', not to print
that way. In other words, when I do 'print s', it should display
unicode characters if my term is set to show them, instead of
showing \303\266.
The problem I'm running into is that I'm connecting with pygresql to a
postgres database and when I get fields that are of 'char' type, I get
them in unicode, but when I get fields of 'byte' type, I get the text
with quoted slashes, e.g. '\303' becomes '\\303' and so on.
Is pygresql quoting the backslash, or do you just think it is quoting the
backslashes? How do you know? E.g. if you have '\\303', what is the length
of that? 4 or 5?
Length is 4, and I need it to be length of 1. E.g.:
s = '\303'
s
'\xc3'
x = '\\303'
x
'\\303'
len(x)
4
len(s)
1
What I get from pygresql is x, what I need is s. Either by asking pygresql
to do this or convert it afterwards. I can't do replace('\\303', '\303')
because it can be any unicode character.
--
AK
--
http://mail.python.org/mailman/listinfo/python-list
Hi,
do you mean something like
u\u0303
u'\u0303'
print u\u0303
̃
̃ (dec.: 771) (hex.: 0x303) ̃ COMBINING TILDE (Mark, Nonspacing)
?
vbr
--
http://mail.python.org/mailman/listinfo/python-list
Re: Using 'apply' as a decorator, to define constants
On Sat, 22 Aug 2009 10:51:27 +0100, Jonathan Fine wrote: Steven D'Aprano wrote: There's a standard idiom for that, using the property() built-in, for Python 2.6 or better. Here's an example including a getter, setter, deleter and doc string, with no namespace pollution, imports, or helper functions or deprecated built-ins: class ColourThing(object): @property def rgb(self): Get and set the (red, green, blue) colours. return (self.r, self.g, self.b) @rgb.setter def rgb(self, rgb): self.r, self.g, self.b = rgb @rgb.deleter def rgb(self): del self.r, self.g, self.b Sorry, Steve, but I don't understand this. In fact, I don't even see how it can be made to work. Nevertheless, it does work, and it's not even magic. It's described (very briefly) in the docstring for property: help(property) will show it to you. More detail is here: http://docs.python.org/library/functions.html#property As for how it can work, it's not that difficult. All you need is for the setter and deleter methods to add an appropriate fset and fdel method to the property, then return it. Here's a toy example which may demonstrate the process (although unlike property, fget, fset and fdel don't have any special meanings): class ToyProperty(object): def __init__(self, fget, fset=None, fdel=None, fdoc=None): if fdoc is None: fdoc = fget.__doc__ self.fget = fget self.fset = fset self.fdel = fdel def getter(self, fget): self.fget = fget return self def setter(self, fset): self.fset = fset return self def deleter(self, fdel): self.fdel = fdel return self Unless an exception is raised, @wibble def wobble(): pass will make an assignment to wobble, namely the return value of wibble. So in your example above, there will be /three/ assignments to rgb. Yes. A tiny inefficiency, which only occurs when the class is created. If you care about that, then (1) use the full form of property() where you supply the fget, fset and fdel arguments all at once, and (2) you really need to get out into the fresh air more *wink* Unless you do some complicated introspection (and perhaps not even then) surely they will clobber each other. So what? The process is no weirder than: x = ['fget'] x = x + ['fset'] x = x + ['fdel'] -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: How to 'de-slashify' a string?
2009/8/22 AK a...@nothere.com:
Vlastimil Brom wrote:
2009/8/22 AK a...@nothere.com:
Steven D'Aprano wrote:
On Sat, 22 Aug 2009 04:20:23 -0400, AK wrote:
Hi, if I have a string '\\303\\266', how can I convert it to '\303\266'
in a general way?
It's not clear what you mean.
Do you mean you have a string '\\303\\266', that is:
backslash backslash three zero three backslash backslash two six six
If so, then the simplest way is:
s = r'\\303\\266' # note the raw string
len(s)
10
print s
\\303\\266
print s.replace('', '\\')
\303\266
Another possibility:
s = '\\303\\266' # this is not a raw string
len(s)
8
print s
\303\266
So s is:
backslash three zero three backslash two six six
and you don't need to do any more.
Well, I need the string itself to become '\303\266', not to print
that way. In other words, when I do 'print s', it should display
unicode characters if my term is set to show them, instead of
showing \303\266.
The problem I'm running into is that I'm connecting with pygresql to a
postgres database and when I get fields that are of 'char' type, I get
them in unicode, but when I get fields of 'byte' type, I get the text
with quoted slashes, e.g. '\303' becomes '\\303' and so on.
Is pygresql quoting the backslash, or do you just think it is quoting
the
backslashes? How do you know? E.g. if you have '\\303', what is the
length
of that? 4 or 5?
Length is 4, and I need it to be length of 1. E.g.:
s = '\303'
s
'\xc3'
x = '\\303'
x
'\\303'
len(x)
4
len(s)
1
What I get from pygresql is x, what I need is s. Either by asking
pygresql
to do this or convert it afterwards. I can't do replace('\\303', '\303')
because it can be any unicode character.
--
AK
--
http://mail.python.org/mailman/listinfo/python-list
Hi,
do you mean something like
u\u0303
u'\u0303'
print u\u0303
̃
̃ (dec.: 771) (hex.: 0x303) ̃ COMBINING TILDE (Mark, Nonspacing)
?
vbr
Yes, something like that except that it starts out as '\\303\\266', and it's
good enough for me if it turns into '\303\266', in fact that's rendered as
one unicode char. In other words, when you do:
print \\303\\266
'\303\266'
I need that result to become a python string, i.e. the slashes need to
be converted from literal slashes to escape slashes.
--
AK
--
http://mail.python.org/mailman/listinfo/python-list
Not sure, whether it is the right way of handling the such text data, but maybe:
decoded = '\\303\\266'.decode(string_escape)
decoded
'\xc3\xb6'
print decoded
ö
print '\303\266'
ö
It might be an IDLE issue, but it still isn't one unicode glyph.
I guess, you have to ensure, that the input data is valid and the
right encoding is used.
hth
vbr
--
http://mail.python.org/mailman/listinfo/python-list
Re: How to 'de-slashify' a string?
On Sat, 22 Aug 2009 06:09:20 -0400, AK wrote:
Is pygresql quoting the backslash, or do you just think it is quoting
the backslashes? How do you know? E.g. if you have '\\303', what is the
length of that? 4 or 5?
Length is 4, and I need it to be length of 1. E.g.:
s = '\303'
s
'\xc3'
x = '\\303'
x
'\\303'
len(x)
4
len(s)
1
What I get from pygresql is x, what I need is s. Either by asking
pygresql to do this or convert it afterwards. I can't do
replace('\\303', '\303') because it can be any unicode character.
Use the 'unicode-escape' codec to decode the byte-string to Unicode.
s = '\\303\\266'
print s
\303\266
s
'\\303\\266'
len(s)
8
u = s.decode('unicode-escape')
print u
ö
u
u'\xc3\xb6'
len(u)
2
--
Steven
--
http://mail.python.org/mailman/listinfo/python-list
Re: Using 'apply' as a decorator, to define constants
Steven D'Aprano wrote: On Sat, 22 Aug 2009 10:51:27 +0100, Jonathan Fine wrote: Steven D'Aprano wrote: There's a standard idiom for that, using the property() built-in, for Python 2.6 or better. Here's an example including a getter, setter, deleter and doc string, with no namespace pollution, imports, or helper functions or deprecated built-ins: class ColourThing(object): @property def rgb(self): Get and set the (red, green, blue) colours. return (self.r, self.g, self.b) @rgb.setter def rgb(self, rgb): self.r, self.g, self.b = rgb @rgb.deleter def rgb(self): del self.r, self.g, self.b Sorry, Steve, but I don't understand this. In fact, I don't even see how it can be made to work. Nevertheless, it does work, and it's not even magic. It's described (very briefly) in the docstring for property: help(property) will show it to you. More detail is here: http://docs.python.org/library/functions.html#property My apologies. I wasn't up to date with my Python versions: | Changed in version 2.6: The getter, setter, and deleter | attributes were added. I was still thinking Python2.5 (or perhaps earlier?). I still don't like it. All those repetitions of 'rgb'. -- Jonathan -- http://mail.python.org/mailman/listinfo/python-list
warnings.warn vs logging.warning
When I want to issue a warning, I am uncertain about the distinction between warnings.warn() and logging.warning(). My naive thought is to presume warning means the same thing in both cases, and so if I call logging.warning(), it should take care of making sure something equivalent to my calling warnings.warn() will happen... more than just having a message go to wherever a message to warnings.warn() would go. If I want to utilize the capabilities of both mechanisms (like having an exception raised), should I call both functions? -- http://mail.python.org/mailman/listinfo/python-list
Re: Annoying octal notation
Il Thu, 20 Aug 2009 16:59:14 -0700 (PDT), James Harris ha scritto: It maybe made sense once but this relic of the past should have been consigned to the waste bin of history long ago. I perfectly agree with you! David. -- http://mail.python.org/mailman/listinfo/python-list
Re: Need cleanup advice for multiline string
On Wed, 19 Aug 2009 10:51:08 -0700, Simon Forman wrote: (FWIW, I've always admired Humpty Dumpty's attitude to words. When I use a word, Humpty Dumpty said in rather a scornful tone, it means just what I choose it to mean -- neither more nor less. When you say admired, do you mean what the rest of us understand by admired, or something completely different? How about always, attitude, to and words? For all I know, you're talking about baking a birthday cake for your cat, by which I mean shaving off all your hair, and by hair I mean lunch and by shaving off I mean eating. Have you ever read R.A. Wilson's Quantum Psychology?) Perhaps I have, perhaps I haven't, it depends on who asks first. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
line completion
Hi, I wrote a program that takes some user input. Many inputs are quit often used by user, so when a user launch the program, and type in The Sha, he wants to get wshank Redemption displayed automatically in reversed color (black text on white background) along his cursor. When he decided to use The Shawshank Redemption, he just press the enter key, otherwise, he type in other words anyway. My question is, is there any module that can easy the implementation of this feature? Thanks. -- Life is the only flaw in an otherwise perfect nonexistence -- Schopenhauer narke public key at http://subkeys.pgp.net:11371 (narkewo...@gmail.com) -- http://mail.python.org/mailman/listinfo/python-list
Blank Line at Program Exit
Hi, Any python program, even that does absolutely nothing in the code, will cause a blank line printed out when the program exit. What's the reason? Thanks. -- Life is the only flaw in an otherwise perfect nonexistence -- Schopenhauer narke public key at http://subkeys.pgp.net:11371 (narkewo...@gmail.com) -- http://mail.python.org/mailman/listinfo/python-list
Re: generate keyboard/mouse event under windows
Read this and see if it helps: http://kvance.livejournal.com/985732.html -- http://mail.python.org/mailman/listinfo/python-list
Re: list 'results' from maps.google then crawl
Justin wrote: list 'results' from maps.google then crawl through the (engine of some sort) space to the 'results' website and look at it html to find the contact Good idea. How do you know how to recognise the contact? He/she might come disguised. Stefan -- http://mail.python.org/mailman/listinfo/python-list
generate keyboard/mouse event under windows
Hi, Anyone can give some help on how to generate keyboard mouse event under windows? (python 2.5) I tried pyhook, I only know how to monitor the keyboard/mouse events. but don't know how to generate/send the the event. thanks for any help. -Ray -- http://mail.python.org/mailman/listinfo/python-list
list 'results' from maps.google then crawl
list 'results' from maps.google then crawl through the (engine of some sort) space to the 'results' website and look at it html to find the contact -- http://mail.python.org/mailman/listinfo/python-list
Re: grokproject and zope.security==3.4.1 error
Manuel A. Iglesias Abbatemarco schrieb: I will apprreciate if someone could help me with the following error. I a trying to create a grokproject application in my debian 5.0 box, the following is the output after executing # grokproject Sample command. Getting distribution for 'zope.security==3.4.1'. src/zope/security/_proxy.c:19:20: error: Python.h: No such file or directory sudo apt-get install python2.4-dev Have fun :) Christian -- http://mail.python.org/mailman/listinfo/python-list
Re: Annoying octal notation
Dennis Lee Bieber wrote: On Fri, 21 Aug 2009 16:52:29 -0700 (PDT), James Harris james.harri...@googlemail.com declaimed the following in gmane.comp.python.general: So you are saying that Smalltalk has base in decimalrnumber where r is presumably for radix? That's maybe best of all. It preserves the syntactic requirement of starting a number with a digit and seems to have greatest flexibility. Not sure how good it looks but it's certainly not bad. 0xff 0x0e | 0b1101 16rff 16r0e | 2r1101 Hmm. Maybe a symbol would be better than a letter. Or Ada's16#FF#, 8#377#... '#' starts a comment, so that's right out! :-) I forget if DEC/VMS FORTRAN or Xerox Sigma FORTRAN used x'FF' or 'FF'x, and o'377' or '377'o -- http://mail.python.org/mailman/listinfo/python-list
Re: Annoying octal notation
David wrote: Il Fri, 21 Aug 2009 16:52:29 -0700 (PDT), James Harris ha scritto: 0xff 0x0e | 0b1101 16rff 16r0e | 2r1101 Hmm. Maybe a symbol would be better than a letter. What about 2_1011, 8_7621, 16_c26h or 2;1011, 8;7621, 16;c26h ? '_': what if in the future we want to allow them in numbers for clarity? ';': used to separate multiple statements on a line (but not used that often). -- http://mail.python.org/mailman/listinfo/python-list
Re: PIL and Python
If I make it work, i will send the solution. Thank you ! -- http://mail.python.org/mailman/listinfo/python-list
Re: debugger
Albert Hopkins wrote: On Sat, 2009-08-22 at 01:17 -0700, flagmino wrote: [...] I am trying to debug: I press shift-F9 and F7. I end up in the interpreter where I enter s2 (1, 2). From that point if I press F7, the program restart all over. If I press Enter, the program gets out of debug mode. Umm.. which debugger is that? My debugger doesn't have shift-F9... then you probably not working under windows ... Stef -- http://mail.python.org/mailman/listinfo/python-list
Re: How to 'de-slashify' a string?
