Learning Python: Code critique please
Hello all, I'm trying to learn various programming languages (I did MATLAB at uni), and have decided to start with Python. The programming exercises are derived from Larry O'brien's a href=http://www.knowing.net/ PermaLink,guid,f3b9ba36-848e-43f8-9caa-232ec216192d.aspx15 Programming Exercises /a. First one is up with a couple of comments of my own. Any suggestions, corrections, things that I have done wrong, could do better, etc, please feel free to post a comment. Timbo -- http://mail.python.org/mailman/listinfo/python-list
Re: An idiom for code generation with exec
d = {}
execcode in globals(), d
return d['foo']
My way:
return function(compile(code, 'string', 'exec'), globals())
With some help from the guys at IRC I came to realize your way doesn't
do the same. It creates a function that, when called, creates 'foo' on
globals(). This is not exactly what I need.
Eli
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Re: An idiom for code generation with exec
On Jun 20, 2:44 pm, Peter Otten [EMAIL PROTECTED] wrote:
eliben wrote:
Additionally, I've found indentation to be a problem in such
constructs. Is there a workable way to indent the code at the level of
build_func, and not on column 0 ?
execif 1: + code.rstrip()
Peter
Why is the 'if' needed here ? I had .strip work for me:
def make_func():
code =
def foo(packet):
return ord(packet[3]) + 256 * ord(packet[4])
d = {}
exec code.strip() in globals(), d
return d['foo']
Without .strip this doesn't work:
Traceback (most recent call last):
File exec_code_generation.py, line 25, in module
foo = make_func()
File exec_code_generation.py, line 20, in make_func
exec code in globals(), d
File string, line 2
def foo(packet):
^
IndentationError: unexpected indent
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Re: An idiom for code generation with exec
eliben wrote: On Jun 20, 2:44 pm, Peter Otten [EMAIL PROTECTED] wrote: eliben wrote: Additionally, I've found indentation to be a problem in such constructs. Is there a workable way to indent the code at the level of build_func, and not on column 0 ? execif 1: + code.rstrip() Peter Why is the 'if' needed here ? I had .strip work for me: A simple .strip() doesn't work if the code comprises multiple lines: def f(): ... return ... x = 42 ... if x 0: ... print x ... ... exec if 1:\n + f().rstrip() 42 exec f().strip() Traceback (most recent call last): File stdin, line 1, in module File string, line 2 if x 0: ^ IndentationError: unexpected indent You can of course split the code into lines, calculate the indentation of the first non-white line, remove that indentation from all lines and then rejoin. Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: An idiom for code generation with exec
On Jun 21, 8:52 am, Peter Otten [EMAIL PROTECTED] wrote: eliben wrote: On Jun 20, 2:44 pm, Peter Otten [EMAIL PROTECTED] wrote: eliben wrote: Additionally, I've found indentation to be a problem in such constructs. Is there a workable way to indent the code at the level of build_func, and not on column 0 ? execif 1: + code.rstrip() Peter Why is the 'if' needed here ? I had .strip work for me: A simple .strip() doesn't work if the code comprises multiple lines: def f(): ... return ... x = 42 ... if x 0: ... print x ... ... exec if 1:\n + f().rstrip() 42 exec f().strip() Traceback (most recent call last): File stdin, line 1, in module File string, line 2 if x 0: ^ IndentationError: unexpected indent I see. In my case I only evaluate function definitions with 'exec', so I only need to de-indent the first line, and the others can be indented because they're in a new scope anyway. What you suggest works for arbitrary code and not only function definitions. It's a nice trick with the if 1: :-) -- http://mail.python.org/mailman/listinfo/python-list
Re: Weird local variables behaviors
I see, intuitively one would think it would try to get it from global
context as it's not yet bound in the local.
Thanks for the explanation.
Sebastjan
On Sat, Jun 21, 2008 at 5:48 AM, Dan Bishop [EMAIL PROTECTED] wrote:
On Jun 20, 7:32 pm, Matt Nordhoff [EMAIL PROTECTED] wrote:
Sebastjan Trepca wrote:
Hey,
can someone please explain this behavior:
The code:
def test1(value=1):
def inner():
print value
inner()
def test2(value=2):
def inner():
value = value
inner()
test1()
test2()
[EMAIL PROTECTED] ~/dev/tests]$ python locals.py
1
Traceback (most recent call last):
File locals.py, line 13, in module
test2()
File locals.py, line 10, in test2
inner()
File locals.py, line 9, in inner
value = value
UnboundLocalError: local variable 'value' referenced before assignment
Why can't he find the variable in the second case?
Thanks, Sebastjan
Python doesn't like when you read a variable that exists in an outer
scope, then try to assign to it in this scope.
(When you do a = b, b is processed first. In this case, Python
doesn't find a value variable in this scope, so it checks the outer
scope, and does find it. But then when it gets to the a = part...
well, I don't know, but it doesn't like it.)
In a language like C++, the scope of a variable is determined by the
declaration.
int x; // A
class Example
{
int x; // B
void f()
{
int x; // C
x = 42; // Which x?
}
};
The x referred to in the statement x = 42; refers to local
variable of Example::f. If line C were removed, then it would refer
to the member variable of class Example. And if line B were removed,
then it would refer to the global variable.
In Python, however, there are no declarations. Therefore, it requires
another approach. What it chose was:
(1) Explicit self for object attributes.
(2) A function's local variables are defined as those appearing on the
left side of an assignment. Whether the name happens to refer to a
global is NOT considered.
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Re: Python is behavior
On Jun 21, 2:14 am, Gary Herron [EMAIL PROTECTED] wrote: [EMAIL PROTECTED] wrote: On Jun 20, 9:38 am, Jean-Paul Calderone [EMAIL PROTECTED] wrote: On Fri, 20 Jun 2008 09:31:57 -0700 (PDT), [EMAIL PROTECTED] wrote: I am not certain why this is the case, but... a = 256 b = 256 a is b True a = 257 b = 257 a is b False Can anyone explain this further? Why does it happen? 8-bit integer differences? http://mail.python.org/pipermail/python-list/2001-November/113994.html Jean-Paul Thank you for this Jean-Paul. I did know about the identity of objects, but my curiosity is based on the 256 number. Are the 2^8 integers cached due to the internal loops, or is there any other specific reason? Is this something that can be controlled? Python provides no way to change that number, but of course you can always fiddle with the source code and recompile. The actual value is a trade off (like any caching scheme) of cache-space versus efficiency gains. The value has changed at least once in recent versions of Python. And if your code breaks because of this, don't whine, 'cause you've already been warned not to rely on it. Exactly the same arguments with other people that is/going to whine because they break the encapsulation. -- http://mail.python.org/mailman/listinfo/python-list
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exec with custom dict
Hi, I am trying to use exec with custom dict. I am trying to print the value of variable x in 2 places. It is printing it at the first place and failing at the second place. class Env(dict): def __getitem__(self, key): return self.get(key, key) code = print x def f(): return x env = Env() exec(code, env) print env['f']() Here is the output I'm getting. x Traceback (most recent call last): File a.py, line 14, in module print env['f']() File string, line 3, in f NameError: global name 'x' is not defined Can somebody explain me what is happening? -Anand -- http://mail.python.org/mailman/listinfo/python-list
How to convert a into a
Hello All, In a wx GUI, I would like to let the user choose between , or =. So, I created a combobox and when the user chooses for instance, I wanted to return (the objective is to send the operator into another complex method): Example: if variable == : return But this is invalid syntax. How can I transform a into the operator ie without parenthesis, so that I can load it into another function ? Thanks in advance Dominique -- http://mail.python.org/mailman/listinfo/python-list
Re: How to convert a into a
On Jun 21, 9:17 pm, dominique [EMAIL PROTECTED] wrote:
Hello All,
In a wx GUI, I would like to let the user choose between , or =.
So, I created a combobox and when the user chooses for instance, I
wanted to return (the objective is to send the operator into another
complex method):
Example:
if variable == :
return
But this is invalid syntax.
How can I transform a into the operator ie without parenthesis,
so that I can load it into another function ?
