date:20110725

Saul Spatz wrote:

 In tcl/tk an Entry widget can be set to validate its contents with the
 validate option.  You have to give it a validatecommand (vcmd), which is a
 tcl script that runs when some action triggers validation.  Usually, the
 script would use percent substitutions so the script would be something
 like {ValidInt %P} where %P is the value of the widget should the proposed
 change occur.
 
 Can one do something like this in tkinter?  I've verified that with
 
 e = Entry(master, validate = 'all', vcmd = validInt)
 
 the validInt function is called, but it isn't passed any parameters. I
 can't find that e has any attribute corresponding to the %P value above.
 
 Is it not possible to do this in tkinter, or have I overlooked something?

Some time ago I came up with 

http://mail.python.org/pipermail/python-list/2009-September/1220447.html

import Tkinter as tk

def validate(before, after):
print before, --, after
return after.isdigit()

if __name__ == __main__:
root = tk.Tk()
name = root.register(validate)
cmd = 'expr {[%(name)s %(parms)s]}' % dict(name=name, parms=%s %P)
var = tk.StringVar()
entry = tk.Entry(root, textvariable=var,
 validate=all, validatecommand=cmd)
entry.pack()
entry.focus_set()
root.mainloop()


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Re: Aw: python.org back up ?(was Re: python.org is down?)

2011-07-25 Thread Carl Banks

On Sunday, July 24, 2011 11:42:45 AM UTC-7, David Zerrenner wrote:
 *pew* I can't live without the docs, that really made my day now.

If you can't live without the docs, you should consider downloading them and 
accessing them locally.  That'll let you work whenever python.org goes down, 
and will help keep the load off the server when it's up.


Carl Banks
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Re: Strings show as brackets with a 'u'.

2011-07-25 Thread Ulrich Eckhardt

Chris Angelico wrote:
 On Sun, Jul 24, 2011 at 10:33 AM, goldtech goldt...@worldpost.com wrote:

 I'm using using Idle on winXP, activestate 2.7. Is there a way to
 suppress this and just show 174  in the shell ?
 A script reading data and assigns 174 to n via some regex. Links on
 this appreciated - I've tried to understand unicode before, will keep
 trying...thanks.
 
 There's two things there. Firstly, your regex is returning a list, not
 a string; and secondly, you are seeing repr(n) instead of just its
 content. Try:
 print(n[0])
 
 This should print just the value.
 
 (Pro tip: rantingrick is a troll. You can safely ignore him.)

If he's a troll, he's one of the better trolls here IMHO because he gave the 
best advise in this thread. You just gave the OP a fish, he provided a 
valuable advise on fishing itself.

Uli

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Geschäftsführer: Thorsten Föcking, Amtsgericht Hamburg HR B62 932

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Re: Validating Entry in tkinter

2011-07-25 Thread Wolfgang Meiners

Am 25.07.11 02:11, schrieb Saul Spatz:
 In tcl/tk an Entry widget can be set to validate its contents with the 
 validate option.  You have to give it a validatecommand (vcmd), which is a 
 tcl script that runs when some action triggers validation.  Usually, the 
 script would use percent substitutions so the script would be something 
 like {ValidInt %P} where %P is the value of the widget should the proposed 
 change occur.  
 
 Can one do something like this in tkinter?  I've verified that with
 
 e = Entry(master, validate = 'all', vcmd = validInt) 
 
 the validInt function is called, but it isn't passed any parameters. I can't 
 find that e has any attribute corresponding to the %P value above.
 
 Is it not possible to do this in tkinter, or have I overlooked something? 

Hi,
i think you can find the answer using the following link:
http://stackoverflow.com/questions/4140437/python-tkinter-interactively-validating-entry-widget-content

Wolfgang
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Aw: Re: Aw: python.org back up ?(was Re: python.org is down?)

2011-07-25 Thread David Zerrenner

Carl Banks wrote:
 If you can't live without the docs, you should consider downloading them and 
 accessing them locally.  That'll let you work whenever python.org goes down, 
 and will help keep the load off the server when it's up.

Thanks for the pointer, i did not realize that until now... These days of 
always-on internet corrupted me so much.

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Re: Convert '165.0' to int

2011-07-25 Thread Steven D'Aprano

On Mon, 25 Jul 2011 10:07 am Billy Mays wrote:

 On 7/24/2011 2:27 PM, SigmundV wrote:

 list_of_integers = map(string_to_int, list_of_strings)

 Of course, this will be horribly slow if you have thousands of
 strings. In such a case you should use an iterator (assuming you use
 python 2.7):

 import itertools as it
 iterator = it.imap(string_to_int, list_of_strings)

 
 if the goal is speed, then you should use generator expressions:
 
 list_of_integers = (int(float(s)) for s in list_of_strings)


I'm not intending to pick on Billy or Sigmund here, but for the beginners
out there, there are a lot of myths about the relative speed of map, list
comprehensions, generator expressions, etc.