Vlastimil Brom vlastimil.b...@gmail.com (VB) wrote:
decoded = '\\303\\266'.decode(string_escape)
decoded
VB '\xc3\xb6'
print decoded
VB ö
print '\303\266'
VB ö
VB It might be an IDLE issue, but it still isn't one unicode glyph.
VB I guess, you have to ensure, that the input data is valid and the
VB right encoding is used.
decoded = '\\303\\266'.decode(string_escape).decode('utf-8')
decoded
u'\xf6'
print decoded
ö
--
Piet van Oostrum p...@cs.uu.nl
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: p...@vanoostrum.org
--
http://mail.python.org/mailman/listinfo/python-list
Re: debugger
Stef Mientki wrote: Albert Hopkins wrote: On Sat, 2009-08-22 at 01:17 -0700, flagmino wrote: [...] I am trying to debug: I press shift-F9 and F7. I end up in the interpreter where I enter s2 (1, 2). From that point if I press F7, the program restart all over. If I press Enter, the program gets out of debug mode. Umm.. which debugger is that? My debugger doesn't have shift-F9... then you probably not working under windows ... Even under Windows, you still have to specify your environment. In both Win32 and *nix I use pdb as my debugger and shift+F9 does nothing ;-) So the question is what is the debugger the OP is using? Because it's not pdb. :) -tkc -- http://mail.python.org/mailman/listinfo/python-list
Re: Annoying octal notation
On 2009-08-22, Dennis Lee Bieber wlfr...@ix.netcom.com wrote: On Fri, 21 Aug 2009 10:45:51 -0700, John Nagle na...@animats.com declaimed the following in gmane.comp.python.general: And it's over. We can finally dispense with octal by default. I've not looked at modern Intel processor format, but if there are folks still using variants of 8080 (8051?) and Z-80, Octal still works nice for op-codes... I don't recall the exact values, but the MOV instruction was something like '1SD'o, where S and D are three bit register specifications (A, B, C, D, E, H, L, and Memory as I recall) The Heathkit's terminal I have uses a Z80, and IIRC, the assembly listings were in split-octal [a 16 bit word ranges from 000 000 to 377 377]. Stuff for the PDP-11 (which also had instruction fields 3 bits wide) was always in octal as well. The PDP-11 is pretty much dead, but I think there are embedded Z80 derivitives still in use. -- Grant -- http://mail.python.org/mailman/listinfo/python-list
your favorite debugging tool?
Hi all, What is your favorite tool to help you debug your code? I've been getting along with 'print' statements but that is getting old and somewhat cumbersome. I'm primarily interested in utilities for Linux (but if you have recommendations for Windows, I'll take them too :) I use emacs as my primary development environment, FWIW. Someone mentioned winpdb .. anyone have experience/comments on this? Others? Thanks, Esmail -- http://mail.python.org/mailman/listinfo/python-list
Re: debugger
flagmino wrote: To get familiar with the debugger, I have loaded this program: import math def s1(x, y): a = (x + y) print(Answer from s1), a return def s2(x, y): b = (x - y) print(This comes from s2), b #print z print(call from s2: ), s1(x, y) return I am trying to debug: I press shift-F9 and F7. I end up in the interpreter where I enter s2 (1, 2). From that point if I press F7, the program restart all over. If I press Enter, the program gets out of debug mode. Please help me figuring out how I can use the dbugger. You are welcome to send a sound file if this is easier for you. Thanks ray You need to tell us: Which Python version (e.g. 2.6.2) Which platform (hardware OS) (e.g. 64-bit AMD FreeBSD) Which debugger (e.g. Idle) What you expected to happen that did not, and why you expected it. or What happened and why you did not expect it. Often you can lots of this information by going to your debugger window and doing Help // About, and go to your Python environment and type: import sys print sys.version # cut the results and paste in your message as sys.version says, '2.6.2 (r262:71605, ...' [don't do dots yourself] To understand more of why we need this on every question, see: http://www.mikeash.com/getting_answers.html or google for smart questions. --Scott David Daniels scott.dani...@acm.org -- http://mail.python.org/mailman/listinfo/python-list
Re: your favorite debugging tool?
In article mailman.227.1250951162.2854.python-l...@python.org, Esmail ebo...@hotmail.com wrote: What is your favorite tool to help you debug your code? I've been getting along with 'print' statements but that is getting old and somewhat cumbersome. Despite the fact that I've been using Python for more than a decade, print is still my mainstay (or possibly logging to a file). -- Aahz (a...@pythoncraft.com) * http://www.pythoncraft.com/ I support family values -- Addams family values --www.nancybuttons.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Blank Line at Program Exit
Steven Woody wrote: Hi, Any python program, even that does absolutely nothing in the code, will cause a blank line printed out when the program exit. What's the reason? Thanks. I think the blank line is coming from your shell. In Windows, I believe the shell emits a newline after running a program, probably to make sure the prompt starts in column 0. Note that if your python program writes a partial line to stdout, this will finish the line before giving you the next prompt. So the line isn't necessarily blank. DaveA -- http://mail.python.org/mailman/listinfo/python-list
Re: TypeError while checking for permissions with os.access() on windows xp
First, some nitpicking: Include the whole traceback when posting about
errors please. Don't write if some_boolean_expression != True:
instead prefer if not some_boolean_expression:. Also, in your code
except (Except), ex: return ex the parentheses are redundant,
there's no Except Exception (unless you created one yourself) and
why are you catching and returning the Exception object? (Also,
what's that sys.exit(0) doing in there? And why exit with 0 if there
was a problem? Exit code 0 means no problem.)
Second, from what you've said backup_dest must be None:
import os
os.access(None, os.W_OK)
Traceback (most recent call last):
File pyshell#1, line 1, in module
os.access(None, os.W_OK)
TypeError: coercing to Unicode: need string or buffer, NoneType found
No, backup_dest is destination for backup. It's this variable:
*backup_dest = self.__backup_dest* .
*self.__backup_dest = os.getenv('HOME')* - as you can see,
self.__backup_dest is a reference to the home directory which is a
string. Then backup_dest is a reference to the variable
self.__backup_dest. But that second reference seems to be recognised as
a NoneType ??
I'm using optparse in my script (that code for checking for permission
is a part of my backup script).
Maybe i post my complete code:
#!/usr/bin/env python
#-*- coding: utf-8 -*-
#MyBackUper
import os, sys, tarfile
import datetime
from optparse import OptionParser
class Except(Exception):
pass
class Packer(Except):
def __init__(self):
self.__backup_dest = os.getenv('HOME')
__current_time = datetime.datetime.today().strftime('%Y-%m-%d
%H:%M:%S')
Except.__init__(self)
def doc_note(self):
print
DOCUMENTATION
'Backuper' is a script for doing backups.
You can backup with it single files or whole directories.
For available commands type 'backuper.py -h' or 'backuper.py
--help'.
Using it is simple:
- to backup single file, type:
'backuper.py -f FILE_PATH BCKP_NAME [DEST_PATH]',
where 'FILE_PATH' is exact path to prefered file which you want
to backup and 'BCKP_NAME' is the name for backup output file. Default
'DEST_PATH' is placed in home directory, it can't be changed.
'BCKP_NAME' must be given;
- to backup whole directory, type:
'backuper.py -d DIR_PATH BCKP_NAME [DEST_PATH]', where
'DIR_PATH' is exact path to prefered directory, which you want to backup
and 'BCKP_NAME' is the name for backup output file. Default 'DEST_PATH'
is placed in home directory, it can't be changed. 'BCKP_NAME' must be given;
def __check_set_perm(self, rd_obj_path, backup_dest):
try:
if os.path.exists(rd_obj_path):
if not os.access(rd_obj_path, os.R_OK):
print Have no permissions on [%s] for reading
operation.\nTrying to set them... % os.path.split(rd_obj_path)[1]
if not os.path.isdir(rd_obj_path):
os.chmod(rd_obj_path, stat.S_IREAD)
else:
for root, dirs, files in os.walk(rd_obj_path):
for f in files:
os.chmod(os.path.join(root, f),
stat.S_IREAD)
print Get permissions for reading on [%s]
successfully. % os.path.split(rd_obj_path)[1]
else:
print Have permissions on [%s] for reading. %
os.path.split(rd_obj_path)[1]
if not os.access(backup_dest, os.W_OK):
print Have no permissions on [%s] for writing
operation.\nTrying to set them... % os.path.split(backup_dest)[1]
os.chmod(backup_dest, stat.S_IWRITE)
print Get permissions for reading on [%s]
successfully. % os.path.split(backup_dest)[1]
else:
print Have permissions on [%s] for writing. %
os.path.split(backup_dest)[1]
else:
return Can't find specified path - [%s]. % rd_obj_path
sys.exit(1)
except (Except), ex:
return ex
def backup_file(self, rd_obj_path, bkp_obj_name):
try:
if os.name == nt:
rd_obj_path = rd_obj_path.replace('~/', '%s\\' %
os.getenv('HOME')).replace('\\', '')
backup_dest = self.__backup_dest
print Checking permissions for reading and writing...