Look at the operator module. In your above example:
return {
'': operator.gt,
'=': operator.eq,
'': operator.lt,
}[variable]
Cheers,
John
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would you want to buy cheap something?welcome to www.wholenikee.cn -- http://mail.python.org/mailman/listinfo/python-list
Fast and easy GUI prototyping with Python
Which tools would you use? I want the interface design to be as easy and fast as possible, all ideology aside. I'm considering either IronPython+Visual Studio or Python+Qt -- but I'm open for other suggestions. Visual Studio seems to offer the easiest solution, but is IronPython stable enough? How easy is the IronPython/Visual Studi integration? What about IronPython Studio? -- http://mail.python.org/mailman/listinfo/python-list
Re: An idiom for code generation with exec
On Jun 21, 2:02 pm, eliben [EMAIL PROTECTED] wrote: On Jun 21, 8:52 am, Peter Otten [EMAIL PROTECTED] wrote: eliben wrote: On Jun 20, 2:44 pm, Peter Otten [EMAIL PROTECTED] wrote: eliben wrote: Additionally, I've found indentation to be a problem in such constructs. Is there a workable way to indent the code at the level of build_func, and not on column 0 ? execif 1: + code.rstrip() Peter Why is the 'if' needed here ? I had .strip work for me: A simple .strip() doesn't work if the code comprises multiple lines: def f(): ... return ... x = 42 ... if x 0: ... print x ... ... exec if 1:\n + f().rstrip() 42 exec f().strip() Traceback (most recent call last): File stdin, line 1, in module File string, line 2 if x 0: ^ IndentationError: unexpected indent I see. In my case I only evaluate function definitions with 'exec', so I only need to de-indent the first line, and the others can be indented because they're in a new scope anyway. What you suggest works for arbitrary code and not only function definitions. It's a nice trick with the if 1: :-) Have you actually profiled your code? Or are you just basing this assumptions on guesses? -- http://mail.python.org/mailman/listinfo/python-list
Re: Fast and easy GUI prototyping with Python
[EMAIL PROTECTED] [EMAIL PROTECTED]: Which tools would you use? I want the interface design to be as easy and fast as possible, all ideology aside. I'm considering either IronPython+Visual Studio or Python+Qt -- but I'm open for other suggestions. I'm using the latter, and am perfectly happy with a combination of Qt Designer as GUI editor and emacs as code editor. -- Freedom is always the freedom of dissenters. (Rosa Luxemburg) -- http://mail.python.org/mailman/listinfo/python-list
Re: How to convert a into a
On Jun 21, 1:37 pm, John Machin [EMAIL PROTECTED] wrote:
Look at the operator module. In your above example:
return {
'': operator.gt,
'=': operator.eq,
'': operator.lt,
}[variable]
Cheers,
John
Thanks a lot John
Dominique
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Way to unblock sys.stdin.readline() call
HI, Is there any possible way to unblock the sys.stdin.readline() call from a different thread. Something like sys.stdin.write() but that would actually work ... something to put characters in the stdin... Thanks in advance, João -- http://mail.python.org/mailman/listinfo/python-list
Re: An idiom for code generation with exec
I see. In my case I only evaluate function definitions with 'exec', so I only need to de-indent the first line, and the others can be indented because they're in a new scope anyway. What you suggest works for arbitrary code and not only function definitions. It's a nice trick with the if 1: :-) Have you actually profiled your code? Or are you just basing this assumptions on guesses? First of all, I see absolutely no connection between your question and the text you quote. Is there? Or did you pick one post randomly to post your question on? Second, yes - I have profiled my code. Third, this is a very typical torture path one has to go through when asking about code generation. It is true of almost all communities, except Lisp, perhaps. You have to convince everyone that you have a real reason to do what you do. The simple norm of getting a reply to your question doesn't work when you get to code generation. I wonder why is it so. How many people have been actually burned by bad code generation techniques, and how many are just parroting goto is evil because it's the accepted thing to say. This is an interesting point to ponder. Eli -- http://mail.python.org/mailman/listinfo/python-list
Re: Fast and easy GUI prototyping with Python
On Jun 21, 3:36 pm, [EMAIL PROTECTED] wrote: Which tools would you use? I want the interface design to be as easy and fast as possible, all ideology aside. I'm considering either IronPython+Visual Studio or Python+Qt -- but I'm open for other suggestions. Visual Studio seems to offer the easiest solution, but is IronPython stable enough? How easy is the IronPython/Visual Studi integration? What about IronPython Studio? I've had success using wxPython in conjunctin with wxGlade. wxGlade is quite flexible, allows quick previews and generates code that's not bad. The wxPython binding is very well supported and works nicely in practice. And, best of all, this solution is both free and completely cross-platform. Eli -- http://mail.python.org/mailman/listinfo/python-list
Getting column names from a cursor using ODBC module?
Is there any way to retrieve column names from a cursor using the ODBC module? Or must I, in advance, create a dictionary of column position and column names for a particular table before I can access column values by column names? I'd prefer sticking with the ODBC module for now because it comes standard in Python. I'm using Python 2.4 at the moment. Thanks. -- http://mail.python.org/mailman/listinfo/python-list
sys.settrace 'call' event behavior
I'm building a tool to trace all function calls using sys.settrace
function from the standard library. One of the awkward behaviors of
this facility is that the class definitions are reported as 'call'
events.[1] Since I don't want to catch class definitions, only
function calls, I'm looking for a way to differentiate between those
two. So far I have only vague clues about how to do that.
At the bottom of this mail is a simple script that prints all
attributes (except for the bytecode) of the traced code. In the sample
code Bar class is defined and foo function is called after that. The
following trace output is reported:
Bar, 0, 0, (), (), (), (None,), ('__name__', '__module__', 'None'),
foo.py, 21, , 1, 66
foo, 0, 0, (), (), (), (None,), (), foo.py, 25, , 1, 67
Class definition and function call differs on four attributes. Two of
them, co_name and co_firstlineno are not very helpful. Other two are
co_names and co_flags. The latter differs only by the CO_OPTIMIZED
flag, which is for internal use only[2]. So we're left with
co_names, which is a tuple containing the names used by the
bytecode. Is that helpful in distinguishing between class definitions
and function calls? Do you have any other ideas on how to tell them
apart?
Source of the sample script I used follows.
def trace(frame, event, arg):
if event == 'call':
print ', '.join(map(str, [frame.f_code.co_name,
frame.f_code.co_argcount,
frame.f_code.co_nlocals,
frame.f_code.co_varnames,
frame.f_code.co_cellvars,
frame.f_code.co_freevars,
frame.f_code.co_consts,
frame.f_code.co_names,
frame.f_code.co_filename,
frame.f_code.co_firstlineno,
frame.f_code.co_lnotab,
frame.f_code.co_stacksize,
frame.f_code.co_flags]))
return trace
import sys
sys.settrace(trace)
class Bar(object):
None
pass
def foo():
pass
foo()
[1] It is strange for me, but documented properly.
http://docs.python.org/lib/debugger-hooks.html says that call event
happens when a function is called (or some other code block
entered).
[2] http://docs.python.org/ref/types.html#l2h-145
Cheers,
mk
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Re: Getting column names from a cursor using ODBC module?
On Jun 21, 11:58 pm, [EMAIL PROTECTED] wrote: Is there any way to retrieve column names from a cursor using the ODBC module? Or must I, in advance, create a dictionary of column position and column names for a particular table before I can access column values by column names? I'd prefer sticking with the ODBC module for now because it comes standard in Python. I'm using Python 2.4 at the moment. Thanks. -- http://mail.python.org/mailman/listinfo/python-list
Re: Getting column names from a cursor using ODBC module?
On Jun 21, 11:58 pm, [EMAIL PROTECTED] wrote: Is there any way to retrieve column names from a cursor using the ODBC module? Or must I, in advance, create a dictionary of column position and column names for a particular table before I can access column values by column names? I'd prefer sticking with the ODBC module for now because it comes standard in Python. I'm using Python 2.4 at the moment. Do you mean the odbc module? If so, it doesn't come standard in Python; it's part of the win32 package. I haven't used it for years -- my preference on Windows these days would be mxODBC if the client would pay the licence fee, otherwise pyodbc. Sorry I'm not answering your question ... perhaps you should be asking a different question :) Cheers, John -- http://mail.python.org/mailman/listinfo/python-list
Re: Getting column names from a cursor using ODBC module?