The usual optimization rules apply:

We should forget about small efficiencies, say about 97% of 
the time: premature optimization is the root of all evil.
-- Donald Knuth

More computing sins are committed in the name of efficiency 
(without necessarily achieving it) than for any other single 
reason - including blind stupidity. -- W.A. Wulf

and of course:

If you haven't measured it, you're only guessing whether it is 
faster or slower. 

(And unless you're named Raymond Hettinger, I give little or no credibility
to your guesses except for the most obvious cases. *wink*)

Generators (including itertools.imap) include some overhead which list
comprehensions don't have (at least in some versions of Python). So for
small sets of data, creating the generator may be more time consuming than
evaluating the generator all the way through.

For large sets of data, that overhead is insignificant, but in *total*
generators aren't any faster than creating the list up front. They can't
be. They end up doing the same amount of work: if you have to process one
million strings, then whether you use a list comp or a gen expression, you
still end up processing one million strings. The only advantage to the
generator expression (and it is a HUGE advantage, don't get me wrong!) is
that you can do the processing lazily, on demand, rather than all up front,
possibly bailing out early if necessary.

But if you end up pre-processing the entire data set, there is no advantage
to using a gen expression rather than a list comp, or map. So which is
faster depends on how you end up using the data.

One other important proviso: if your map function is a wrapper around a
Python expression:

map(lambda x: x+1, data)
[x+1 for x in data]

then the list comp will be much faster, due to the overhead of the function
call. List comps and gen exprs can inline the expression x+1, performing it
in fast C rather than slow Python.

But if you're calling a function in both cases:

map(int, data)
[int(x) for x in data]

then the overhead of the function call is identical for both the map and the
list comp, and they should be equally as fast. Or slow, as the case may be.

But don't take my word on this! Measure, measure, measure! Performance is
subject to change without notice. I could be mistaken.

(And don't forget that everything changes in Python 3. Whatever you think
you know about speed in Python 2, it will be different in Python 3.
Generator expressions become more efficient; itertools.imap disappears; the
built-in map becomes a lazy generator rather than returning a list.)


-- 
Steven

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cross-compiling python-2.5.1 for PPC, error in Modules/unicodedata.o

2011-07-25 Thread Robert P. J. Day


  not sure if this is the right list for this, but it's a starting
point.  i'm using a wind river linux development environment to build
a full system for a powerpc board, and that includes cross-compiling
python-2.5.1 for ppc.  the compile fails thusly:

powerpc-wrs-linux-gnu-ppc_e500v2-glibc_std-gcc -shared
Modules/unicodedata.o   -o Modules/unicodedata.so
Modules/unicodedata.o: file not recognized: File truncated
collect2: ld returned 1 exit status
Makefile:1159: *** [Modules/unicodedata.so] Error 1

... snip ...
#0  Modules/unicodedata.so at
/home/rpjday/workspace/8548_prj/build/python-2.5.1/BUILD/Python-2.5.1/Makefile:1159
#1  oldsharedmods at
/home/rpjday/workspace/8548_prj/build/python-2.5.1/BUILD/Python-2.5.1/Makefile:440
#2  all at
/home/rpjday/workspace/8548_prj/build/python-2.5.1/BUILD/Python-2.5.1/Makefile:353
Command-line arguments:
OPT=-g -O2 -fomit-frame-pointer -pipe -g -O2
-fomit-frame-pointer -pipe -D_GNU_SOURCE -fPIC -I=/usr/include
-I=/home/rpjday/workspace/8548_prj/host-cross/powerpc-wrs-linux-gnu/sysroot/usr/include/krb5
DESTDIR=/home/rpjday/workspace/8548_prj/host-cross/powerpc-wrs-linux-gnu/sysroot/usr/lib/../..
HOSTPYTHON=./hostpython HOSTPGEN=./Parser/hostpgen
error: Bad exit status from
/home/rpjday/workspace/8548_prj/build/python-2.5.1/rpm-tmp.86223
(%build)
... snip ...

  you can see that the file Modules/unicodedata.o is flagged as not
recognized.  in fact, it exists but is empty.  i'm going to continue
digging around but i'm open to suggestions.  i also have the full 1700
lines of output from the beginning of the cross-compile if anyone
wants to see it.  thanks, and is there a more appropriate place to ask
this?