self.__check_set_perm(rd_obj_path, backup_dest)
backup_obj = tarfile.open(%s\\%s(%s).tar.bz2 %
(backup_dest, bkp_obj_name, __current_time), 'w:bz2')
else:
rd_obj_path = rd_obj_path.replace('~/', '%s/' %
os.getenv('HOME'))
backup_dest = self.__backup_dest
print Checking permissions for reading and writing...
self.__check_set_perm(rd_obj_path, backup_dest)
backup_obj = tarfile.open(%s/%s(%s).tar.bz2 %
(backup_dest,
Re: Decompressing gzip over FTP
On Fri, 2009-08-21 at 18:15 -0700, SeanMon wrote: Is there a way to decompress a large (2GB) gzipped file being retrieved over FTP on the fly? I'm using ftplib.FTP to open a connection to a remote server, and I have had no success connecting retrbinary to gzip without using an intermediate file. Is there any way to get a file-like object describing the remote file, or a way to utilize gzip's decompression without providing it a file- like object? I tried to solve your problem with StringIO and .truncate(). I also tried to solve it with us.pipe(), but was unsuccessful with either. The problem is the gzip module uses .seek() which you can't do with pipes... You could probably get away with just using the compress module (as zlib does) but you will have to deal with handling the headers, footers, CRC checks, etc. on your own. The cheap alternative is to just have your script open a pipe to gunzip -c and read/write from that pipe. hth, -a -- http://mail.python.org/mailman/listinfo/python-list
Re: debugger
Stef Mientki wrote: div class=moz-text-flowed style=font-family: -moz-fixedAlbert Hopkins wrote: On Sat, 2009-08-22 at 01:17 -0700, flagmino wrote: [...] I am trying to debug: I press shift-F9 and F7. I end up in the interpreter where I enter s2 (1, 2). From that point if I press F7, the program restart all over. If I press Enter, the program gets out of debug mode. Umm.. which debugger is that? My debugger doesn't have shift-F9... then you probably not working under windows ... Stef /div That doesn't help. If you want help, describe the environment. Python version, OS, and what command you did to start this debugger. Or at least its name. The Windows debugger is called Debug.exe, and it doesn't accept Shift-F9. But I doubt the OP was talking about that one. Komodo doesn't seem to do anything with Shift-F9 either. PythonWin doesn't seem to, nor does Idle. Most of these could be customized, but that's besides the point. In version: 2.6.2 (r262:71600, Apr 21 2009, 15:05:37) [MSC v.1500 32 bit (Intel)], running under XPsp3, with win32 extensions loaded, there are a bunch of files called debug or debugger. Which one might be meant here? Or perhaps the debugger was part of NetBeans, or Eclipse, or some other IDE? DaveA -- http://mail.python.org/mailman/listinfo/python-list
Re: Blank Line at Program Exit
On Thu, Aug 20, 2009 at 01:31:14PM +0800, Steven Woody wrote: Hi, Any python program, even that does absolutely nothing in the code, will cause a blank line printed out when the program exit. What's the reason? Thanks. Chances are it is related to whichever operating system and/or shell you are using. For instance, this is taken from a system running Ubuntu Linux 8.04: - laptop:$ cat hello.py #!/usr/bin/env python print Hello, there! laptop:$ ./hello.py Hello, there! laptop:$ cat nothing.py #!/usr/bin/env python laptop:$ ./nothing.py laptop:$ - As you can see, no blank line was printed out. -- http://mail.python.org/mailman/listinfo/python-list
Re: debugger
Dave Angel wrote: Stef Mientki wrote: div class=moz-text-flowed style=font-family: -moz-fixedAlbert Hopkins wrote: On Sat, 2009-08-22 at 01:17 -0700, flagmino wrote: [...] I am trying to debug: I press shift-F9 and F7. I end up in the interpreter where I enter s2 (1, 2). From that point if I press F7, the program restart all over. If I press Enter, the program gets out of debug mode. Umm.. which debugger is that? My debugger doesn't have shift-F9... then you probably not working under windows ... Stef /div That doesn't help. If you want help, describe the environment. Python version, OS, and what command you did to start this debugger. Or at least its name. The Windows debugger is called Debug.exe, and it doesn't accept Shift-F9. But I doubt the OP was talking about that one. Komodo doesn't seem to do anything with Shift-F9 either. PythonWin doesn't seem to, nor does Idle. Most of these could be customized, but that's besides the point. In version: 2.6.2 (r262:71600, Apr 21 2009, 15:05:37) [MSC v.1500 32 bit (Intel)], running under XPsp3, with win32 extensions loaded, there are a bunch of files called debug or debugger. Which one might be meant here? Or perhaps the debugger was part of NetBeans, or Eclipse, or some other IDE? It might be winpdb, although I haven't been able to confirm it. -- http://mail.python.org/mailman/listinfo/python-list
Re: TypeError while checking for permissions with os.access() on windows xp
ryniek90 wrote:
div class=moz-text-flowed style=font-family: -moz-fixed
First, some nitpicking: Include the whole traceback when posting about
errors please. Don't write if some_boolean_expression != True:
instead prefer if not some_boolean_expression:. Also, in your code
except (Except), ex: return ex the parentheses are redundant,
there's no Except Exception (unless you created one yourself) and
why are you catching and returning the Exception object? (Also,
what's that sys.exit(0) doing in there? And why exit with 0 if there
was a problem? Exit code 0 means no problem.)
Second, from what you've said backup_dest must be None:
import os
os.access(None, os.W_OK)
Traceback (most recent call last):
File pyshell#1, line 1, in module
os.access(None, os.W_OK)
TypeError: coercing to Unicode: need string or buffer, NoneType found
No, backup_dest is destination for backup. It's this variable:
*backup_dest = self.__backup_dest* .
*self.__backup_dest = os.getenv('HOME')* - as you can see,
self.__backup_dest is a reference to the home directory which is a
string. Then backup_dest is a reference to the variable
self.__backup_dest. But that second reference seems to be recognised
as a NoneType ??
I'm using optparse in my script (that code for checking for permission
is a part of my backup script).
Maybe i post my complete code:
#!/usr/bin/env python
#-*- coding: utf-8 -*-
#MyBackUper
import os, sys, tarfile
import datetime
from optparse import OptionParser
class Except(Exception):
pass
class Packer(Except):
def __init__(self):
self.__backup_dest = os.getenv('HOME')
__current_time = datetime.datetime.today().strftime('%Y-%m-%d
%H:%M:%S')
Except.__init__(self)
def doc_note(self):
print
DOCUMENTATION
'Backuper' is a script for doing backups.
You can backup with it single files or whole directories.
For available commands type 'backuper.py -h' or 'backuper.py
--help'.
Using it is simple:
- to backup single file, type:
'backuper.py -f FILE_PATH BCKP_NAME [DEST_PATH]',
where 'FILE_PATH' is exact path to prefered file which you want
to backup and 'BCKP_NAME' is the name for backup output file. Default
'DEST_PATH' is placed in home directory, it can't be changed.
'BCKP_NAME' must be given;
- to backup whole directory, type:
'backuper.py -d DIR_PATH BCKP_NAME [DEST_PATH]', where
'DIR_PATH' is exact path to prefered directory, which you want to
backup and 'BCKP_NAME' is the name for backup output file. Default
'DEST_PATH' is placed in home directory, it can't be changed.
'BCKP_NAME' must be given;
def __check_set_perm(self, rd_obj_path, backup_dest):
try:
if os.path.exists(rd_obj_path):
if not os.access(rd_obj_path, os.R_OK):
print Have no permissions on [%s] for reading
operation.\nTrying to set them... % os.path.split(rd_obj_path)[1]
if not os.path.isdir(rd_obj_path):
os.chmod(rd_obj_path, stat.S_IREAD)
else:
for root, dirs, files in os.walk(rd_obj_path):
for f in files:
os.chmod(os.path.join(root, f),
stat.S_IREAD)
print Get permissions for reading on [%s]
successfully. % os.path.split(rd_obj_path)[1]
else:
print Have permissions on [%s] for reading. %
os.path.split(rd_obj_path)[1]
if not os.access(backup_dest, os.W_OK):
print Have no permissions on [%s] for writing
operation.\nTrying to set them... % os.path.split(backup_dest)[1]
os.chmod(backup_dest, stat.S_IWRITE)
print Get permissions for reading on [%s]
successfully. % os.path.split(backup_dest)[1]
else:
print Have permissions on [%s] for writing. %
os.path.split(backup_dest)[1]
else:
return Can't find specified path - [%s]. % rd_obj_path
sys.exit(1)
except (Except), ex:
return ex
def backup_file(self, rd_obj_path, bkp_obj_name):
try:
if os.name == nt:
rd_obj_path = rd_obj_path.replace('~/', '%s\\' %
os.getenv('HOME')).replace('\\', '')
backup_dest = self.__backup_dest
print Checking permissions for reading and writing...
self.__check_set_perm(rd_obj_path, backup_dest)
backup_obj = tarfile.open(%s\\%s(%s).tar.bz2 %
(backup_dest, bkp_obj_name, __current_time), 'w:bz2')
else:
rd_obj_path = rd_obj_path.replace('~/', '%s/' %
os.getenv('HOME'))
backup_dest = self.__backup_dest
print Checking permissions for reading and writing...
self.__check_set_perm(rd_obj_path, backup_dest)
string literal vs string variable
On Aug 22, 2009, at 3:32 AM, Stefan Behnel wrote: You can use both, but I suspect parsing from StringIO to be slower than parsing from the string directly. That's the case for lxml, at least. Note that fromstring() behaves the same as XML(), but it reads better when parsing from a string variable. XML() reads better when parsing from a literal string. I'm not sure I know the difference between a string variable and a literal string. Is the difference as simple as: somestring = u'stuffhello world/stuff' fromstring(somestring) -- string variable vs XML(u'stuffhello world/stuff') -- literal string Kee -- http://mail.python.org/mailman/listinfo/python-list
Urllib2 not working
Hello,
When I try to open a URL using urllib2.urlopen it returns Name or service
not known. It is not a problem with my Internet I believe, since I have
Internet access on my computer, and I have verified it is not a syntax, or
spelling, error on my part. I have also tried accessing the site (google.com)
by IP like so:
urllib2.urlopen('http://74.125.67.100/')
but this does not work either.
This is a traceback of an attempt to access it through its URL (
http://www.google.com/)
http://dpaste.com/84016/
Any help would be very appreciated.
--
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sed/awk/perl: How to replace all spaces each with an underscore that occur before a specific string ?
sed/awk/perl: How to replace all spaces each with an underscore that occur before a specific string ? I really prefer a sed one liner. Example Input : This is my book. It is too thick to read. The author gets little royalty but the publisher makes a lot. Output: This_is_my_book._It_is_too__thick_to read. The author gets little royalty but the publisher makes a lot. We replaced all the spaces with underscores before the first occurence of the string to . Thanks Gnuist -- http://mail.python.org/mailman/listinfo/python-list
Re: sed/awk/perl: How to replace all spaces each with an underscore that occur before a specific string ?
On Aug 22, 1:11 pm, bolega gnuist...@gmail.com wrote:
sed/awk/perl:
How to replace all spaces each with an underscore that occur before a
specific string ?
I really prefer a sed one liner.
Example
Input : This is my book. It is too thick to read. The author gets
little royalty but the publisher makes a lot.