On Jun 22, 12:19 am, John Machin [EMAIL PROTECTED] wrote: On Jun 21, 11:58 pm, [EMAIL PROTECTED] wrote: Is there any way to retrieve column names from a cursor using the ODBC module? Or must I, in advance, create a dictionary of column position and column names for a particular table before I can access column values by column names? I'd prefer sticking with the ODBC module for now because it comes standard in Python. I'm using Python 2.4 at the moment. Do you mean the odbc module? If so, it doesn't come standard in Python; it's part of the win32 package. I haven't used it for years -- my preference on Windows these days would be mxODBC if the client would pay the licence fee, otherwise pyodbc. Sorry I'm not answering your question ... perhaps you should be asking a different question :) Cheers, John But to help you answer your question: if the module that you are using supports the 2.0 version of the database API (see http://www.python.org/dev/peps/pep-0249/), then it will support the cursor.description attribute, which gives you not only the name but the type and 5 other bits of info about each column. If it doesn't, I'd suggest moving on. HTH, John -- http://mail.python.org/mailman/listinfo/python-list
Re: Fast and easy GUI prototyping with Python
On 21 июн, 15:36, [EMAIL PROTECTED] wrote: Which tools would you use? I want the interface design to be as easy and fast as possible, all ideology aside. I'm considering either IronPython+Visual Studio or Python+Qt -- but I'm open for other suggestions. Visual Studio seems to offer the easiest solution, but is IronPython stable enough? How easy is the IronPython/Visual Studi integration? What about IronPython Studio? Use PyQt. You will gain great portability +all the functionality built in qt. You can try PyGTK also, though i wont recommend it. -- http://mail.python.org/mailman/listinfo/python-list
Re: An idiom for code generation with exec
On Jun 21, 9:40 am, eliben [EMAIL PROTECTED] wrote: I see. In my case I only evaluate function definitions with 'exec', so I only need to de-indent the first line, and the others can be indented because they're in a new scope anyway. What you suggest works for arbitrary code and not only function definitions. It's a nice trick with the if 1: :-) Have you actually profiled your code? Or are you just basing this assumptions on guesses? First of all, I see absolutely no connection between your question and the text you quote. Is there? Or did you pick one post randomly to post your question on? Second, yes - I have profiled my code. Third, this is a very typical torture path one has to go through when asking about code generation. It is true of almost all communities, except Lisp, perhaps. You have to convince everyone that you have a real reason to do what you do. The simple norm of getting a reply to your question doesn't work when you get to code generation. I wonder why is it so. How many people have been actually burned by bad code generation techniques, and how many are just parroting goto is evil because it's the accepted thing to say. This is an interesting point to ponder. It's not as much that many people have been burned but that, like goto, 99% of the time there are better alternatives. Off the top of my head, two recurring threads in c.l.py related to dynamic code generation and evaluation are: - Asking how to dynamically generate variable names (for i in xrange(10): exec 'x%d = %d' % (i,i)) instead of using a regular dictionary. - Using function names instead of the actual function objects and calling eval(), not knowing that functions are first-class objects (or not even familiar with what that means). So even if your use case belongs to the exceptional 1% where dynamic code generation is justified, you should expect people to question it by default. George -- http://mail.python.org/mailman/listinfo/python-list
Re: advanced listcomprehenions?
Terry Reedy [EMAIL PROTECTED] wrote: The lookup table is a constant. If made a tuple, it will be compiled as a constant (as least in 2.6, maybe 2.5). Force of habit. I tend to work on lists by indexing and/or iterating, and on tuples by destructuring, and choose types based on the kinds of things I'll be doing. But I did intentionally ensure that the tables were constant so that readers could apply the obvious optimization if they wanted. (Also, unnecessarily computing str(i) seemed bad.) In any case, it could (and to me should) be lifted out of the string comp. For performance, yes. But doing a modexp is going to kill performance anyway, so I decided to save screen lines. After all, applying even fairly basic number theory to a problem like this isn't really what one might call a readable solution. ;-) -- [mdw] -- http://mail.python.org/mailman/listinfo/python-list
Re: optparse functionality missing
Jeff Keasler [EMAIL PROTECTED] wrote: In a scripting environment, I often want to strip some of the command line options off the argument list, and then pass the remaining options to another module that is deeper in the tool chain. The difficulty is that you can't do an accurate parse without knowing which options take arguments. For example, what are the options here? foo -xyzzy -abcdef -ghi -ghi -g -hi Well, `-z', `-f' and `-g' take arguments; the `-g' argument is optional. So the correct options to pass along are -x -y -zzy -a -b -c -d -e -f-ghi -ghi -g -h -i Not so obvious, is it? ;-) -- [mdw] -- http://mail.python.org/mailman/listinfo/python-list
mod_wsgi vs mod_python interfaces
Hi list, I remember red into this list that mod_wsgi is more faster than mod_python. Why ? WSIG it's only a true specification for deploy and performance Python applications running into web servers, mod python it's like mod wsgi but it's only a not official specification between Apache and Python aplications or frameworks. Therefore the real difference between both module are a kind of protocol/interface for talk with Python Aplication. mod_wsgi and mod_python are written in C and only how their internal data structures and memory managment and other issues can justify a different performance. Or WSGI interface it's more efficient than mod_python interface ? What do you think about this ? -- Pau Freixes Linux GNU/User -- http://mail.python.org/mailman/listinfo/python-list
Re: Way to unblock sys.stdin.readline() call
Le Saturday 21 June 2008 15:26:53 joamag, vous avez écrit : HI, Is there any possible way to unblock the sys.stdin.readline() call from a different thread. Something like sys.stdin.write() but that would actually work ... something to put characters in the stdin... Do you mean setting stdin in non-blocking mode ? On unix you can do it with the fcntl module (you'll find more infos in the libc docs) : fcntl.fcntl(sys.stdin, fcntl.F_SETFL, os.O_NONBLOCK) and catch IOErrors with errno = EAGAIN. But I don't know how to do it in a portable way, suggestions welcome :) -- Cédric Lucantis -- http://mail.python.org/mailman/listinfo/python-list
Re: Python is behavior
For some reason, stacking multiple statements reuses the same object. Each code object has a co_consts tuple referring to all constants used in the code. The compiler interns duplicate constants for a single compiler run, resulting in the same object being used when the code is put into a single line (or in a function, or module). When the code is split into multiple interactive statements, the compiler runs multiple times, and doesn't know anything about past runs. Regards, Martin -- http://mail.python.org/mailman/listinfo/python-list
Re: Fast and easy GUI prototyping with Python
On Jun 21, 1:36 pm, [EMAIL PROTECTED] wrote: Which tools would you use? I want the interface design to be as easy and fast as possible, all ideology aside. I'm considering eitherIronPython+Visual Studio or Python+Qt -- but I'm open for other suggestions. Visual Studio seems to offer the easiest solution, but isIronPython stable enough? How easy is theIronPython/Visual Studi integration? What aboutIronPythonStudio? IronPython 1 is very stable. IronPython 2 is still in beta. The IronPython 1 and Visual Studio 2005 integration (via the SDK) is pretty good. Personally I think IronPython Studio is a bit immature - and I don't like the way it generates Python code anyway. The Windows Forms designer in Visual Studio is pretty good. Unfortunately better than most GUI designers available for other Python compatible toolkits. I still don't like the designer for creating UIs with fluid layouts - I don't think it handles them very well. In my opinion, the best way to use the designer is to actually generate C# rather than IronPython code. You can then subclass from IronPython and implement the programmed behaviour - using the designer only for the UI layout. Windows Forms is very cross platform now with Mono. Mono now has full coverage of the .NET 2.0 winforms APIs. Michael Foord http://www.ironpythoninaction.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: urllib (54, 'Connection reset by peer') error