rday

-- 


Robert P. J. Day Ottawa, Ontario, CANADA
http://crashcourse.ca

Twitter:   http://twitter.com/rpjday
LinkedIn:   http://ca.linkedin.com/in/rpjday

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Re: reportlab import error after dundled using py2exe

2011-07-25 Thread Robin Becker


On 22/07/2011 03:55, SANKAR . wrote:

Hi all,





C:\Python26\distDELchek.exe
Traceback (most recent call last):
File DELchek.py, line 12, inmodule
File reportlab\pdfgen\canvas.pyc, line 25, in
File reportlab\pdfbase\pdfdoc.pyc, line 22, in
File reportlab\pdfbase\pdfmetrics.pyc, line 23,
File reportlab\pdfbase\_fontdata.pyc, line 158,
ImportError: No module named _fontdata_enc_winansi

But I could see the '_fontdata_enc_winansi' module in reportlab folder.
Could someone help me to fix this.


.
You can try asking this in the reportlab list

reportlab-us...@lists2.reportlab.com

but perhaps this is more about py2exe than reportlab. The modules 
_fontdata_enc_*  _fontdata_widths_* are imported dynamically in _fontdata.py 
rather than explicitly. I suspect that py2exe needs to be given a hint that this 
is going on. However, I'm uncertain as to why this should be required since even 
if the imports are being dynamically imported that is done as soon as _fontdata 
is imported (ie it's part of the module code) so those modules should be seen by 
the setup.py.


If you don't have reportlab explicitly imported as part of the packages try 
adding this to the packages list


packages=[




'reportlab',
'reportlab.graphics.charts',
'reportlab.graphics.samples',
'reportlab.graphics.widgets',
'reportlab.graphics.barcode',
'reportlab.graphics',
'reportlab.lib',
'reportlab.pdfbase',
'reportlab.pdfgen',
'reportlab.platypus',
],


that's what we use to make the distributions and seems to work.
--
Robin Becker

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PyCon UK 2011 - 24th to 25th September 2011 - Conference Announcement and Booking details

2011-07-25 Thread Zeth

The UK's official Python conference returns. It is aimed at everyone
in the Python community, of all skill levels, from beginners to core
developers.

The conference will be held on the 24th to 25th September 2011, in the
TechnoCentre Coventry (CV1 2TT).

The conference is not-for-profit and community-run by volunteers. It
is your conference so you can give a talk, lead a workshop or help
with publicity - see our wiki for more details.

In particular, it would help a lot if you can forward this
announcement to your Python-using friends and colleagues and relevant
mailing lists, or link to our website on Twitter, Facebook, Google+
and so on.

Booking is open now. The ticket cost for the weekend is £95 which
includes access to all sessions, lunches, refreshments, the exclusive
PyCon UK T-shirt and the unmissable conference dinner (Concession rate
is £75).

For more details and to book, please visit our website at http://pyconuk.org/
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Re: Aw: Re: Aw: python.org back up ?(was Re: python.org is down?)

2011-07-25 Thread hackingKK

Infact the  first thing I ever did  with documentation on Python was to 
download it.
yes you are not uptodate but you can always do a download once in a 
while rather than putting load on the server every time you want to 
lookup a function reference.

Happy hacking.
Krishnakant.

On 25/07/11 14:32, David Zerrenner wrote:

Carl Banks wrote:

If you can't live without the docs, you should consider downloading them and 
accessing them locally.  That'll let you work whenever python.org goes down, 
and will help keep the load off the server when it's up.

Thanks for the pointer, i did not realize that until now... These days of 
always-on internet corrupted me so much.



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Re: PEP 8 and extraneous whitespace

2011-07-25 Thread Neil Cerutti

On 2011-07-24, Ben Finney ben+pyt...@benfinney.id.au wrote:
 Code is also more densely expressive and provides less
 redundancy in expression, and the reader is required to make
 much finer scrutiny of it than of natural language text.

The best writing is less redundant than a line of code, not more.
But most people don't have enough time to write that little.

-- 
Neil Cerutti
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Re: Validating Entry in tkinter

Thanks so much, this is great.  I want to validate that the user is entering a 
string appropriate for bytes.fromhex.  Here's how I modified your validate 
funtion:

def validate(before, after):
print(before, --, after)
#return after.isdigit()
return after[-1] in '1234567890abcdefABCDEF '

I also had to change validate=all to validate=key in the Entry 
construction, since otherwise, I go an IndexError when the widget gets the 
focus.  (try...except also worked, but I only care about keystrokes.)