Output: This_is_my_book._It_is_too__thick_to read. The author gets
little royalty but the publisher makes a lot.
We replaced all the spaces with underscores before the first occurence
of the string to .
Thanks
Gnuist
awk 'BEGIN{FS=OFS=to }{gsub(/ /,_,$1);print}' myfile
--
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Python - insert image / pdf / blob files to MySQL, MSSQL
Where to find code examples? Or someone can post sample codes here. Thanks -- http://mail.python.org/mailman/listinfo/python-list
Re: Annoying octal notation
On Sat, Aug 22, 2009 at 10:03:35AM +1000, Ben Finney wrote: and the former is virtually indistinguishable from 00012, O0012, or many other combinations that someone might accidentally type (or intentionally type, having to do this in dozens of other programming languages). Only if you type the letter in uppercase. The lower-case ‘o’ is much easier to distinguish. It is easier, but I dispute that it is much easier. Whether or not you find ‘0o012’ easily distinguishable as a non-decimal notation, it's undoubtedly easier to distinguish than ‘012’. 012 has meant decimal 10 in octal to me for so long, from its use in MANY other programming languages, that I disagree completely. I can see how 012 can be confusing to new programmers, but at least it's legible, and the great thing about humans is that they can be taught (usually). I for one think this change is completely misguided. These human programmers, whether newbies or long-experienced, also deal with decimal numbers every day, many of which are presented as a sequence of digits with leading zeros — and we continue to think of them as decimal numbers regardless. Having the language syntax opposed to that is ...consistent with virtually every other popular programming language. -- Derek D. Martin http://www.pizzashack.org/ GPG Key ID: 0x81CFE75D pgpaLprG9uUPz.pgp Description: PGP signature -- http://mail.python.org/mailman/listinfo/python-list
Re: TypeError while checking for permissions with os.access() on windows xp
First, some nitpicking: Include the whole traceback when posting about
errors please. Don't write if some_boolean_expression != True:
instead prefer if not some_boolean_expression:. Also, in your code
except (Except), ex: return ex the parentheses are redundant,
there's no Except Exception (unless you created one yourself) and
why are you catching and returning the Exception object? (Also,
what's that sys.exit(0) doing in there? And why exit with 0 if there
was a problem? Exit code 0 means no problem.)
Second, from what you've said backup_dest must be None:
import os
os.access(None, os.W_OK)
Traceback (most recent call last):
File pyshell#1, line 1, in module
os.access(None, os.W_OK)
TypeError: coercing to Unicode: need string or buffer, NoneType found
No, backup_dest is destination for backup. It's this variable:
*backup_dest = self.__backup_dest* .
*self.__backup_dest = os.getenv('HOME')* - as you can see,
self.__backup_dest is a reference to the home directory which is a
string. Then backup_dest is a reference to the variable
self.__backup_dest. But that second reference seems to be recognised
as a NoneType ??
I'm using optparse in my script (that code for checking for
permission is a part of my backup script).
Maybe i post my complete code:
#!/usr/bin/env python
#-*- coding: utf-8 -*-
#MyBackUper
import os, sys, tarfile
import datetime
from optparse import OptionParser
class Except(Exception):
pass
class Packer(Except):
def __init__(self):
self.__backup_dest = os.getenv('HOME')
__current_time = datetime.datetime.today().strftime('%Y-%m-%d
%H:%M:%S')
Except.__init__(self)
def doc_note(self):
print
DOCUMENTATION
'Backuper' is a script for doing backups.
You can backup with it single files or whole directories.
For available commands type 'backuper.py -h' or 'backuper.py
--help'.
Using it is simple:
- to backup single file, type:
'backuper.py -f FILE_PATH BCKP_NAME [DEST_PATH]',
where 'FILE_PATH' is exact path to prefered file which you
want to backup and 'BCKP_NAME' is the name for backup output file.
Default 'DEST_PATH' is placed in home directory, it can't be changed.
'BCKP_NAME' must be given;
- to backup whole directory, type:
'backuper.py -d DIR_PATH BCKP_NAME [DEST_PATH]', where
'DIR_PATH' is exact path to prefered directory, which you want to
backup and 'BCKP_NAME' is the name for backup output file. Default
'DEST_PATH' is placed in home directory, it can't be changed.
'BCKP_NAME' must be given;
def __check_set_perm(self, rd_obj_path, backup_dest):
try:
if os.path.exists(rd_obj_path):
if not os.access(rd_obj_path, os.R_OK):
print Have no permissions on [%s] for reading
operation.\nTrying to set them... % os.path.split(rd_obj_path)[1]
if not os.path.isdir(rd_obj_path):
os.chmod(rd_obj_path, stat.S_IREAD)
else:
for root, dirs, files in os.walk(rd_obj_path):
for f in files:
os.chmod(os.path.join(root, f),
stat.S_IREAD)
print Get permissions for reading on [%s]
successfully. % os.path.split(rd_obj_path)[1]
else:
print Have permissions on [%s] for reading. %
os.path.split(rd_obj_path)[1]
if not os.access(backup_dest, os.W_OK):
print Have no permissions on [%s] for writing
operation.\nTrying to set them... % os.path.split(backup_dest)[1]
os.chmod(backup_dest, stat.S_IWRITE)
print Get permissions for reading on [%s]
successfully. % os.path.split(backup_dest)[1]
else:
print Have permissions on [%s] for writing. %
os.path.split(backup_dest)[1]
else:
return Can't find specified path - [%s]. % rd_obj_path
sys.exit(1)
except (Except), ex:
return ex
def backup_file(self, rd_obj_path, bkp_obj_name):
try:
if os.name == nt:
rd_obj_path = rd_obj_path.replace('~/', '%s\\' %
os.getenv('HOME')).replace('\\', '')
backup_dest = self.__backup_dest
print Checking permissions for reading and writing...
self.__check_set_perm(rd_obj_path, backup_dest)
backup_obj = tarfile.open(%s\\%s(%s).tar.bz2 %
(backup_dest, bkp_obj_name, __current_time), 'w:bz2')
else:
rd_obj_path = rd_obj_path.replace('~/', '%s/' %
os.getenv('HOME'))
backup_dest = self.__backup_dest
print Checking permissions for reading and writing...
self.__check_set_perm(rd_obj_path, backup_dest)
backup_obj = tarfile.open(%s/%s(%s).tar.bz2 %
(backup_dest,
Re: Urllib2 not working
On Sat, Aug 22, 2009 at 2:12 PM, Carlos Fabian
Ramirezcarlosfabianrami...@gmail.com wrote:
Hello,
When I try to open a URL using urllib2.urlopen it returns Name or service
not known. It is not a problem with my Internet I believe, since I have
Internet access on my computer, and I have verified it is not a syntax, or
spelling, error on my part. I have also tried accessing the site
(google.com) by IP like so:
urllib2.urlopen('http://74.125.67.100/')
but this does not work either.
This is a traceback of an attempt to access it through its URL
(http://www.google.com/)
http://dpaste.com/84016/
Any help would be very appreciated.
Try googling the error message Name or service not known and urllib2.
HTH
--
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Re: TypeError while checking for permissions with os.access() on windows xp
WTF??
Why on IDLE it works, but when i run this script in cmd.exe, the
os.getenv('HOME') goes NoneType?
I'm to newbie yet to understand this :/
HOME is simply not a standard environment variable that Windows provides.
Any program can set/add environment variables as it deems fit; in this case
it seems IDLE is setting one, but you can't rely on it outside of IDLE.
If you do os.environ[HOMEDRIVE] + os.environ[HOMEPATH] it may be what
you want.
Start up cmd.exe, type 'set' -- that's the default/standard environment
variables you have to work with. That's it.
--S
--
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Re: difference between raw_input() and input()
if you prefix number with zero, it will turn into octal number... I too wasn't aware of it... at least in python :/ http://en.wikipedia.org/wiki/Octal It seems like bad practice to put zeroes before any decimal number in any language :) Juraj -- http://mail.python.org/mailman/listinfo/python-list
Re: sed/awk/perl: How to replace all spaces each with an underscore that occur before a specific string ?
bolega wrote:
sed/awk/perl:
Better to post in the sed or perl mailing lists rather than a
Python list. I saw an awk solution flew by.
How to replace all spaces each with an underscore that occur
before a specific string ?
I really prefer a sed one liner.
Here's a one-liner sed solution:
sed '/to /{s//\n/;h;s/.*\n//;x;s/\n.*//;s/ /_/g;G;s/\n//}'
There's a reason I prefer Python for these sorts of things:
readability! You win 5 free internets (as a stand-in for the
real life you clearly don't have) if you can decipher that in
under 20 seconds ;-)
expecting-to-see-NO CARRIER-after-typing-that'ly yers,
-tkc
+++ATH0
--
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Re: Using 'apply' as a decorator, to define constants
21-08-2009 o 18:09:02 alex23 wuwe...@gmail.com wrote:
Unfortunately, apply() has been removed as a built-in in 3.x.
You can always implement it yourself :)
def apply(function, args=(), keywords={}):
return function(*args, **keywords)
--
Jan Kaliszewski (zuo) z...@chopin.edu.pl
--
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Re: Questions on XML
Should I help you? If you answered my questions I am differing from your view I do not get any problem in processing Hindi or Bangla or any Indian language in Python it is perfectly fine. Best Regards, Subhabrata. On Sat, Aug 22, 2009 at 9:48 AM, Rami Chowdhury rami.chowdh...@gmail.comwrote: I am using primarily UTF-8 based strings, like Hindi or Bengali. Can I use Python to help me in this regard? I can say from experience that Python on Windows (at least, Python 2.5 on 32-bit Vista) works perfectly well with UTF-8 files containing Bangla. I have had trouble with working with the data in IDLE, however, which seems to prefer ASCII by default. - Rami Chowdhury Never assume malice when stupidity will suffice. -- Hanlon's Razor 408-597-7068 (US) / 07875-841-046 (UK) / 0189-245544 (BD) On Aug 21, 2009, at 19:15 , joy99 wrote: Dear Group, I like to convert some simple strings of natural language to XML. May I use Python to do this? If any one can help me, on this. I am using primarily UTF-8 based strings, like Hindi or Bengali. Can I use Python to help me in this regard? How can I learn good XML aspects of Python. If any one can kindly name me a book or URL. I am using Python2.6 on Windows XP with IDLE as GUI. Best Regards, Subhabrata. -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: Annoying octal notation
22-08-2009 o 21:04:17 Derek Martin c...@pizzashack.org wrote: On Sat, Aug 22, 2009 at 10:03:35AM +1000, Ben Finney wrote: These human programmers, whether newbies or long-experienced, also deal with decimal numbers every day, many of which are presented as a sequence of digits with leading zeros — and we continue to think of them as decimal numbers regardless. Having the language syntax opposed to that is ...consistent with virtually every other popular programming language. Probably not every other... Anyway -- being (as it was said) inconsistent with every-day-convention -- it'd be also inconsistent with *Python* conventions, i.e.: 0x - hex prefix 0b - bin prefix Cheers, *j -- Jan Kaliszewski (zuo) z...@chopin.edu.pl -- http://mail.python.org/mailman/listinfo/python-list
Re: string literal vs string variable
Kee Nethery k...@kagi.com (KN) wrote: KN On Aug 22, 2009, at 3:32 AM, Stefan Behnel wrote: You can use both, but I suspect parsing from StringIO to be slower than parsing from the string directly. That's the case for lxml, at least. Note that fromstring() behaves the same as XML(), but it reads better when parsing from a string variable. XML() reads better when parsing from a literal string. KN I'm not sure I know the difference between a string variable and a literal KN string. Is the difference as simple as: KN somestring = u'stuffhello world/stuff' KN fromstring(somestring) -- string variable KN vs KN XML(u'stuffhello world/stuff') -- literal string Yes. Stefan probably means `looks better for the human reader' when he says `reads better'. XML and fromstring are just different names for the same function. -- Piet van Oostrum p...@cs.uu.nl URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4] Private email: p...@vanoostrum.org -- http://mail.python.org/mailman/listinfo/python-list
Re: sed/awk/perl: How to replace all spaces each with an underscore that occur before a specific string ?