Tim Golden wrote: [EMAIL PROTECTED] wrote: Thanks for the help. The error handling worked to a certain extent but after a while the server does seem to stop responding to my requests. I have a list of about 7,000 links to pages I want to parse the HTML of (it's basically a web crawler) but after a certain number of urlretrieve() or urlopen() calls the server just stops responding. Anyone know of a way to get around this? I don't own the server so I can't make any modifications on that side. I think someone's already mentioned this, but it's almost certainly an explicit or implicit throttling on the remote server. If you're pulling 7,000 pages from a single server you need to be sure that you're within the Terms of Use of that service, or at the least you need to contact the maintainers in courtesy to confirm that this is acceptable. If you don't you may well cause your IP block to be banned on their network, which could affect others as well as yourself. Interestingly, lp.findlaw.com doesn't have any visible terms of service. The information being downloaded is case law, which is public domain, so there's no copyright issue. Some throttling and retry is needed to slow down the process, but it should be fixable. Try this: put in the retry code someone else suggested. Use a variable retry delay, and wait one retry delay between downloading files. Whenever a download fails, double the retry delay and try again; don't let it get bigger than, say, 256 seconds. When a download succeeds, halve the retry delay, but don't let it get smaller than 1 second. That will make your downloader self-tune to the throttling imposed by the server. John Nagle -- http://mail.python.org/mailman/listinfo/python-list
Re: Strange re problem
On Jun 20, 3:35 pm, Paul McGuire [EMAIL PROTECTED] wrote: On Jun 20, 6:01 am, TYR [EMAIL PROTECTED] wrote: Thank you very much. This pyparsing module looks damned useful. -- http://mail.python.org/mailman/listinfo/python-list
Re: Fast and easy GUI prototyping with Python
Thanks for your input. The prototype will be running on Windows only. Portability and being able to develop on other platforms would be a bonus, but is not a requirement. I guess the choice is going to be between Visual Studio and Qt. Of importance is: 1) Being able to develop and change (dummy) GUI prototypes very fast, i.e. drag and drop. I've tried Visual Studio's form designer -- it seems quite capable. Don't know about Qt's designer -- is it as easy and fast to use? 2) The Qt vs. .NET API. I have no experience with Qt's API and a rudimentary experience with the .NET API (seems powerfull but also big and complex). Michael: Interesting suggestion to just subclass C#, maybe that's the way to go. -- http://mail.python.org/mailman/listinfo/python-list
install py2exe in vista
I want to install it in vistahttp://www.daniweb.com/forums/thread130469.html#, but i get this message in the process: could not create... py2exe-py2.5 I press 'OK', then.. could not set key value python 2.5 py2exe-0.6.8 I press 'OK' again, then... could not set key value c:\Python25\Removepy2exe.exe -u c:\python25\py2exe-wininst.log The installation goes on and do something, run some postinstall script. I thought it should be ok, but i fail even creating a simple hello word exe. I get this message after i run python setup.py install: running install running build running install_egg_info Writing c:\Python25\Lib\site-packages\UNKNOWN-0.0.0-py2.5-egg-info No output is created. Can I anyone help me with this? http://www.addthis.com/bookmark.php http://www.daniweb.com/forums/editpost.php?do=editpostp=631985 -- http://mail.python.org/mailman/listinfo/python-list
Unbuffered stdout/auto-flush
Hi, is there any way to get unbuffered stdout/stderr without relying on the -u flag to python or calling .flush() on each print (including indirect hacks like replacing sys.stdout with a wrapper that succeeds each write() with a flush())? Thanks in advance! -- Yang Zhang http://www.mit.edu/~y_z/ -- http://mail.python.org/mailman/listinfo/python-list
SSL
Hi, Is it possible to access a https site using a certificate and keeping the session alive like it happens in the browsers? I'm doing a command line app that needs to access a https site to retrieve information but using the httplib, each time i make a request it asks for the pem pass phrase. Thanks, Ricardo -- http://mail.python.org/mailman/listinfo/python-list
passing control to other window
i am trying to develop a application using Tkinter in which a new window pops out on a particular button press.though i can pass control automatically to that window using .force_focus() method and disabling all my widgets in previous window but the technique is not so clean. for eg. when u click 'save' a window pops out asking for location but u can still close your previous window using the 'cross-mark' on top right corner with save window still open. can anyone help me out! -- http://mail.python.org/mailman/listinfo/python-list
Re: Way to unblock sys.stdin.readline() call
On Jun 21, 4:46 pm, Cédric Lucantis [EMAIL PROTECTED] wrote: Le Saturday 21 June 2008 15:26:53 joamag, vous avez écrit : HI, Is there any possible way to unblock the sys.stdin.readline() call from a different thread. Something like sys.stdin.write() but that would actually work ... something to put characters in the stdin... Do you mean setting stdin in non-blocking mode ? On unix you can do it with the fcntl module (you'll find more infos in the libc docs) : fcntl.fcntl(sys.stdin, fcntl.F_SETFL, os.O_NONBLOCK) and catch IOErrors with errno = EAGAIN. But I don't know how to do it in a portable way, suggestions welcome :) -- Cédric Lucantis Thanks for the advice that's a way of solving my problem, but I really need a portable way of doing it... The application I’m build is meant to be run in more platforms than Unix ... so I really need a portable way of doing that or something else that unblocks the read call in the stdin -- http://mail.python.org/mailman/listinfo/python-list
Re: Welho luopunut TF-boxin markkinoinnista.
01.05.2008 Jää historian kirjoihin erityispäivämääränä josta alkaa ydinalan vaikeudet kasautumaan aivan erityisesti myös Suomessa. Jo siitä asti kun puollisentoista vuotta sitten Krister Fuuglesangin NASA:n avaruusionisaatioraportin tiedot maapalloa kohtaavasta vääjäämättömästä ydinvoimapäästöjen megatuhosta vuodettiin maailman päättäjille ydinalan alasajon välttämättömyys on ollut tiedossa. Samasta pohjasta jopa IPCC ennakoi koko ilmastojärjestelmän tuhoa 10v sisällä. Mutta toukokuusta alkaa myös tietomuruja mainiyusta maailmanhistorian suurimmasta ydinkatastrofitulemisesta vuotaa, esim. kauttani viimein suuren kansanmassan tietoisuuteen. Mistä tarkemmin on kyse. Maailman metastabiilinen perustaustataso on 10-kertaistunut totaalisen tuhoisaan suuntaansa romahdellen. Luonto itsessään viestittää katastrofaalisista mehiläistuhoviesteistä ja vastaavantyyppisistä ydinkampamaneetti-invaasioista kiihtyvästi. Einsteinin 5v mehiläishäviämisnäytöistä ennakoima ionosfäärituho on vyöryämässä kaikin merkein ihmiskunnan kohtaloksi. Onnistuin saamaan ydinalan silkaksi kauhuksi YVA 4/TEM tiedostoihin maininnat siitä, että tulevat sukupolvet voivat myös arkistofaktojen perusteella tuomita nykyiset ydintoimitsijat, firmat ja päättäjät ydinalan kansainväliseen Nyyrbergin oikeudenkäyntiin päättäjiemme nyttemmin kiistatta tietämistä rikoksistaan ihmiskuntaa vastaan. Niin pitkälle on prosessi edennyt, että Sisäministeriö jo panikoi tämän tulevan faktan tietäen! YLE-teksti-TV kirjoitti, miten vähin äänin oli muutettu maamme lakia rajusti: Rikoksista ihmisyyttä vastaan on toimeenpantu lakimuutos 01.05 lukien, että jatkossa henkilöitä, ryhmiä ja teollisuuslaitoksia jne. jotka tuomitaan erittäin raskauttavista (ydin) ja sotatoimista kansaansa vastaan ja rikoksista ihmisyyttä vastaan ei voida tuomita Suomesta kansainvälisiin Haagin tuomioistuimiin saamaan jopa kuolemantuomioitaan. Vaan jopa näin rajuista rikoksista langetetaan korkeintaan Suomen lainsäädännöllä paikan päällä maksimirangaistukseksi rajaten vain elinkautisiksi! Siis huh, hu alkaa ydinherrojemme polvet tutista alati kasvavien ydinrikosilmitulojen paineissa! Ilmankos Heiniluoma sanoi, ettei Suomeen TVO:n kaavailemia isotooppilaitostartteja ja ydinvoimaloittemme keskeisiä plutoniumpoltto-oikeuksia, uraanikaivosmassiiveineen ja ydinjätekäsittelyineen EU:sta kiirehditä. Vaan oltiin yht äkkiä sitä mieltä, ettei edes seuraavakaan hallitus tunke kokoomuksen/TVO/Posiva:n suunnattomaksi mieliharmiksi lupaa hakien kansantahtoa vastaan edellämainittuihin NATOn hyväksymiin-optiotoimiin. 