I didn't know about the register method; that's the key.

Thanks again,
Saul 
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Pipe in the return statement

Hi,

I have come across something I don't really understand and would be
grateful if someone could shed some light into my understanding of it.

In the documentation of the Qt4 libs in the page regarding the
QAbstractTableModel you find, to make the table editable, the
following:

Qt::ItemFlags StringListModel::flags(const QModelIndex index) const
{
if (!index.isValid())
return Qt::ItemIsEnabled;

 return QAbstractItemModel::flags(index) | Qt::ItemIsEditable;
}

Now I'm working with PySide, the Python bindings from Nokia and I
figured the
return in the function to be related with a parent
(QAbstractItemModel)
followed by the actual Flag that says: yes the item, the index is
pointing
at, is actually editable. So translation of the C++ to Python would
be, and
it actually worked:

def flags(self, index):
if not index.isValid():
return Qt.ItemIsEnabled

return super(self.__class__, self).flags(index) |
Qt.ItemIsEditable

Still I dont get how I am supposed to understand the pipe and its task/
idea/influece on control flow, of:
return statement | statement
??

Thankful if you could help me with this.

Kind regards,
Archard Lias
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Re: Pipe in the return statement

2011-07-25 Thread Ian Collins


On 07/26/11 12:00 AM, Archard Lias wrote:

Hi,

Still I dont get how I am supposed to understand the pipe and its task/
idea/influece on control flow, of:
returnstatement  |statement
??


It's simply a bitwise OR.

--
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Re: Validating Entry in tkinter

That doesn't work, I'm being stupid,  The user might type anywhere in the 
string, not just at the end.  I need

return all([c in '1234567890abcdefABCDEF ' for c in after])
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Re: Pipe in the return statement

2011-07-25 Thread Christian Heimes

Am 25.07.2011 14:00, schrieb Archard Lias:
 def flags(self, index):
 if not index.isValid():
 return Qt.ItemIsEnabled
 
 return super(self.__class__, self).flags(index) |

Your use of super() is incorrect and will not work as you might expect.
You *must* use the class here, never self.__class__.

Christian

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Re: Validating Entry in tkinter

Saul Spatz wrote:

 That doesn't work, I'm being stupid,  The user might type anywhere in the
 string, not just at the end.  I need
 
 return all([c in '1234567890abcdefABCDEF ' for c in after])

Ah, you found out already. Here's what I've come up with in the meantime.
I also changed the command to a tuple as in the example pointed out by 
Wolfgang.

import tkinter as tk

def is_valid_fromhex(s):
for pad in , 0:
try:
bytes.fromhex(s + pad)
except ValueError:
pass
else:
return True
return False

def validate(before, after):
print(before, --, after)
return is_valid_fromhex(after)

if __name__ == __main__:
root = tk.Tk()
cmd = (root.register(validate), %s, %P)
entry = tk.Entry(root, validate=all, validatecommand=cmd)
entry.pack()
entry.focus_set()
root.mainloop()

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Re: Pipe in the return statement

2011-07-25 Thread TonyO

 Still I dont get how I am supposed to understand the pipe and its task/
 idea/influece on control flow, of:
 return statement | statement

In the words of René Magritte,

return statement | statement
   ^
Ceci n'est pas une pipe.
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Re: Pipe in the return statement

2011-07-25 Thread gwowen

On Jul 25, 1:52 pm, TonyO guinness.t...@gmail.com wrote:

 return statement | statement

 In the words of René Magritte,

 return statement | statement
                    ^
 Ceci n'est pas une pipe.

*golf clap*
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Re: Tkinter/py2exe with installer

2011-07-25 Thread John Posner

On 2:59 PM, Kevin Walzer wrote:
 Can anyone point me in the direction of a Tkinter/Python app that has
 been wrapped with py2exe and is deployed on Windows as a standalone
 using one of the standard installer tools? (MSI, NSIS, Inno Setup,
 etc.) I'm working on a Tkinter app for Windows and have had a
 surprisingly hard time finding such apps to use as
 examples/benchmarks, etc. (The only one I've found, in fact, is
 Webgobbler at http://sebsauvage.net/python/webgobbler/index.html; a
 nice app, but I'd like more examples.)

I used Inno Setup 5.4.0(a) to create the ClixTur executable at
http://www.jjposner.net/5273.html

Inno Setup gives the executable an execrable name (looks like a GUID),
but it works fine.