22-08-2009 o 20:11:32 bolega gnuist...@gmail.com wrote: sed/awk/perl: How to replace all spaces each with an underscore that occur before a specific string ? $ rm -rf /home/bolega ; python -c 'for i in xrange(1000): print I will never crosspost senselessly.' ;~] -- Jan Kaliszewski (zuo) z...@chopin.edu.pl -- http://mail.python.org/mailman/listinfo/python-list
Re: Questions on XML
On Aug 22, 12:16 pm, Rami Chowdhury rami.chowdh...@gmail.com wrote: encoding declaration to the top of your source file if you use encoded literal strings in your code Any tips for how to set the encoding in IDLE? printing the Unicode strings works -- trying to repr() the variable chokes with a UnicodeDecodeError, and trying to enter the literals inside IDLE just gets me '?' characters instead. (this is Python 2.5 + IDLE installed from the Python-2.5.msi on python.org) - Rami Chowdhury Never assume malice when stupidity will suffice. -- Hanlon's Razor 408-597-7068 (US) / 07875-841-046 (UK) / 0189-245544 (BD) On Aug 21, 2009, at 22:53 , Stefan Behnel wrote: Rami Chowdhury wrote: I am using primarily UTF-8 based strings, like Hindi or Bengali. Can I use Python to help me in this regard? I can say from experience that Python on Windows (at least, Python 2.5 on 32-bit Vista) works perfectly well with UTF-8 files containing Bangla. I have had trouble with working with the data in IDLE, however, which seems to prefer ASCII by default. Defaults almost never work for encodings. You have to be explicit: add an encoding declaration to the top of your source file if you use encoded literal strings in your code; use the codecs module with a suitable encoding to read encoded text files, and use an XML parser when reading XML. Stefan -- http://mail.python.org/mailman/listinfo/python-list- Hide quoted text - - Show quoted text - Dear Sir, There is no big issue for this. I simply downloaded Python2.5 and using IDLE on Windows XP with service pack 2. I used Python 2.5 earlier and presently using Python 2.6 and it is also perfectly fine. I am not using it for small programs but machine learning programs, where code itself runs few million lines over some terabytes of Hindi and Bengali data, and I never found any problem. What is the exact nature of problem you are getting? If you can kindly specify. If possible, with some sample codes. And printing is also never been a problem, all good printers like HP,Epson,Xerox,Canon are printing Hindi or Bengali data finely. If you can kindly specify the problem. Best Regards, Subhabrata. -- http://mail.python.org/mailman/listinfo/python-list
Re: string literal vs string variable
22-08-2009 o 19:46:51 Kee Nethery k...@kagi.com wrote: I'm not sure I know the difference between a string variable and a literal string. Is the difference as simple as: somestring = u'stuffhello world/stuff' fromstring(somestring) -- string variable vs XML(u'stuffhello world/stuff') -- literal string Yes, simply: s = 'hello world' #^ #it is a *string literal* s # - it is a *string object* #(or rather a name referring to it :-)) (In Python we have rather 'names' than 'variables', though -- as a mental leap -- they are commonly referred to as 'variables', regarding other languages' terminology). Cheers, *j -- Jan Kaliszewski (zuo) z...@chopin.edu.pl -- http://mail.python.org/mailman/listinfo/python-list
ANN: mock 0.6.0, Python mocking and testing library
mock is a Python mock object library for testing, with additional support for runtime monkey patching. Most mocking libraries follow the ‘record - replay’ pattern of mocking. I prefer the ‘action - assertion’ pattern, which is more readable and intuitive; particularly when working with the Python unittest module. This release, version 0.6.0, is a minor release but with a few new features: * mock homepage http://www.voidspace.org.uk/python/mock/ * download http://www.voidspace.org.uk/downloads/mock-0.6.0.zip * PDF documentation http://www.voidspace.org.uk/downloads/mock.pdf * Google code project and SVN repository http://code.google.com/p/mock/ New in 0.6.0: * New test layout compatible with test discovery * Descriptors (static methods / class methods etc) can now be patched and restored correctly * Mocks can raise exceptions when called by setting side_effect to an exception class or instance * Mocks that wrap objects will not pass on calls to the underlying object if an explicit return_value is set -- http://mail.python.org/mailman/listinfo/python-list
Re: logging SMTPhandler Error
On Aug 21, 8:34 am, Bev in TX countryon...@yahoo.com wrote:
Hi,
I've done some Python programming, but I still consider myself a
Python newbie. I have a Mac Pro OS X 10.5.8 system and I installed
Python 2.6.2 (the latest package available for the Mac) yesterday.
I was working through Matt Wilson's article on using the logging
module:http://blog.tplus1.com/index.php/2007/09/28/the-python-logging-module...
(If that does not work, then try:http://tinyurl.com/5v2lcy)
Everything worked great until his last example. My ISP does not
provide e-mail, so I tried using gmail in the line that sets h2. I
substituted mailid for my actual e-mail address in the following
examples; in my test I used my actual e-mail ID. Also, I used the
full path to the newly installed Python 2.6.2; otherwise it picked up
the older Python 2.5:
#!/Library/Frameworks/Python.framework/Versions/2.6/bin/python
First attempt:
h2 = logging.handlers.SMTPHandler('smtp.gmail.com', 'mai...@gmail.com',
['mai...@gmail.com'],'ERROR log')
However, that caused the following error to be issued:
Traceback (most recent call last):
File /Library/Frameworks/Python.framework/Versions/2.6/lib/
python2.6/logging/handlers.py, line 868, in emit
smtp.sendmail(self.fromaddr, self.toaddrs, msg)
File /Library/Frameworks/Python.framework/Versions/2.6/lib/
python2.6/smtplib.py, line 698, in sendmail
raise SMTPSenderRefused(code, resp, from_addr)
SMTPSenderRefused: (530, '5.7.0 Must issue a STARTTLS command first.
7sm3867994qwf.47', 'mai...@gmail.com')
I also tried providing my gmail userid/password, I tried adding a 5th,
credential, argument, which is a tupple, (username,password) (new in
2.6).
Second attempt:
h2 = logging.handlers.SMTPHandler('smtp.gmail.com', 'mai...@gmail.com',
['mai...@gmail.com'],'ERROR log',('mai...@gmail.com','gmail-
password'))
However, that caused the following error message:
Traceback (most recent call last):
File /Library/Frameworks/Python.framework/Versions/2.6/lib/
python2.6/logging/handlers.py, line 867, in emit
smtp.login(self.username, self.password)
File /Library/Frameworks/Python.framework/Versions/2.6/lib/
python2.6/smtplib.py, line 552, in login
raise SMTPException(SMTP AUTH extension not supported by
server.)
SMTPException: SMTP AUTH extension not supported by server.
I am able access gmail via Mac's Mail, in which it says that outgoing
mail is going to:
smtp.gmail.com:mailid
I tried using that as the server in the Python script, but it could
not find that server.
Is this possible? If I am doing something incorrectly, would someone
please indicate what it is?
Thanks,
Bev in TX
Today I tried this with both Python 2.6.2 and 3.1.1 on an XP system,
with the same error. For the 3.1.1 test, I had to change the syntax
of the exception from except exc, var to except exc as var. Here
is the modified script, with my email ID changed to mailid:
import logging
import logging.handlers
#Make a global logging object
x = logging.getLogger(logfun)
x.setLevel(logging.DEBUG)
#This handler writes out everything to stdout
h1 = logging.StreamHandler()
f = logging.Formatter(%(levelname)s %(asctime)s %(funcName)s %(lineno)
d %(message)s)
h1.setFormatter(f)
h1.setLevel(logging.DEBUG)
x.addHandler(h1)
#This handler emails me anything that is an error or worse
h2 = logging.handlers.SMTPHandler('smtp.gmail.com', 'mai...@gmail.com',
['mai...@gmail.com'],'ERROR log')
f = logging.Formatter(%(levelname)s %(asctime)s %(funcName)s %(lineno)
d %(message)s)
h2.setLevel(logging.ERROR)
h2.setFormatter(f)
x.addHandler(h2)
def g():
1 / 0
def f():
logfun = logging.getLogger(logfun)
logfun.debug(inside f!)
try:
g()
except Exception as ex:
logfun.exception(Something awful happened!)
logfun.debug(Finishing f!)
if __name__ == __main__:
f()
Thanks,
Bev in TX
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Re: TypeError while checking for permissions with os.access() on windows xp
WTF??
Why on IDLE it works, but when i run this script in cmd.exe, the
os.getenv('HOME') goes NoneType?
I'm to newbie yet to understand this :/
HOME is simply not a standard environment variable that Windows
provides. Any program can set/add environment variables as it deems
fit; in this case it seems IDLE is setting one, but you can't rely on
it outside of IDLE.
If you do os.environ[HOMEDRIVE] + os.environ[HOMEPATH] it may be
what you want.
Start up cmd.exe, type 'set' -- that's the default/standard
environment variables you have to work with. That's it.
--S
Yep, now that variable works fine. Thanks.
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Numeric literals in other than base 10 - was Annoying octal notation
On 22 Aug, 10:27, David 71da...@libero.it wrote: ... (snipped a discussion on languages and other systems interpreting numbers with a leading zero as octal) Either hexadecimal should have been 0h or octal should have been 0t :=) I have seen the use of Q/q instead in order to make it clearer. I still prefer Smalltalk's 16rFF and 8r377. Two interesting options. In a project I have on I have also considered using 0q as indicating octal. I maybe saw it used once somewhere else but I have no idea where. 0t was a second choice and 0c third choice (the other letters of oct). 0o should NOT be used for obvious reasons. So you are saying that Smalltalk has base in decimalrnumber where r is presumably for radix? That's maybe best of all. It preserves the syntactic requirement of starting a number with a digit and seems to have greatest flexibility. Not sure how good it looks but it's certainly not bad. 0xff 0x0e | 0b1101 16rff 16r0e | 2r1101 Hmm. Maybe a symbol would be better than a letter. ... Or Ada's16#FF#, 8#377#... I forget if DEC/VMS FORTRAN or Xerox Sigma FORTRAN used x'FF' or 'FF'x, and o'377' or '377'o ... What about 2_1011, 8_7621, 16_c26h or 2;1011, 8;7621, 16;c26h ? They look good - which is important. The trouble (for me) is that I want the notation for a new programming language and already use these characters. I have underscore as an optional separator for groups of digits - 123000 and 123_000 mean the same. The semicolon terminates a statement. Based on your second idea, though, maybe a colon could be used instead as in 2:1011, 8:7621, 16:c26b I don't (yet) use it as a range operator. I could also use a hash sign as although I allow hash to begin comments it cannot be preceded by anything other than whitespace so these would be usable 2#1011, 8#7621, 16#c26b I have no idea why Ada which uses the # also apparently uses it to end a number 2#1011#, 8#7621#, 16#c26b# Copying this post also to comp.lang.misc. Folks there may either be interested in the discussion or have comments to add. James -- http://mail.python.org/mailman/listinfo/python-list
Items inheriting attributes from its container?