02.04-08. Uutiset kertoivat, että jälleen kerran oli Norjassa 200km Oslosta pohjoiseen Ottessa sortunut tektoniliikunnasta 300m pitkä ja 50m leveä kalliorinne ja allle oli hautautunut vähintään 150 hengen pakolaisvirran startanneen väestön kymmenet talot. Edellisestä tästä kuuluisasta 2500 km pitkästä Laatokka-Skotlantitektonisesta Litoraanisaumalikunnasta Olkiluodon läpi olimme saaneet viestejä Norjasta 5 hengen kuolemaepäilystä ja 7m liikuneesta vuorirojahduksesta kuukausi sitten. Päivän selvästi tämä kyseinen maailman syvin maanpäällinen tektonisauma on hurjasti aktivoitumassa. Niin ruotsalaisvoimalat, kuin Olkiluodon kaikki laittomasti mm. kallioon ankkuroidut ydinvoimalat tulevat liikuntojen murskaamina joutumaan suunnattomiin vaikeuksiin. 5cm/v liikuva sauma kun tuottaa jatkossa ruotsalaisopein huikeita mitattuja yli 8 Rihterin maanjäristyksiä! Edes vuoden takaista 450m kallioliikuntoa Ruotsissa saati saman aikaista 14 Norjan luolan tuhoa ei olla uskallettu tutkia julkisesti. Virannoimaisten panikointi muutti jo nyt koko Ruotsin tektonisaumaan ydinjätehautauskuviot totaalisesti syväporausmalleihinsa. Esimauksi myös Suomeen 10 kertaistuneine lisämaksuin turvarajamuutospakoin. Mutta kaikesta näkee, ettei luonto tähän tyydy, vaan pahentaa odotettaan alati! -- http://mail.python.org/mailman/listinfo/python-list
Re: String Concatenation O(n^2) (was: Re: Explaining Implementing a Binary Search Tree.)
On Jun 17, 1:01 am, Gabriel Genellina [EMAIL PROTECTED] wrote: En Mon, 16 Jun 2008 07:34:06 -0300, Bart Kastermans [EMAIL PROTECTED] escribió: Summary: can't verify big O claim, how to properly time this? This is interesting. I had never attempted to verify a big O statement before, and decided that it would be worth trying. So I wrote some code to collect data, and I can't find that it goes quadratic. In your test code, you're concatenating only two strings, that's a *single* operation, and takes time proportional to the total length. The quadratic behavior appears when you do *several* concatenations in a row (like in your original code, where += was used several times to build a result). If you want to verify it, try joining N strings of size M (for varying values of N and M), and plot total time vs. N (for a given M value), and total time vs. M (for a given N value) and finally total time vs. (N*M), see what happens and post your findings again. -- Gabriel Genellina I did the work and found that for trees it does not go quadratic at all, from the computations you suggest it is easy to get quadratic behavior though. Also this does not depend in any way I can see on the implementation by Python. Actual time might certainly improve by doing it differently (changing the constants), but the big O results won't. For pictures and math I have put it up on my blog again see: http://kasterma.wordpress.com/2008/06/21/complexity-of-string-concatenation-ii/ Thanks to everyone who commented so far on this subject. I had some good fun with it so far. Best, Bart -- http://mail.python.org/mailman/listinfo/python-list
Re: Getting column names from a cursor using ODBC module?
On Jun 21, 3:58 pm, [EMAIL PROTECTED] wrote: Is there any way to retrieve column names from a cursor using the ODBC module? Or must I, in advance, create a dictionary of column position and column names for a particular table before I can access column values by column names? I'd prefer sticking with the ODBC module for now because it comes standard in Python. I'm using Python 2.4 at the moment. Thanks. You should be able to do column_names = [d[0] for d in cursor.description] -- http://mail.python.org/mailman/listinfo/python-list
Re: Fast and easy GUI prototyping with Python
On Jun 21, 6:15 pm, [EMAIL PROTECTED] wrote: Thanks for your input. The prototype will be running on Windows only. Portability and being able to develop on other platforms would be a bonus, but is not a requirement. I guess the choice is going to be between Visual Studio and Qt. Of importance is: 1) Being able to develop and change (dummy) GUI prototypes very fast, i.e. drag and drop. I've tried Visual Studio's form designer -- it seems quite capable. Don't know about Qt's designer -- is it as easy and fast to use? 2) The Qt vs. .NET API. I have no experience with Qt's API and a rudimentary experience with the .NET API (seems powerfull but also big and complex). Michael: Interesting suggestion to just subclass C#, maybe that's the way to go. I found the Windows Forms APIs pretty straightforward. You can get a good introduction to the .NET APIs from IronPython in Action. ;-) Michael Foord http://www.ironpythoninaction.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Way to unblock sys.stdin.readline() call
On Sat, 21 Jun 2008 12:35:02 -0700 (PDT), joamag [EMAIL PROTECTED] wrote: On Jun 21, 4:46 pm, Cédric Lucantis [EMAIL PROTECTED] wrote: Le Saturday 21 June 2008 15:26:53 joamag, vous avez écrit : HI, Is there any possible way to unblock the sys.stdin.readline() call from a different thread. Something like sys.stdin.write() but that would actually work ... something to put characters in the stdin... Do you mean setting stdin in non-blocking mode ? On unix you can do it with the fcntl module (you'll find more infos in the libc docs) : fcntl.fcntl(sys.stdin, fcntl.F_SETFL, os.O_NONBLOCK) and catch IOErrors with errno = EAGAIN. But I don't know how to do it in a portable way, suggestions welcome :) -- Cédric Lucantis Thanks for the advice that's a way of solving my problem, but I really need a portable way of doing it... The application I’m build is meant to be run in more platforms than Unix ... so I really need a portable way of doing that or something else that unblocks the read call in the stdin Twisted supports asynchronous handling of stdin on both POSIX and Windows. See stdiodemo.py and stdin.py under the Miscellaenous section at http://twistedmatrix.com/projects/core/documentation/examples/ Jean-Paul -- http://mail.python.org/mailman/listinfo/python-list
Re: Sqlite3 textfactory and user-defined function
[EMAIL PROTECTED] wrote: I've run into a problem with text encoding in the Sqlite3 module. I think it may be a bug. By default sqlite3 converts strings in the database from UTF-8 to unicode. This conversion can be controlled by changing the connection's text_factory. I have a database that stores strings in 8-bit ISO-8859. So, I set the text_factory to do no conversion. In my database I use user defined functions. I noticed that even when I set text_factory = lambda x:x, it appears to do UTF-8 to unicode conversion on strings that are passed to my user defined function. [...] I've answered the same question on the pysqlite mailing list a few weeks back: Thread Trouble with create_function interface to sqlite http://itsystementwicklung.de/pipermail/list-pysqlite/2008-May/62.html -- Gerhard -- http://mail.python.org/mailman/listinfo/python-list
Re: Way to unblock sys.stdin.readline() call
joamag wrote: Is there any possible way to unblock the sys.stdin.readline() call from a different thread. If you want the thread to do something 'else' when no input is available, would this work? Put readline in a thread that puts lines in a q=queue.Quese(). Then try: l=q.ge_nowait process l except queue.Empty whatever without l -- http://mail.python.org/mailman/listinfo/python-list
trying to find a substring in a string
I'm trying to write what should be a simple script in Python, which I've never ever used before. Essentially, I have a text file that has a list of full path file names to other files, separated by carriage returns. Contents of first file: c:\blah.txt c:\blah1.txt c:\blah2.txt The goal is for the user to specify another file, and then search the specified file for instances of files from the first file. Contents of user specified file: file = c:\blah.txt file = c:\blah1.txt My goal is for the program to tell me that it found c:\blah.txt and c: \blah1.txt. I've read the contents of the existing file into an array, where each element is a line from the file. I did the same thing with the user specified file. I thought it would be a simple nested for loop to find them, but I'm having no luck finding the strings. The string find method doesn't do it for me. I've tried regular expressions, but it never finds a match. I think it doesn't like when I do re.compile(variableName), but without a debugger I have no way to tell what's going on at all. I keep telling myself this should be really simple, but I'm ready to jump out a window. Any help would be greatly appreciated. Thanks in advance. -- http://mail.python.org/mailman/listinfo/python-list
My n00bie brain hurts after Python setup.py install.