HTH,
John

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Re: Tkinter/py2exe with installer

2011-07-25 Thread John Posner

On 2:59 PM, Kevin Walzer wrote:
 Can anyone point me in the direction of a Tkinter/Python app that has
 been wrapped with py2exe and is deployed on Windows as a standalone
 using one of the standard installer tools? (MSI, NSIS, Inno Setup,
 etc.) I'm working on a Tkinter app for Windows and have had a
 surprisingly hard time finding such apps to use as
 examples/benchmarks, etc. (The only one I've found, in fact, is
 Webgobbler at http://sebsauvage.net/python/webgobbler/index.html; a
 nice app, but I'd like more examples.)


I used Inno Setup 5.4.0(a) to create the ClixTur executable at
http://www.jjposner.net/5273.html

Inno Setup gives the .exe file a GUID for a name (ugh!) but it works fine.

HTH,
John

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Re: Pipe in the return statement

On Jul 25, 2:03 pm, Ian Collins ian-n...@hotmail.com wrote:
 On 07/26/11 12:00 AM, Archard Lias wrote:

  Hi,

  Still I dont get how I am supposed to understand the pipe and its task/
  idea/influece on control flow, of:
  returnstatement  |statement
  ??

 It's simply a bitwise OR.

 --
 Ian Collins

Yes, but how does it get determined, which one actually gets returned?
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Re: Pipe in the return statement

2011-07-25 Thread Billy Mays


On 07/25/2011 10:16 AM, Archard Lias wrote:

On Jul 25, 2:03 pm, Ian Collinsian-n...@hotmail.com  wrote:

On 07/26/11 12:00 AM, Archard Lias wrote:


Hi,



Still I dont get how I am supposed to understand the pipe and its task/
idea/influece on control flow, of:
returnstatement|statement
??


It's simply a bitwise OR.

--
Ian Collins


Yes, but how does it get determined, which one actually gets returned?



The return statement returns a single value from a function context. 
The pipe operator takes 2 values and bitwise ORs* them together.  That 
result is then returned to the caller.  The pipe character in this 
instance is not the same as in a shell.


* This is not exactly true, but don't worry about it.

--
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Re: Pipe in the return statement

2011-07-25 Thread Oliver Bestwalter

Hello Archard,

On 25.07.2011, at 16:16, Archard Lias wrote:

 On Jul 25, 2:03 pm, Ian Collins ian-n...@hotmail.com wrote:
 On 07/26/11 12:00 AM, Archard Lias wrote:
 
 Hi,
 
 Still I dont get how I am supposed to understand the pipe and its task/
 idea/influece on control flow, of:
 returnstatement  |statement
 ??
 
 It's simply a bitwise OR.
 
 --
 Ian Collins
 
 Yes, but how does it get determined, which one actually gets returned?

You do a Bitwise OR with numbers. Your statements are both returning numbers 
and those are combined with a bitwise OR. Combining b0001 with b0010 results in 
0011 for example, you can see this very often done in C Code to set and check 
flags. Here is a gentle introduction:

http://www.codeproject.com/KB/tips/Binary_Guide.aspxhttp://www.codeproject.com/KB/tips/Binary_Guide.aspx

Cheers
Oliver

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Re: Pipe in the return statement

2011-07-25 Thread John Gordon

In 1c175da2-79f4-40ed-803f-217dc935d...@m8g2000yqo.googlegroups.com Archard 
Lias archardl...@googlemail.com writes:

   return statement | statement
 
  It's simply a bitwise OR.

 Yes, but how does it get determined, which one actually gets returned?

Neither value is returned on its own; the bitwise OR of both values is
computed and that value is returned.

It seems that you don't understand what the term bitwise or means.
Perhaps a Google search might help.

-- 
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gor...@panix.com  B is for Basil, assaulted by bears
-- Edward Gorey, The Gashlycrumb Tinies

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Re: Pipe in the return statement

2011-07-25 Thread gwowen

On Jul 25, 3:16 pm, Archard Lias archardl...@googlemail.com wrote:

 Yes, but how does it get determined, which one actually gets returned?


It's a bit-wise or, not a logical or so what get returns is a
combination of the two results.  The n-th bit of the return value is 1
if the n-th bit of either (or both) of the two statements

(Fixed width font)
a 1 1 0 0 0 1 1 1 0 0 1 0 1 ...
b 0 1 0 1 0 0 1 0 0 0 0 1 1 ...
a|b   1 1 0 1 0 1 1 0 0 0 1 1 1 ...
(/Fixed width font)
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How to catch an memory error in Windows?