I would like to create a list-like container class so that, additionally
to usual list methods, I could attach attributes to the container instances.
However, I would like it so that the items contained in the particular
instance of container somehow 'inherit' those attributes i.e.
cont = Container()
cont.color = 'blue'
cont.append(item)
print item.color
'blue'
The example appended below does that, but with the restriction that container
attributes must be set in the instantiation phase. This is actually fine
for me at the moment because my objects are read only, but I would
like to hear about better solutions, with more flexibility, please.
#-8
class Player:
Class for items
def __init__(self, playerdata, team):
self.data = playerdata
for key in team.__dict__:
setattr(self, key, team.__dict__[key])
return
class Team(list):
Class for containers
def __init__(self, teamdata, playerdata):
for key in teamdata:
setattr(self, key, teamdata[key])
for item in playerdata:
self.append(Player(item, self))
return
lakersdata = {'name' : 'Lakers', 'kitcolor' : 'yellow'}
lakersplayers = [['Kobe', 'PG', 12, 123], ['Kareem', 'FW', 23, 345]]
lakers = Team(lakersdata, lakersplayers)
# This is fine:
p1 = lakers[1]
print p1.kitcolor
# However the following doesn't work:
lakers.kitcolor = 'blue'
print p1.kitcolor
#-8
--
http://mail.python.org/mailman/listinfo/python-list
Re: line completion
On Thu, Aug 20, 2009 at 9:06 AM, Steven Woodynarkewo...@gmail.com wrote: Hi, I wrote a program that takes some user input. Many inputs are quit often used by user, so when a user launch the program, and type in The Sha, he wants to get wshank Redemption displayed automatically in reversed color (black text on white background) along his cursor. When he decided to use The Shawshank Redemption, he just press the enter key, otherwise, he type in other words anyway. My question is, is there any module that can easy the implementation of this feature? Thanks. The `readline` module in the standard library: http://docs.python.org/library/readline.html Although I don't know how to get it to colorize the interface. Cheers, Chris -- http://blog.rebertia.com -- http://mail.python.org/mailman/listinfo/python-list
Re: sed/awk/perl: How to replace all spaces each with an underscore that occur before a specific string ?
On Aug 22, 1:11 pm, bolega gnuist...@gmail.com wrote:
sed/awk/perl:
How to replace all spaces each with an underscore that occur before a
specific string ?
I really prefer a sed one liner.
Why?
Example
Input : This is my book. It is too thick to read. The author gets
little royalty but the publisher makes a lot.
Output: This_is_my_book._It_is_too__thick_to read. The author gets
little royalty but the publisher makes a lot.
We replaced all the spaces with underscores before the first occurence
of the string to .
No, you replaced all ... the string to (note the space).
awk '{idx=index($0,to ); tgt=substr($0,1,idx-1); gsub(/ /,_,tgt);
print tgt substr($0,idx)}' file
Ed.
--
http://mail.python.org/mailman/listinfo/python-list
Re: Items inheriting attributes from its container?
Kreso schrieb: I would like to create a list-like container class so that, additionally to usual list methods, I could attach attributes to the container instances. However, I would like it so that the items contained in the particular instance of container somehow 'inherit' those attributes i.e. The Python web application framework Zope implements the feature under the name acquisition. Happy Googling! Christian -- http://mail.python.org/mailman/listinfo/python-list
Re: Numeric literals in other than base 10 - was Annoying octal notation
James Harris wrote: I have no idea why Ada which uses the # also apparently uses it to end a number 2#1011#, 8#7621#, 16#c26b# Interesting. They do it because of this example from http://archive.adaic.com/standards/83rat/html/ratl-02-01.html#2.1: 2#1#E8-- an integer literal of value 256 where the E prefixes a power-of-2 exponent, and can't be taken as a digit of the radix. That is to say 16#1#E2 would also equal 256, since it's 1*16**2 . Mel. -- http://mail.python.org/mailman/listinfo/python-list
Re: Annoying octal notation
On Aug 22, 12:04 pm, Derek Martin c...@pizzashack.org wrote: On Sat, Aug 22, 2009 at 10:03:35AM +1000, Ben Finney wrote: These human programmers, whether newbies or long-experienced, also deal with decimal numbers every day, many of which are presented as a sequence of digits with leading zeros — and we continue to think of them as decimal numbers regardless. Having the language syntax opposed to that is ...consistent with virtually every other popular programming language. If you know anything about Python, you should know that consistent with virtually every other programming langauge is, at most, a polite suggestion for how Python should do it. Carl Banks -- http://mail.python.org/mailman/listinfo/python-list
Re: Items inheriting attributes from its container?
Kreso wrote:
I would like to create a list-like container class so that, additionally
to usual list methods, I could attach attributes to the container
instances. However, I would like it so that the items contained in the
particular instance of container somehow 'inherit' those attributes i.e.
cont = Container()
cont.color = 'blue'
cont.append(item)
print item.color
'blue'
The example appended below does that, but with the restriction that
container attributes must be set in the instantiation phase. This is
actually fine for me at the moment because my objects are read only, but
I would like to hear about better solutions, with more flexibility,
please.
#-8
class Player:
Class for items
def __init__(self, playerdata, team):
self.data = playerdata
for key in team.__dict__:
setattr(self, key, team.__dict__[key])
return
class Team(list):
Class for containers
def __init__(self, teamdata, playerdata):
for key in teamdata:
setattr(self, key, teamdata[key])
for item in playerdata:
self.append(Player(item, self))
return
lakersdata = {'name' : 'Lakers', 'kitcolor' : 'yellow'}
lakersplayers = [['Kobe', 'PG', 12, 123], ['Kareem', 'FW', 23, 345]]
lakers = Team(lakersdata, lakersplayers)
# This is fine:
p1 = lakers[1]
print p1.kitcolor
# However the following doesn't work:
lakers.kitcolor = 'blue'
print p1.kitcolor
#-8
I hope this gives you some good ideas.
http://en.wikipedia.org/wiki/Join_(SQL)
I suspect you will be finding a use for the special __getattr__ method,
which is called when an attribute is not found. This can be used to search
on your set of joined objects. Your list of joined objects should be a
set() to prevent duplicates.
--
Stephen Fairchild
--
http://mail.python.org/mailman/listinfo/python-list
Re: Annoying octal notation
On Aug 21, 12:48 pm, Derek Martin c...@pizzashack.org wrote: John Nagle wrote: Yes, and making lead zeros an error as suggested in PEP 3127 is a good idea. It will be interesting to see what bugs that flushes out. James Harris wrote: It maybe made sense once but this relic of the past should have been consigned to the waste bin of history long ago. Sigh. Nonsense. I use octal notation *every day*, for two extremely prevalent purposes: file creation umask, and Unix file permissions (i.e. the chmod() function/command). Unix file permissions maybe made sense once but this relic of the past should have been consigned to the waste bin of history long ago. :) Carl Banks -- http://mail.python.org/mailman/listinfo/python-list
Re: logging SMTPhandler Error
In article
c82d8338-c196-400a-9c09-c8f6dbc25...@l35g2000vba.googlegroups.com,
Bev in TX countryon...@yahoo.com wrote:
On Aug 21, 8:34 am, Bev in TX countryon...@yahoo.com wrote:
Hi,
I've done some Python programming, but I still consider myself a
Python newbie. I have a Mac Pro OS X 10.5.8 system and I installed
Python 2.6.2 (the latest package available for the Mac) yesterday.
I was working through Matt Wilson's article on using the logging
module:http://blog.tplus1.com/index.php/2007/09/28/the-python-logging-module
...
(If that does not work, then try:http://tinyurl.com/5v2lcy)
Everything worked great until his last example. My ISP does not
provide e-mail, so I tried using gmail in the line that sets h2. I
substituted mailid for my actual e-mail address in the following
examples; in my test I used my actual e-mail ID. Also, I used the
full path to the newly installed Python 2.6.2; otherwise it picked up
the older Python 2.5:
#!/Library/Frameworks/Python.framework/Versions/2.6/bin/python
First attempt:
h2 = logging.handlers.SMTPHandler('smtp.gmail.com', 'mai...@gmail.com',
['mai...@gmail.com'],'ERROR log')
However, that caused the following error to be issued:
Traceback (most recent call last):
File /Library/Frameworks/Python.framework/Versions/2.6/lib/
python2.6/logging/handlers.py, line 868, in emit
smtp.sendmail(self.fromaddr, self.toaddrs, msg)
File /Library/Frameworks/Python.framework/Versions/2.6/lib/
python2.6/smtplib.py, line 698, in sendmail
raise SMTPSenderRefused(code, resp, from_addr)
SMTPSenderRefused: (530, '5.7.0 Must issue a STARTTLS command first.
7sm3867994qwf.47', 'mai...@gmail.com')
The problem here is that gmail, like most modern mail services, requires
the use of an encrypted (SSL or TLS) connection for mail relaying so
that the required user name and password are not sent in the clear. The
logging SMTP handler uses the smtplib module from the standard module to
send mail and, when built properly, smtplib does support TLS. However,
the caller of smtplib does need to do some extra work in that case, i.e.
it needs to call the server object's starttls method at the right point
in the protocol handshaking. It's currently not done automatically in
smtplib and, unfortunately, there is no code in the logging smtp handler
to detect the need for and to call starttls (in response to a
250-STARTTLS response to an EHLO).
To make this work, either the logging module or, perhaps better, the
smptlib module needs to be smarter about this case. I didn't see an
open issue on the Python bug tracker about this; you might want to open
one. In the meantime, some options would be to find an SMTP mail host
that doesn't require TLS. Or write a custom logger. Or on OS X it's
not *too* difficult to set up a local host mailer using the
Apple-supplied prefix that would accept mail locally and forward it to a
more sophisticated remote mailer.
--
Ned Deily,
n...@acm.org
--
http://mail.python.org/mailman/listinfo/python-list
Re: sed/awk/perl: How to replace all spaces each with an underscore that occur before a specific string ?
bolega wrote: sed/awk/perl: How to replace all spaces each with an underscore that occur before a specific string ? I really prefer a sed one liner. Example Input : This is my book. It is too thick to read. The author gets little royalty but the publisher makes a lot. Output: This_is_my_book._It_is_too__thick_to read. The author gets little royalty but the publisher makes a lot. We replaced all the spaces with underscores before the first occurence of the string to . $ perl -le' $x = This is my book. It is too thick to read. The author gets little royalty but the publisher makes a lot.; print $x; $x =~ /to / substr( $x, 0, $-[0] ) =~ tr/ /_/; print $x; ' This is my book. It is too thick to read. The author gets little royalty but the publisher makes a lot. This_is_my_book._It_is_too__thick_to read. The author gets little royalty but the publisher makes a lot. John -- Those people who think they know everything are a great annoyance to those of us who do.-- Isaac Asimov -- http://mail.python.org/mailman/listinfo/python-list
Re: sed/awk/perl: How to replace all spaces each with an underscore that occur before a specific string ?