I downloaded Mark Pilgrims's feedparser.py in a zipfile to my Windows machine, unzipped it and tried to install it to no avail. Here is the result = C:\python c:\scripts\feedparser-4.1\setup.py install running install running build running build_py file feedparser.py (for module feedparser) not found running install_lib warning: install_lib: 'build\lib' does not exist -- no Python modules to install running install_egg_info Writing C:\Python25\Lib\site-packages\feedparser-4.1-py2.5.egg-info WTF? The file feedparser.py did exist in the same place as setup.py. Even if it works, what exactly does this setup.py do for me? If I just manually place feedparser.py in my Python site-packages file it works fine. As for that egg-info file, I googled python eggs and now I am really confused. -- http://mail.python.org/mailman/listinfo/python-list
Re: trying to find a substring in a string
[EMAIL PROTECTED] wrote:
I'm trying to write what should be a simple script in Python, which
I've never ever used before.
Essentially, I have a text file that has a list of full path file
names to other files, separated by carriage returns.
Contents of first file:
c:\blah.txt
c:\blah1.txt
c:\blah2.txt
The goal is for the user to specify another file, and then search the
specified file for instances of files from the first file.
Contents of user specified file:
file = c:\blah.txt
file = c:\blah1.txt
My goal is for the program to tell me that it found c:\blah.txt and c:
\blah1.txt.
I've read the contents of the existing file into an array, where each
element is a line from the file.
Put each stripped (to delete \n) line into a set. Then parse out the
filenames and check that they are in the set. Something like
def getname(line): whatever)
s=set(line.strip() for line in open('allfiles.txt', 'r'))
for line in open('paths.txt'):
if getname(line) not in s:
return '%s not found'%line
else:
return 'all found'
tjr
--
http://mail.python.org/mailman/listinfo/python-list
Re: Fast and easy GUI prototyping with Python
[EMAIL PROTECTED] wrote: 2) The Qt vs. .NET API. I have no experience with Qt's API and a rudimentary experience with the .NET API (seems powerfull but also big and complex). Qt's API is very very good. Easy to use and extremely powerful. Note that in Python a number of Qt's APIs are not used in favor of Python native apis for things like file and socket I/O, IPC, Threads, and so forth. Additionally, PyQT does allow you the flexibility to move to other platforms. That need may not exist for you now, but it never makes sense to me to needlessly lock yourself down. As far as GUI design goes, Qt and SWF would be on par, likely. It's a bit of a misnomer to be comparing Qt to the .NET API. In IronPython you can of course leverage all the class libraries in the CLR, but most python programmers prefer to use python native libraries wherever possible. If you follow that, then it's SWF that compares to Qt. I've not used VS 2008's SWF gui designer, but of all the designers I've seen so far, Qt's Designer is the best I've ever used. I don't ever use code generation (GUIs should be created from the XML definitions), so integration with an IDE is not a concern for me. One issue about Qt is licensing, which could completely kill it for you. Although technically PyQt would insulate you from this issue to a point, TrollTech will not license Qt for your use in a non-GPL project if you began developing the project using the GPL version of Qt. -- http://mail.python.org/mailman/listinfo/python-list
Python doc problem example: gzip module (reprise)
fileToCompress = open('finalcallejon.mb')
fileToStr = fileToCompress.read()
import gzip
fileZipped = gzip.GzipFile('finalcallejon.mb.gz', 'wb', 9)
fileZipped.write(fileToStr)
fileZipped.close()
this may help you in
http://mail.python.org/pipermail/python-list/2005-November/349718.html
have a nice day Emoticon1.gif--
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Re: My n00bie brain hurts after Python setup.py install.
On Jun 22, 9:05 am, [EMAIL PROTECTED] wrote: I downloaded Mark Pilgrims's feedparser.py in a zipfile to my Windows machine, unzipped it and tried to install it to no avail. Here is the result = C:\python c:\scripts\feedparser-4.1\setup.py install The convention is to run setup.py from the current directory, unless instructed otherwise; what did the package's readme say? Try: cd \scripts\feedparser-4.1 python setup.py install running install running build running build_py file feedparser.py (for module feedparser) not found running install_lib warning: install_lib: 'build\lib' does not exist -- no Python modules to install running install_egg_info Writing C:\Python25\Lib\site-packages\feedparser-4.1-py2.5.egg-info WTF? The file feedparser.py did exist in the same place as setup.py. Even if it works, what exactly does this setup.py do for me? If I just manually place feedparser.py in my Python site-packages file it works fine. In general, a setup.py install may do lots of things besides coping 1 file. Manually placing files in site-packages is not a good habit to get into. As for that egg-info file, I googled python eggs and now I am really confused. Eggs are part of a new experimental package distribution scheme. Don't worry about it. Cheers, John -- http://mail.python.org/mailman/listinfo/python-list
flock seems very unsafe, python fcntl bug?
I ran following 2 programs (lock1, lock2) at almost same time,
to write either 123456, or 222 to file aaa at the same time.
But I often just got 222456 in aaa .
Is this a bug of python fcntl module ? See 2 programs I ran:
#!/usr/bin/env python
import fcntl, time
file = open('aaa', w)
fcntl.flock(file, fcntl.LOCK_EX)
file.write('123456')
time.sleep(10)
file.close()
#!/usr/bin/env python
import fcntl, time
file = open('aaa', w)
fcntl.flock(file, fcntl.LOCK_EX)
file.write('222')
time.sleep(10)
file.close()
--
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Re: Unbuffered stdout/auto-flush
On Jun 21, 12:29 pm, Yang Zhang [EMAIL PROTECTED] wrote: Hi, is there any way to get unbuffered stdout/stderr without relying on the -u flag to python or calling .flush() on each print (including indirect hacks like replacing sys.stdout with a wrapper that succeeds each write() with a flush())? Thanks in advance! I think the only way is to reopen the stdout file descriptor: import sys import os # reopen stdout file descriptor with write mode # and 0 as the buffer size (unbuffered) sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 0) print unbuffered text Sebastian -- http://mail.python.org/mailman/listinfo/python-list
Connecting a Desktop App to a Web App
Okay, this is my first post to this mailing list, so first off if I shouldn't be sending something here, PLEASE correct me. Okay, so I want to create an app that has a GUI (most likely Tkinter) and will prompt the user to choose files and such and then will upload those files, either regularly or one time, whatever. But I don't know how to go abou doing such a thing, that is creating a app that will automatically upload to a back-up website(online storage). So if anyone can help me out or point me in the right direction that would be great. Thanks! -- http://mail.python.org/mailman/listinfo/python-list
Re: Connecting a Desktop App to a Web App
Okay, this is my first post to this mailing list, so first off if I shouldn't be sending something here, PLEASE correct me. Okay, so I want to create an app that has a GUI (most likely Tkinter) and will prompt the user to choose files and such and then will upload those files, either regularly or one time, whatever. But I don't know how to go abou doing such a thing, that is creating a app that will automatically upload to a back-up website(online storage). So if anyone can help me out or point me in the right direction that would be great. Thanks! There are two cases: (1) you are in control of the web app (2) you are not in control of the web app. (1) So you need to make the web app yourself too. There are several options for this the most popular ones are django and turbogears. For more see http://wiki.python.org/moin/WebFrameworks Once you have your web app up and running you can connect to it using some modules in the stdlib: http://docs.python.org/lib/module-urllib2.html http://docs.python.org/lib/module-httplib.html Basically you just create http requests in your desktop app and send those just as a browser would do. (2) You need to figure out the API of the web app you want to connect to. Once you have that use the stdlib modules to create the appropriate http requests just as above. HTH, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: Learning Python: Code critique please
http://macoovacany.wordpress.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Re: Connecting a Desktop App to a Web App
Okay, well I wouldn't be creating the app, so, any hints on how to figure out the API of a web app I don't know super well? -- http://mail.python.org/mailman/listinfo/python-list
Re: Buffer size when receiving data through a socket?