2011-07-25 Thread António Rocha

Greetings

I'm using subprocess module to run an external Windows binary. Due to some
limitations, sometimes all memory is consumed in this process. How can I
catch this error?
Antonio
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Re: Refactor/Rewrite Perl code in Python

2011-07-25 Thread J Kenneth King

Steven D'Aprano steve+comp.lang.pyt...@pearwood.info writes:

 On Sun, Jul 24, 2011 at 7:29 PM, Shashwat Anand anand.shash...@gmail.com
 wrote:

 How do I start ?
 The idea is to rewrite module by module.
 But how to make sure code doesn't break ?

 By testing it.

 Read up on test driven development.

 At this point, you have this:

 Perl modules: A, B, C, D
 Python modules: none
 Python tests: none

 Now, before you rewrite each Perl module in Python, first write a good,
 comprehension test suite in Python for that module. You need to have tests
 for each function and method. Test that they do the right thing for both
 good data and bad data. If you have functional requirements for the Perl
 modules, use that as your reference, otherwise use the Perl code as the
 reference.

 For example, this might be a basic test suite for the len() built-in
 function:


 for empty in ([], {}, (), set([]), ):
 if len(empty) != 0:
 raise AssertionError('empty object gives non-zero len')

 for n in range(1, 5):
 if len(x*n) != n:
 raise AssertionError('failure for string')
 for kind in (list, tuple, set):
 obj = kind([None]*n)
 if len(obj) != n:
 raise AssertionError('failure for %s' % obj)

 if len({'a': 1, 'b': None, 42: 'spam'}) != 3:
 raise AssertionError('failure for dict')

 for bad_obj in (23, None, object(), 165.0, True):
 try:
 len(bad_obj)
 except TypeError:
 # Test passes!
 pass
 else:
 # No exception means len() fails!
 raise AssertionError('failed test')



 Multiply that by *every* function and method in the module, and you have a
 moderately good test suite for module A.

 (You may want to learn about the unittest module, which will help.)

 Now you have:

 Perl modules: A, B, C, D
 Python modules: none
 Python tests: test_A

 Now re-write the Python module, and test it against the test suite. If it
 fails, fix the failures. Repeat until it passes, and you have:

 Perl modules: A, B, C, D
 Python modules: A
 Python tests: test_A

 Now you can be confident that Python A does everything that Perl A does.
 Possibly *better* than the Perl module, since if you don't have a test
 suite for it, it probably has many hidden bugs.

 Continue in this way with the rest of the modules. At the end, you will have
 a full test suite against the entire collection of modules.

A very sane approach.

I currently support a large legacy application written in C++ by
extending it with Python.  We managed to do this by wrapping the legacy
application with a Python interface using the Boost::Python libraries.
It has allowed us to embrace and extend the legacy code and replace bits
of it one piece at a time while keeping the whole application running.

Now I am not aware of any Python bindings to the Perl interpreter, but
if there is some FFI library that makes it possible this approach might
be viable for your project.

The trade-off of this approach is the extra complexity of maintaining
another interface in your code.  The beneift is that you can avoid
re-writing a large amount of code up front.  This works particularly
well when the legacy system has a rather large user base and you don't
have a robust test suite for the legacy code.

One book I found particularly useful: 

http://www.amazon.ca/Working-Effectively-Legacy-Michael-Feathers/dp/0131177052

hth
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Re: Pipe in the return statement

On Jul 25, 4:39 pm, John Gordon gor...@panix.com wrote:
 In 1c175da2-79f4-40ed-803f-217dc935d...@m8g2000yqo.googlegroups.com Archard 
 Lias archardl...@googlemail.com writes:

return statement | statement

   It's simply a bitwise OR.
  Yes, but how does it get determined, which one actually gets returned?

 Neither value is returned on its own; the bitwise OR of both values is
 computed and that value is returned.

 It seems that you don't understand what the term bitwise or means.
 Perhaps a Google search might help.

 --
 John Gordon                   A is for Amy, who fell down the stairs
 gor...@panix.com              B is for Basil, assaulted by bears
                                 -- Edward Gorey, The Gashlycrumb Tinies

It figures, that you are right :P.
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Re: How to catch an memory error in Windows?

2011-07-25 Thread Thomas Jollans

On 25/07/11 16:55, António Rocha wrote:
 Greetings
 
 I'm using subprocess module to run an external Windows binary. Due to
 some limitations, sometimes all memory is consumed in this process. How
 can I catch this error?
 Antonio
 

How is this relevant to the Python part?