John W. Krahn wrote: bolega wrote: sed/awk/perl: How to replace all spaces each with an underscore that occur before a specific string ? I really prefer a sed one liner. Example Input : This is my book. It is too thick to read. The author gets little royalty but the publisher makes a lot. Output: This_is_my_book._It_is_too__thick_to read. The author gets little royalty but the publisher makes a lot. We replaced all the spaces with underscores before the first occurence of the string to . $ perl -le' $x = This is my book. It is too thick to read. The author gets little royalty but the publisher makes a lot.; print $x; $x =~ /to / substr( $x, 0, $-[0] ) =~ tr/ /_/; print $x; ' This is my book. It is too thick to read. The author gets little royalty but the publisher makes a lot. This_is_my_book._It_is_too__thick_to read. The author gets little royalty but the publisher makes a lot. If you're interested in a Python regex solution: s = This is my book. It is too thick to read. The author gets little royalty but the publisher makes a lot. s = re.sub(.*?(?=to ), lambda m: m.group().replace( , _), s) -- http://mail.python.org/mailman/listinfo/python-list
Re: logging SMTPhandler Error
On Aug 22, 7:07 pm, Ned Deily n...@acm.org wrote: The problem here is that gmail, like most modern mail services, requires the use of an encrypted (SSL or TLS) connection for mail relaying so that the required user name and password are not sent in the clear. The logging SMTP handler uses the smtplib module from the standard module to send mail and, when built properly, smtplib does support TLS. However, the caller of smtplib does need to do some extra work in that case, i.e. it needs to call the server object's starttls method at the right point in the protocol handshaking. It's currently not done automatically in smtplib and, unfortunately, there is no code in the logging smtp handler to detect the need for and to call starttls (in response to a 250-STARTTLS response to an EHLO). To make this work, either the logging module or, perhaps better, the smptlib module needs to be smarter about this case. I didn't see an open issue on the Python bug tracker about this; you might want to open one. In the meantime, some options would be to find an SMTP mail host that doesn't require TLS. Or write a custom logger. Or on OS X it's not *too* difficult to set up a local host mailer using the Apple-supplied prefix that would accept mail locally and forward it to a more sophisticated remote mailer. -- Ned Deily, n...@acm.org- Hide quoted text - - Show quoted text - Thanks for the excellent and informative response :-). I'll investigate further, as you suggested, now that I understand what is happening. Bev in TX -- http://mail.python.org/mailman/listinfo/python-list
Re: Items inheriting attributes from its container?
23-08-2009 Kreso kkumernott...@thatfamoussearchenginesmail.com wrote:
I would like to create a list-like container class so that, additionally
to usual list methods, I could attach attributes to the container
instances.
However, I would like it so that the items contained in the particular
instance of container somehow 'inherit' those attributes i.e.
cont = Container()
cont.color = 'blue'
cont.append(item)
print item.color
'blue'
[snip]
class Player:
Class for items
def __init__(self, playerdata, team):
self.data = playerdata
for key in team.__dict__:
setattr(self, key, team.__dict__[key])
return
class Team(list):
Class for containers
def __init__(self, teamdata, playerdata):
for key in teamdata:
setattr(self, key, teamdata[key])
for item in playerdata:
self.append(Player(item, self))
return
lakersdata = {'name' : 'Lakers', 'kitcolor' : 'yellow'}
lakersplayers = [['Kobe', 'PG', 12, 123], ['Kareem', 'FW', 23, 345]]
lakers = Team(lakersdata, lakersplayers)
[snip]
p1 = lakers[1]
print p1.kitcolor
[snip]
lakers.kitcolor = 'blue'
print p1.kitcolor
[Not tested. I believe that the idea is clear]
class RecruitmentError(ValueError):
Raised when a player cannot be recruited.
class Player(object):
A potential item of a Team() instance.
def __init__(self, playerdata, team=None):
self.data = playerdata
self.team = None
if team:
team.append(self)
# (called when the usual attribute lookup didn't succeed)
def __getattr__(self, name):
return getattr(self.team, name)
# ^ the last method may not be necessary -- you can always
# access to team data via 'team' attribute
# (and 'explicit is better than implicit')
class Team(list):
A container for Player() instances.
def __init__(self, teamdata, playerdata=None):
for key in teamdata:
setattr(self, key, teamdata[key])
for data in playerdata:
self.append(Player(data))
def _validate_and_get(self, index=None, player=None):
if player is not None and not isinstance(player, Player):
raise TypeError('A Player instance is required')
if index is not None:
if isinstance(index, slice):
raise TypeError('Slicing is not allowed')
return self[index] # (raise IndexError for bad index)
_validate = _validate_and_get
def _recruit(self, player):
if player.team is None:
player.team = self
else:
raise RecruitmentError('Player %s has already recruited')
def _dismiss(self, player):
player.team = None
def __setitem__(self, index, player):
current = self._validate_and_get(index, player)
if player is not current:
self._recruit(player)
self._dismiss(current)
list.__setitem__(self, index, player)
def __delitem__(self, index):
player = self._validate_and_get(index)
self._dismiss(player)
list.__delitem__(self, index)
def append(self, player):
self._validate(player=player)
self._recruit(player)
list.append(self, player)
# and similarly:
# * def extend...
# * def insert...
# * def pop...
# * def remove...
...if you really need ordered container (reflecting functions/hierarchy
of players in a team?).
Otherwise, as Stephen noted, you should subclass set rather than list.
Cheers,
*j
--
Jan Kaliszewski (zuo) z...@chopin.edu.pl
--
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Re: Items inheriting attributes from its container?
PS. Erratum: class Team(list): A container for Player() instances. def __init__(self, teamdata, playerdata=None): *** Here should be added: list.__init__(self) *** for key in teamdata: setattr(self, key, teamdata[key]) for data in playerdata: self.append(Player(data)) -- Jan Kaliszewski (zuo) z...@chopin.edu.pl -- http://mail.python.org/mailman/listinfo/python-list
Re: your favorite debugging tool?
Esmail ebo...@hotmail.com writes: What is your favorite tool to help you debug your code? A “print” statement (or equivalent, like logging output). I've been getting along with 'print' statements but that is getting old and somewhat cumbersome. Whenever a simple output statement is too cumbersome for debugging, I take it as a sign that the program is too cumbersome to follow. My debugging questions at that point are best taken to the unit test suite: record the questions and the expected answers, so that in the future anyone can get the benefit of them in a repeatable and automated fashion. -- \ “The power of accurate observation is frequently called | `\cynicism by those who don't have it.” —George Bernard Shaw | _o__) | Ben Finney -- http://mail.python.org/mailman/listinfo/python-list
Re: logging SMTPhandler Error
In article 87236fb1-c09f-46e8-8492-514ba000c...@24g2000yqm.googlegroups.com, Bev in TX countryon...@yahoo.com wrote: On Aug 22, 7:07 pm, Ned Deily n...@acm.org wrote: [...] Or on OS X it's not *too* difficult to set up a local host mailer using the Apple-supplied prefix that would accept mail locally and forward it to a more sophisticated remote mailer. Um, notation fail: s/prefix/Postfix/ -- Ned Deily, n...@acm.org -- http://mail.python.org/mailman/listinfo/python-list
Re: Annoying octal notation
On Sat, Aug 22, 2009 at 02:55:51AM +, Steven D'Aprano wrote: I can see how 012 can be confusing to new programmers, but at least it's legible, and the great thing about humans is that they can be taught (usually). And the great thing is that now you get to teach yourself to stop writing octal numbers implicitly and be write them explicitly with a leading 0o instead :) Sorry, I don't write them implicitly. A leading zero explicitly states that the numeric constant that follows is octal. It is so in 6 out of 7 computer languages I have more than a passing familiarity with (the 7th being scheme, which is a thing unto itself), including Python. It's that way on Bourne-compatible and POSIX-compatible Unix shells (though it requires a leading backslash before the leading zero there). I'm quite certain it can not be the case on only those 6 languages that I happen to be familiar with... While it may be true that people commonly write decimal numbers with leading zeros (I dispute even this, having to my recollection only recently seen it as part of some serial number, which in practice is really more of a string identifier than a number, often containing characters other than numbers), it's also true that in the context of computer programming languages, for the last 40+ years, a number represented with a leading zero is most often an octal number. This has been true even in Python for nearly *twenty years*. Why the sudden need to change it? So no, I don't get to teach myself to stop writing octal numbers with a leading zero. Instead, I have to remember an exception to the rule. Also I don't think it's exactly uncommon for computer languages to do things differently than they are done in non-CS circles. A couple of easy examples: we do not write x+=y except in computer languages. The POSIX system call to create a file is called creat(). If you think about it, I'm sure you can come up with lots of examples where even Python takes liberties. Is this a bad thing? Not inherently, no. Will it be confusing to people who aren't familiar with the usage? Quite possibly, but that is not inherently bad either. It's all about context. Use of octal isn't common. It's common enough. Peruse the include files for your C libraries, or the source for your operating system's kernel, or system libraries, and I bet you'll find plenty of octal. I did. [Note that it is irrelevant that these are C/C++ files; here we are only concerned with whether they use octal, not how it is represented therein.] I'd guess there's a fair chance that any math or scientific software package uses octal. Octal is a convenient way to represent bit fields that naturally occur in groups of 3, of which there are potentially limitless cases. You've given two cases were octal notation is useful, but for every coder who frequently writes umasks on Unix systems, there are a thousand who don't. I gave two cases that I use *daily*, or very nearly daily. My hats currently include system admin, SQA, and software development, and I find it convenient to use octal in each of those. But those are hardly the only places where octal is useful. Have a look at the ncurses library, for example. Given that Python has an ncurses interface, I'm guessing it's used there too. In fact if the Python source had no octal in it, I would find that very surprising. It's no hardship to write 0o12 instead of 012. Computer languages are not write-only, excepting maybe Perl. ;-) Writing 0o12 presents no hardship; but I assert, with at least some support from others here, that *reading* it does. -- Derek D. Martin http://www.pizzashack.org/ GPG Key ID: 0x81CFE75D pgp2DtXpzfNjd.pgp Description: PGP signature -- http://mail.python.org/mailman/listinfo/python-list
Re: Annoying octal notation
On Fri, Aug 21, 2009 at 04:23:57PM -0700, James Harris wrote: You misunderstand. I was saying that taking a leading zero as indicating octal is archaic. Octal itself is fine where appropriate. I don't see that the leading zero is any more archaic than the use of octal itself... Both originate from around the same time period, and are used in the same cases. We should just prohibit octal entirely then. But I suppose it depends on which definition of archaic you use. In the other common sense of the word, the leading zero is no more archaic than the C programming language. Let's ban the use of all three. :) (I believe C is still the language in which the largest number of lines of new code are written, but if not, it's way up there.) The chmod command doesn't require a leading zero. No, but it doesn't need any indicator that the number given to it is in octal; in the case of the command line tool, octal is *required*, and the argument is *text*. However, the chmod() system call, and the interfaces to it in every language I'm familiar with that has one, do require the leading zero (because that's how you represent octal). Including Python, for some 20 years or so. -- Derek D. Martin http://www.pizzashack.org/ GPG Key ID: 0x81CFE75D pgpf8DJDYdSjx.pgp Description: PGP signature -- http://mail.python.org/mailman/listinfo/python-list
Re: Numeric literals in other than base 10 - was Annoying octal notation
On Sat, 22 Aug 2009 14:54:41 -0700 (PDT), James Harris james.harri...@googlemail.com wrote: On 22 Aug, 10:27, David 71da...@libero.it wrote: ... (snipped a discussion on languages and other systems interpreting numbers with a leading zero as octal) Either hexadecimal should have been 0h or octal should have been 0t :=3D) I have seen the use of Q/q instead in order to make it clearer. I still prefer Smalltalk's 16rFF and 8r377. Two interesting options. In a project I have on I have also considered using 0q as indicating octal. I maybe saw it used once somewhere else but I have no idea where. 0t was a second choice and 0c third choice (the other letters of oct). 0o should NOT be used for obvious reasons. So you are saying that Smalltalk has base in decimalrnumber where r is presumably for radix? That's maybe best of all. It preserves the syntactic requirement of starting a number with a digit and seems to have greatest flexibility. Not sure how good it looks but it's certainly not bad. I opine that a letter is better; special characters are a valuable piece of real estate. However for floating point you need at least three letters because a floating point number has three parts: the fixed point point, the exponent base, and the exponent. Now we can represent the radices of the individual parts with the 'r'scheme, e.g., 2r101001, but we need separate letters to designate the exponent base and the exponent. B and E are the obvious choices, though we want to be careful about a confusion with 'b' in hex. For example, using 'R', 3R20.1B2E16Rac is 20.1 in trinary (6 1/3) times 2**172 (hex ac). I grant that this example looks a bit gobbledegookish, but normal usage would be much simpler. The notation doesn't handle balanced trinary; however I opine that balanced trinary requires special notation. Richard Harter, c...@tiac.net http://home.tiac.net/~cri, http://www.varinoma.com No one asks if a tree falls in the forest if there is no one there to see it fall. -- http://mail.python.org/mailman/listinfo/python-list
Re: Annoying octal notation
On Sat, 22 Aug 2009 14:04:17 -0500, Derek Martin wrote: These human programmers, whether newbies or long-experienced, also deal with decimal numbers every day, many of which are presented as a sequence of digits with leading zeros — and we continue to think of them as decimal numbers regardless. Having the language syntax opposed to that is ...consistent with virtually every other popular programming language. A mistake is still a mistake even if it shared with others. Treating its with a lead zero as octal was a design error when it was first thought up (possibly in C?) and it remains a design error no matter how many languages copy it. I feel your pain of having to unlearn something you have learned, but just because you have been lead astray by the languages you use doesn't mean we should compound the error by leading the next generation of coders astray too. Octal is of little importance today, as near as I can tell it only has two common uses in high level languages: file umasks and permissions on Unix systems. It simply isn't special enough to justify implicit notation that surprises people, leads to silent errors, and is inconsistent with standard mathematical notation and treatment of floats: 123.2000 # insignificant trailing zeroes don't matter 123.2 000123.2 # neither do insignificant leading zeroes 123.2 001.23e0023 # not even if it is an integer 1.23e+23 000123 # but here is matters 83 -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Idle does not recognize PYTHONPATH
Hi, Idle does not recognize PYTHONPATH set in .bashrc. Starting Python shell in the terminal sys.path shows the PYTHONPATH, but again not shown in IDLE. This is a common problem but I could not find a fix. Using Ubuntu 9.04. Python 2.6. Thanks -- http://mail.python.org/mailman/listinfo/python-list
Re: How to 'de-slashify' a string?