Dennis Lee Bieber wrote: On Wed, 18 Jun 2008 09:56:29 -0400, John Salerno [EMAIL PROTECTED] declaimed the following in comp.lang.python: Interesting point. I'm not sure if it works that way though. I *think* I tried sending an empty string from the server back to the client, and as expected it exited the loop and closed the client, which doesn't make sense to me, since an empty string could be perfectly valid return data. Okay... I suppose socket could consider a transmission with 0 data bytes as valid data. The main key is that there had to be send of 0 data -- opposed to just not receiving anything.. No, I think you're right. I read elsewhere that when I send() call returns 0 bytes, the connection is automatically closed. -- http://mail.python.org/mailman/listinfo/python-list
Re: Re: Connecting a Desktop App to a Web App
Okay, well I wouldn't be creating the app, so, any hints on how to figure out the API of a web app I don't know super well? Is it something like google, youtube, facebook, etc? These have publicly available API specifications. If it's just a random website without a well maintained public API you would look at the html source of the upload page and see what name:value pairs are sent along with the file from the form that does the upload. Then you would create such a POST request from python. Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: Ryhm�n sfnet.tietoliikenne.yhteydentarjoajat virallinen kuvaus
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Re: How to convert a into a
dominique [EMAIL PROTECTED] wrote:
On Jun 21, 1:37 pm, John Machin [EMAIL PROTECTED] wrote:
Look at the operator module. In your above example:
return {
'': operator.gt,
'=': operator.eq,
'': operator.lt,
}[variable]
Thanks a lot John
Dominique
Yes, but you need to remember that what you are getting is not literally an
operator. That is, if you store that return value in a variable called
op, you can't say this:
if x op y:
Instead, what you have is a function, so you'll have to write it:
if op( x, y ):
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[issue3008] Let bin() show floats
Raymond Hettinger [EMAIL PROTECTED] added the comment: Applied in r64438 -- status: open - closed ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue3008 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3158] Doctest fails to find doctests in extension modules
Amaury Forgeot d'Arc [EMAIL PROTECTED] added the comment: For me, a 'function' is written in Python, a 'builtin' is written in C. The fact that it is defined in an extension module is irrelevant, and depends on the implementation: zlib is an extension module on Unix, but is linked inside python26.dll on Windows. maybe inspect.isroutine() is the correct test here. -- nosy: +amaury.forgeotdarc ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue3158 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3131] 2to3 can't find fixes_dir
Helmut Jarausch [EMAIL PROTECTED] added the comment:
This patch seems to work, but
when invoked it tries to write to /usr/local/lib/python3.0/lib2to3
( I get
root: Writing failed:[Errno 13] Permission denied: '/usr/local/lib/
python3.0/lib2to3/PatternGrammar3.0.0.beta.1.pickle'
)
I hope this will be handled during install in future.
Furthermore, as a test, I copied refactor.py to xxx.py
and ran 2to3 on xxx.py
Here I get
RefactoringTool: Can't parse xxx.py: ParseError: bad input: type=22,
value='=', context=('', (67, 71))
This error message is a bit terse for someone not knowing the details
of 2to3
Thanks for the patch,
Helmut.
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[issue3159] glob.py improvements
New submission from Aristotelis Mikropoulos [EMAIL PROTECTED]: Simplified some of the code, improving performance and readability. -- components: Library (Lib) files: glob.py.patch keywords: patch messages: 68493 nosy: Indy severity: normal status: open title: glob.py improvements type: performance versions: Python 2.5 Added file: http://bugs.python.org/file10680/glob.py.patch ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue3159 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3131] 2to3 can't find fixes_dir
Georgij Kondratjev [EMAIL PROTECTED] added the comment: when invoked it tries to write to /usr/local/lib/python3.0/lib2to3 2to3 always worked like this. I always had to run it as root. Seems weird for me too. Furthermore, as a test, I copied refactor.py to xxx.py and ran 2to3 on xxx.py It seems to be a bug with 2to3 processing refactor.py. ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue3131 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3131] 2to3 can't find fixes_dir
Changes by Giampaolo Rodola' [EMAIL PROTECTED]: -- nosy: +giampaolo.rodola ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue3131 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3101] global function _add_one_to_C
Ricardo Quesada [EMAIL PROTECTED] added the comment: This seems to be fixed in r62348 http://svn.python.org/view?rev=62348view=rev -- nosy: +riq ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue3101 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3085] chapter 17.1.3.5 'Replacing os.popen*' in the Python library reference contains an error
Manuel Kaufmann [EMAIL PROTECTED] added the comment: I fixed this error, I attach the patch. -- keywords: +patch nosy: +humitos Added file: http://bugs.python.org/file10681/libsubprocess.diff ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue3085 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3043] Recursion bug in deepcopy
Facundo Batista [EMAIL PROTECTED] added the comment: Two weeks passed, closing it manually (see http://mail.python.org/pipermail/python-dev/2008-February/076992.html). -- nosy: +facundobatista status: pending - closed ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue3043 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3062] Turtle speed() function has no effect under Mac OS X
Ricardo Quesada [EMAIL PROTECTED] added the comment: turtle.py was replaced by a new module in r63929 . I can't reproduce this bug with this revision, so it seems to be fixed. using: os/x 10.5.3 intel. -- nosy: +riq ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue3062 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3101] global function _add_one_to_C
Martin v. Löwis [EMAIL PROTECTED] added the comment: Ok, so it's fixed for the trunk, but not Py3k. The trunk fix doesn't port to 3k, since the functions are called inside memoryobject.c (so making them static would break that module). -- versions: -Python 2.6 ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue3101 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3160] Building a Win32 binary installer crashes
New submission from Viktor Ferenczi [EMAIL PROTECTED]: Python 3.0b1, official MSI installer. Checkout source code of this project: http://code.google.com/p/anntools/ Enter into the root of your working copy and try to build a Win32 installer: C:\Python30\python.exe setup.py bdist_wininst NOTE: You might want to replace the path above with you Python installation path. Please ensure, that Python 3.0 is used, since all other versions from 2.4 to 2.6b1 works well. You will get the following traceback during the build process: Traceback (most recent call last): File setup.py, line 37, in module anntools, File C:\python30\lib\distutils\core.py, line 149, in setup dist.run_commands() File C:\python30\lib\distutils\dist.py, line 941, in run_commands self.run_command(cmd) File C:\python30\lib\distutils\dist.py, line 961, in run_command cmd_obj.run() File C:\python30\lib\distutils\command\bdist_wininst.py, line 177, in run self.create_exe(arcname, fullname, self.bitmap) File C:\python30\lib\distutils\command\bdist_wininst.py, line 263, in create_exe cfgdata = cfgdata + \0 TypeError: can't concat bytes to str -- components: Distutils messages: 68500 nosy: complex severity: normal status: open title: Building a Win32 binary installer crashes type: crash versions: Python 3.0 ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue3160 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3160] Building a Win32 binary installer crashes
Viktor Ferenczi [EMAIL PROTECTED] added the comment: Fixed by appending the b (bytes) prefix to three string literals concatenated to cfgdata in C:\python30\lib\distutils\command\bdist_wininst.py: Line #262: # Append the pre-install script cfgdata = cfgdata + b\0 if self.pre_install_script: script_data = open(self.pre_install_script, r).read() cfgdata = cfgdata + script_data + b\n\0 else: # empty pre-install script cfgdata = cfgdata + b\0 file.write(cfgdata) Sorry for the source code fragment. I'll try to submit a patch instead next time. ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue3160 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue2701] csv.reader accepts string instead of file object (duck typing gone bad)
Facundo Batista [EMAIL PROTECTED] added the comment: Skip is right, this is working ok. -- nosy: +facundobatista resolution: - invalid status: open - closed ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue2701 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue2732] curses.textpad loses characters at the end of lines