Also, no memory left is not necessarily an error, it's simply a fact
of life. How to catch it depends on how you're (here, you means the
external process) allocating the memory - The POSIX C malloc function
will return NULL and set errno to ENOMEM, for example.

Thomas
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Re: Pipe in the return statement

On Jul 25, 4:35 pm, Oliver Bestwalter oli...@bestwalter.de wrote:
 Hello Archard,

 On 25.07.2011, at 16:16, Archard Lias wrote:









  On Jul 25, 2:03 pm, Ian Collins ian-n...@hotmail.com wrote:
  On 07/26/11 12:00 AM, Archard Lias wrote:

  Hi,

  Still I dont get how I am supposed to understand the pipe and its task/
  idea/influece on control flow, of:
  returnstatement  |statement
  ??

  It's simply a bitwise OR.

  --
  Ian Collins

  Yes, but how does it get determined, which one actually gets returned?

 You do a Bitwise OR with numbers. Your statements are both returning numbers 
 and those are combined with a bitwise OR. Combining b0001 with b0010 results 
 in 0011 for example, you can see this very often done in C Code to set and 
 check flags. Here is a gentle introduction:

 http://www.codeproject.com/KB/tips/Binary_Guide.aspxhttp://www.codepr...

 Cheers
 Oliver

Oh!, never gave it a thought about the fact that what I was looking at
where flags... Thank you very much for the link, is a great
introduction to something I had not known before.
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Re: Pipe in the return statement

On Jul 25, 2:33 pm, Christian Heimes li...@cheimes.de wrote:
 Am 25.07.2011 14:00, schrieb Archard Lias:

  def flags(self, index):
      if not index.isValid():
          return Qt.ItemIsEnabled

      return super(self.__class__, self).flags(index) |

 Your use of super() is incorrect and will not work as you might expect.
 You *must* use the class here, never self.__class__.

 Christian

It would be great if you could elaborate a little more on that. Am I
not supposed to access the parent here?

--
Archard
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ANN: Intro+Intermediate Python course, SF, Oct 18-20

2011-07-25 Thread wesley chun

Need to get up-to-speed with Python as quickly and as in-depth as
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Please pass on this note to whomever you think may be interested. I
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around the PDF flyer linked down below. Write if you have questions.

Since I hate spam, I'll only send out one reminder as the date gets
closer.

(Comprehensive) Intro+Intermediate Python
Tue-Thu, 2011 Oct 18-20, 9am-5pm

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Online has asked me to deliver a 1-hour webcast a couple of years ago
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download (reg req'd):
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wesley.chun : wescpy-gmail.com : @wescpy
python training and technical consulting
cyberweb.consulting : silicon valley, ca
http://cyberwebconsulting.com
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Trying to learn about metaclasses

2011-07-25 Thread Steven W. Orr

I have been doing a lot of reading. I'm starting to get it. I think it's 
really cool as well as dangerous, but I plan on being respectful of the 
construct. I found a web page that I found quite readable.


http://cleverdevil.org/computing/78/

So, I tried to run the example code (below), and I get AttributeError. If 
someone can get me over this hump, I'd be grateful. It complains that Person 
has no _fields attribute, but the print hello I have in EnforcerMeta doesn't 
happen either. Am I doing something wrong?


I'm running python 2.6.2

Here's the error:

585  ./meta1.py
Traceback (most recent call last):
  File ./meta1.py, line 38, in module
swo.name = 'swo'
  File ./meta1.py, line 27, in __setattr__
if key in self._fields:
AttributeError: 'Person' object has no attribute '_fields'


And here's the code:

#! /usr/bin/python
# http://cleverdevil.org/computing/78/
class Field(object):
def __init__(self, ftype):
self.ftype = ftype

def is_valid(self, value):
return isinstance(value, self.ftype)

class EnforcerMeta(type):
def __init(cls, name, bases, ns):
# Store the field definitions on the class as a dictionary
# mapping the field name to the Field instance.
print 'Hello'
cls._fields = {}

# loop through the namespace looking for Field instances.
for key, value in ns.items():
if isinstance(value, Field):
cls._fields[key] = value

class Enforcer(object):
# attach the metaclass
__metaclass__ = EnforcerMeta

def __setattr__(self, key, value):
if key in self._fields:
if not self._fields[key].is_valid(value):
raise TypeError('Invalid type for field.')
super(Enforcer, self).__setattr__(key, value)

class Person(Enforcer):
name = Field(str)
age = Field(int)

if __name__ == '__main__':
swo = Person()
swo.name = 'swo'
print 'swo:', swo


--
Time flies like the wind. Fruit flies like a banana. Stranger things have  .0.
happened but none stranger than this. Does your driver's license say Organ ..0
Donor?Black holes are where God divided by zero. Listen to me! We are all- 000
individuals! What if this weren't a hypothetical question?
steveo at syslang.net
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Re:How to catch an memory error in Windows?