Vlastimil Brom wrote:
2009/8/22 AK a...@nothere.com:
Vlastimil Brom wrote:
2009/8/22 AK a...@nothere.com:
Steven D'Aprano wrote:
On Sat, 22 Aug 2009 04:20:23 -0400, AK wrote:
Hi, if I have a string '\\303\\266', how can I convert it to '\303\266'
in a general way?
It's not clear what you mean.
Do you mean you have a string '\\303\\266', that is:
backslash backslash three zero three backslash backslash two six six
If so, then the simplest way is:
s = r'\\303\\266' # note the raw string
len(s)
10
print s
\\303\\266
print s.replace('', '\\')
\303\266
Another possibility:
s = '\\303\\266' # this is not a raw string
len(s)
8
print s
\303\266
So s is:
backslash three zero three backslash two six six
and you don't need to do any more.
Well, I need the string itself to become '\303\266', not to print
that way. In other words, when I do 'print s', it should display
unicode characters if my term is set to show them, instead of
showing \303\266.
The problem I'm running into is that I'm connecting with pygresql to a
postgres database and when I get fields that are of 'char' type, I get
them in unicode, but when I get fields of 'byte' type, I get the text
with quoted slashes, e.g. '\303' becomes '\\303' and so on.
Is pygresql quoting the backslash, or do you just think it is quoting
the
backslashes? How do you know? E.g. if you have '\\303', what is the
length
of that? 4 or 5?
Length is 4, and I need it to be length of 1. E.g.:
s = '\303'
s
'\xc3'
x = '\\303'
x
'\\303'
len(x)
4
len(s)
1
What I get from pygresql is x, what I need is s. Either by asking
pygresql
to do this or convert it afterwards. I can't do replace('\\303', '\303')
because it can be any unicode character.
--
AK
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Hi,
do you mean something like
u\u0303
u'\u0303'
print u\u0303
̃
̃ (dec.: 771) (hex.: 0x303) ̃ COMBINING TILDE (Mark, Nonspacing)
?
vbr
Yes, something like that except that it starts out as '\\303\\266', and it's
good enough for me if it turns into '\303\266', in fact that's rendered as
one unicode char. In other words, when you do:
print \\303\\266
'\303\266'
I need that result to become a python string, i.e. the slashes need to
be converted from literal slashes to escape slashes.
--
AK
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Not sure, whether it is the right way of handling the such text data, but maybe:
decoded = '\\303\\266'.decode(string_escape)
decoded
'\xc3\xb6'
print decoded
ö
print '\303\266'
ö
It might be an IDLE issue, but it still isn't one unicode glyph.
I guess, you have to ensure, that the input data is valid and the
right encoding is used.
hth
vbr
Actually, this works perfectly for me. It prints out as one character in
gnome-terminal and also when I write it to a text file, and open it as
utf-8 format in gnumeric, it also shows up properly.
Thanks to all who helped! -AK
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Re: How to create functors?
Steven D'Aprano ste...@remove.this.cybersource.com.au writes:
According to Wikipedia, functor can be used as a synonym for function
object: ... http://en.wikipedia.org/wiki/Function_object
Hmm, I hadn't seen that usage before. I guess there's no law against
it, but it seems a bit bogus to me.
I find the Haskell page entirely opaque and unintelligible... The
Wikipedia page is a little better
I thought it was the other way around, but I've been banging my head
against Haskell on and off for the past year or so, so it could be
that the Haskell page is more intelligible if the reader already has
some familiarity with Haskell and its type system.
Here's another attempt of my own, from the mathematical perspective:
categories generalize the concept of structured collections of
objects. For example, groups, rings, and sets are each a type of
structured collection, so there is a category of groups (called Grp
since for some reason categorists like to use capitalized, abbreviated
names), a category of rings (Rng), and a category of sets (Set).
Each category has a collection of objects and a collection of arrows
(sometimes called morphisms) which are associative relations between
objects in the category. So in the category of sets, the objects are
sets and the arrows are functions mapping one set to another. In the
category of groups, the objects are groups and the arrows are the
homeomorphisms between groups.
Functors are mappings from one category to another, that map both the
objects and the arrows. That is they are arrows on the categories of
categories.
The concepts of categories and functors came from the loftier reaches
of algebraic geometry (further in math than I ever got) in the 1950's
or so. These days they turn out to be useful in studying type systems
of programming languages, which is where most of my exposure to them
has come from.
But let me try an example to see if I've got it right:
class Int2StrFunctor:
def map1(self, n):
if type(n) is not int:
raise TypeError('argument must be an int')
I don't think this is right. A functor (in the PL sense that I've
been describing) acts on types, not on members of types. That is,
your example turns 3 into ---, i.e. it turns a member of type
int into a member of type str. A functor would be something that
acts on arbitrary types, e.g. one might turn int into array of
int, and str into array of str and so forth. Another might turn
int into red-black tree containing a pair of ints at each node and
doing something similar with str. The map1 and map2 functions (I
guess it is ok to call them that) are supposed to be generic.
I guess you could have a String functor whose map1 function is repr
and whose map2 functor is (lambda f: lambda x,f=f: repr(f(x))) or
something like that. It would transport every type to the str type.
There are some technical restrictions on functors, relating to the sorts
of functions and types (strictly categories) they can accept,
presumably to make them mathematically well-behaved.
Right.
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Re: logging SMTPhandler Error
In article mailman.251.1250986082.2854.python-l...@python.org, Ned Deily n...@acm.org wrote: Or on OS X it's not *too* difficult to set up a local host mailer using the Apple-supplied prefix that would accept mail locally and forward it to a more sophisticated remote mailer. It's also not too difficult to do the moral equivalent with dnspython and find the MX host for the domain you're trying to send e-mail to; that usually does not require an encrypted connection. -- Aahz (a...@pythoncraft.com) * http://www.pythoncraft.com/ I support family values -- Addams family values --www.nancybuttons.com -- http://mail.python.org/mailman/listinfo/python-list
[issue1170] shlex have problems with parsing unicode
Benjamin Peterson benja...@python.org added the comment: The patch needs tests before it can be applied. Additionally, I'm not sure if having a utf option is helpful. Is there a reason not to have unicode support by default? -- nosy: +benjamin.peterson ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue1170 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue6759] zipfile.ZipExtFile.read() is missing universal newline support
New submission from Ryan Leslie ryle...@gmail.com: The zipfile.ZipFile.open() behavior with mode 'U' or 'rU' is not quite as advertised in http://docs.python.org/library/zipfile.html#zipfile.ZipFile.open Here is an example: $ echo -ne This is an example\r\nWhich demonstrates a problem\r\nwith ZipFile.open(..., 'U')\r\n foo.txt $ cat -v foo.txt This is an example^M Which demonstrates a problem^M with ZipFile.open(..., 'U')^M $ zip foo.zip foo.txt adding: foo.txt (deflated 1%) $ python Python 2.6.2 (r262:71600, Aug 21 2009, 17:52:12) [GCC 4.1.2 20071124 (Red Hat 4.1.2-42)] on linux2 Type help, copyright, credits or license for more information. open(foo.txt, 'U').read() This is an example\nWhich demonstrates a problem\nwith ZipFile.open(..., 'U')\n from zipfile import ZipFile ZipFile(foo.zip).open(foo.txt, 'U').read() This is an example\r\nWhich demonstrates a problem\r\nwith ZipFile.open(..., 'U')\r\n The open() method was added here: http://bugs.python.org/issue1121142 The cause is that the universal newline implementation is specific to readline(), which also implements readlines() and next() as well. Support was never added for read(), which is independent. Note that test_zipfile.UniversalNewlineTests.readTest() passes. This is suspect because it's explicitly coded to *not* expect translation of new line sequences. -- components: Library (Lib) messages: 91854 nosy: ryles severity: normal status: open title: zipfile.ZipExtFile.read() is missing universal newline support versions: Python 2.6 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue6759 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue6508] expose setresuid
Amaury Forgeot d'Arc amaur...@gmail.com added the comment: Yes, just put it near the numerous set_XXXuid functions, protected with a HAVE_SETRESUID macro (you will have to modify configure.in as well) -- nosy: +amaury.forgeotdarc ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue6508 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue6239] c_char_p return value returns string, not bytes
kai zhu kaizhu...@gmail.com added the comment: wrote an extension application which relies on the patch (works after applying patch to python 3.1.1). it converts png images to colorized ascii-art on ansi-compatible terminal. requires the patch b/c a ctype function returns a c-string w/ ansi-escape characters. import ctypes lib = ctypes.cdll.LoadLibrary(_asciiporn.so) lib.img_read(bfoo.png) // load png image lib.asc_itp(4, 16) // ascii-rize algorithm lib.asc_str.restype = ctypes.c_char_p print( lib.asc_str() ) // prints out ansi-colorized ascii-art hopefully, this is more motivation to commit the patch to trunk -- Added file: http://bugs.python.org/file14768/_asciiporn.c ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue6239 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