Anthony Lenton [EMAIL PROTECTED] added the comment: This doesn't happen to me with 2.6 compiled from HEAD, or with 2.5.2 shipped with Ubuntu Hardy. In both cases the output is: Contents of text box: '123456789\n123456789\n' -- nosy: +elachuni ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue2732 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3161] Missing import for sys in _abcoll
New submission from Simon Cross [EMAIL PROTECTED]: The _hash method of the Set ABC uses sys.maxsize but doesn't import sys. The attached patch (against trunk) imports sys and adds a test to show the problem. There are also still some other _abcoll.py cleanups waiting in issue 2226. -- components: Library (Lib), Tests files: abcoll-hash.diff keywords: patch messages: 68504 nosy: hodgestar severity: normal status: open title: Missing import for sys in _abcoll versions: Python 2.6, Python 3.0 Added file: http://bugs.python.org/file10682/abcoll-hash.diff ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue3161 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue1817] module-cgi: handling GET and POST together
Nubis [EMAIL PROTECTED] added the comment: This was pretty much done when I got here. It broked the other cgi_test (which tests some other corner cases). Patch includes modifications to Lib/cgi.py and adds Lib/test/test_cgi_post_qs.py to test the new features. This should be closed by now, but since this is my first patch, just let me know what else should I do to get it closed. thanks! -- keywords: +patch nosy: +Nubis versions: +Python 2.6 Added file: http://bugs.python.org/file10683/post_qs.patch ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue1817 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3161] Missing import for sys in _abcoll
Simon Cross [EMAIL PROTECTED] added the comment: One could also make a case for simply removing the _hash method since it doesn't look like anything is using it? And anything that was using it would already be broken? ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue3161 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3132] implement PEP 3118 struct changes
Jean Brouwers [EMAIL PROTECTED] added the comment: If the struct changes are made, add also 2 formats for C types ssize_t and size_t, perhaps 'z' resp. 'Z'. In particular since on platforms sizeof(size_t) != sizeof(long). -- nosy: +MrJean1 ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue3132 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue1044479] docs for Py_UNICODE are wrong
Manuel Muradás [EMAIL PROTECTED] added the comment: This looks fixed to me. The current documentation is much more clear. Look: http://docs.python.org/api/unicodeObjects.html -- nosy: +dieresys ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue1044479 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue2813] No float formatting in PyString_FromFormat
Ricardo Quesada [EMAIL PROTECTED] added the comment: Do you expect to have support for float, double and long double ? Also, do you expect to have support for precision-modifiers ? -- nosy: +riq ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue2813 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue1044479] docs for Py_UNICODE are wrong
Manuel Muradás [EMAIL PROTECTED] added the comment: This is the link to the current py_unicode documentation: http://docs.python.org/dev/c-api/unicode.html ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue1044479 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3001] RLock's are SLOW
sebastian serrano [EMAIL PROTECTED] added the comment: Running with python -O the timing gets a little closer between Lock and RLock. This code won't be easy to improve in performance. The heaviest call is current_thread(), used at lines: 117:me = current_thread() 137:if self.__owner is not current_thread(): and only consist on: 788: def current_thread(): 789: try: 790: return _active[_get_ident()] 791: except KeyError: 792: ##print current_thread(): no current thread for, _get_ident() 793: return _DummyThread() Simple profiler dump: $../python-trunk/python -O rlock.py time Lock 0.720541000366 time RLock 4.90231084824 44 function calls in 0.982 CPU seconds Ordered by: internal time, call count ncalls tottime percall cumtime percall filename:lineno(function) 100.3040.0000.3900.000 threading.py:116(acquire) 100.2780.0000.3600.000 threading.py:136(release) 10.2320.2320.9820.982 rlock.py:27(testRLock) 200.1680.0000.1680.000 threading.py:788(current_thread) 10.0000.0000.0000.000 threading.py:103(__init__) 10.0000.0000.0000.000 threading.py:98(RLock) 10.0000.0000.0000.000 threading.py:76(__init__) 00.000 0.000 profile:0(profiler) -- nosy: +sserrano ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue3001 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue1817] module-cgi: handling GET and POST together
Guido van Rossum [EMAIL PROTECTED] added the comment: Thanks for your contribution! To get this commmitted, please draw the attention of someone else on python-dev (or if you're an IRC person try #python-dev at freenote, IIRC). I'd recommend moving the tests into the existing test_cgi.py. ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue1817 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue1491] BaseHTTPServer incorrectly implements response code 100
Neil Muller [EMAIL PROTECTED] added the comment: The attached patch is against recent svn (r64442), and adds samwyse's refactoring of the class. The test for server responses is made less restrictive when the request isn't HTTP/1.1. -- nosy: +Neil Muller Added file: http://bugs.python.org/file10684/BaseHTTPServer_continue_2.patch ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue1491 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue2118] smtplib.SMTP() raises socket.error rather than SMTPConnectError
Rodolpho Eckhardt [EMAIL PROTECTED] added the comment: Verified Werneck's patch and it also works on 2.6 and 3.0. However, the previous code used to present a friendly message about non-numeric ports: socket.error: nonnumeric port and now it raises ValueError: invalid literal for int() with base 10. Should it be changed to inform that the exception is due to a non-numeric port? (Just wrap int(port) with a try and change the raised exception) -- nosy: +rodolpho versions: +Python 2.6, Python 3.0 ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue2118 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue2776] urllib2.urlopen() gets confused with path with // in it
Adrianna Pinska [EMAIL PROTECTED] added the comment: I have written a test to go with my patch. Added file: http://bugs.python.org/file10685/doubleslash_test.patch ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue2776 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue2683] subprocess.Popen.communicate takes bytes, not str
Changes by Martin v. Löwis [EMAIL PROTECTED]: ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue2683 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue2683] subprocess.Popen.communicate takes bytes, not str
admin [EMAIL PROTECTED] added the comment: What is wrong? Documentation or method? ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue2683 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3162] ssl.SSLSocket implements methods that are overriden by socket.socket.__init__ and methods with incorrect names.
New submission from Simon Cross [EMAIL PROTECTED]: It appears that ssl.SSLSocket attempts to override some of the methods socket.socket delegates to the underlying _socket.socket methods. However, this overriding fails because socket.socket.__init__ replaces all the methods mentioned in _delegate_methods. These methods are: recv, recvfrom, recv_into, recvfrom_into, send and sendto. ssl.SSLSocket implements recv and send. Neither of these overrides will actually work. ssl.SSLSocket also implements recv_from and send_to which seem to be attempts to override recvfrom and sendto. In the Py3k branch it looks like the overriding done by socket.socket.__init__ is gone so that these methods are now potentially overridable. This could potentially be emulated in trunk by checking for the methods using hasattr(...) before overriding them. I'm happy to create patches which fix the method names and clean up the methods on both branches and add tests. I just want to check that I have an accurate picture of what's needed before starting on them. -- components: Library (Lib) messages: 68517 nosy: hodgestar severity: normal status: open title: ssl.SSLSocket implements methods that are overriden by socket.socket.__init__ and methods with incorrect names. versions: Python 2.6, Python 3.0 ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue3162 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3155] Python should expose a pthread_cond_timedwait API for threading
Changes by Adam Olsen [EMAIL PROTECTED]: -- nosy: +Rhamphoryncus ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue3155 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue1044479] docs for Py_UNICODE are wrong
Facundo Batista [EMAIL PROTECTED] added the comment: Thanks Thomas and Manuel! -- nosy: +facundobatista resolution: - fixed status: open - closed ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue1044479 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