2011-07-25 Thread António Rocha

Hi
I just want to use the Python part to catch this event as an error
try:
 subprocess
except ERROR:

I just wanted to know if there is any special error that I can use to catch
this error?
THanks
-- Forwarded message --
From: Thomas Jollans t...@jollybox.de
To: python-list@python.org
Date: Mon, 25 Jul 2011 17:14:46 +0200
Subject: Re: How to catch an memory error in Windows?
On 25/07/11 16:55, António Rocha wrote:
 Greetings

 I'm using subprocess module to run an external Windows binary. Due to
 some limitations, sometimes all memory is consumed in this process. How
 can I catch this error?
 Antonio


How is this relevant to the Python part?

Also, no memory left is not necessarily an error, it's simply a fact
of life. How to catch it depends on how you're (here, you means the
external process) allocating the memory - The POSIX C malloc function
will return NULL and set errno to ENOMEM, for example.

Thomas
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Re: Trying to learn about metaclasses

2011-07-25 Thread jfine

Hi

I gave a tutorial at this year's EuroPython that covered metaclasses.
You can get the tutorial materials from a link on:
http://ep2011.europython.eu/conference/talks/objects-and-classes-in-python-and-javascript


Jonathan
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Re: Trying to learn about metaclasses

Steven W. Orr wrote:

 I have been doing a lot of reading. I'm starting to get it. I think it's
 really cool as well as dangerous, but I plan on being respectful of the
 construct. I found a web page that I found quite readable.
 
 http://cleverdevil.org/computing/78/
 
 So, I tried to run the example code (below), and I get AttributeError. If
 someone can get me over this hump, I'd be grateful. It complains that
 Person has no _fields attribute, but the print hello I have in
 EnforcerMeta doesn't happen either. Am I doing something wrong?
 
 I'm running python 2.6.2
 
 Here's the error:
 
 585  ./meta1.py
 Traceback (most recent call last):
File ./meta1.py, line 38, in module
  swo.name = 'swo'
File ./meta1.py, line 27, in __setattr__
  if key in self._fields:
 AttributeError: 'Person' object has no attribute '_fields'

 And here's the code:
 
 class EnforcerMeta(type):
  def __init(cls, name, bases, ns):

You misspelt __init__()

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Re: Pipe in the return statement

2011-07-25 Thread Christian Heimes

Am 25.07.2011 17:28, schrieb Archard Lias:
 It would be great if you could elaborate a little more on that. Am I
 not supposed to access the parent here?

You must spell out the parent explicitly, otherwise subclasses call
super() with themselves rather than the correct parent class.
self.__class__ is too dynamic here. Have a look at this example:

class A(object):
def method(self):
pass

class B(A):
def method(self):
super(self.__class__, self).method()

class C(B):
pass

In this example, C().method() results in super(C, self).method()
because self.__class__ is C. However that is wrong because you have to
call super() with the direct parent.

Christian

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Re: Convert '165.0' to int

2011-07-25 Thread SigmundV

On Jul 25, 10:48 am, Steven D'Aprano steve
+comp.lang.pyt...@pearwood.info wrote:

 One other important proviso: if your map function is a wrapper around a
 Python expression:

 map(lambda x: x+1, data)
 [x+1 for x in data]

 then the list comp will be much faster, due to the overhead of the function
 call. List comps and gen exprs can inline the expression x+1, performing it
 in fast C rather than slow Python.

 But if you're calling a function in both cases:

 map(int, data)
 [int(x) for x in data]

 then the overhead of the function call is identical for both the map and the
 list comp, and they should be equally as fast. Or slow, as the case may be.

I would like to thank Steven for his enlightening (at least for me)
post.

In the OP's case I'd keep everything as lists initially. If speed then
is an issue other constructs can be considered. The use of map in the
example only reflects my inherently mathematical way of thinking.

Generally, I'd say

1) write code that works, i.e. does what it's intended to do in all
cases, and
2) if speed is an issue, try to sort out the main culprits.

Coding style is a different issue altogether, but in general I'd say
that one should use self-explanatory variable names.


Sigmund
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Re: python.org is down?

2011-07-25 Thread SigmundV

On Jul 24, 8:43 am, Laszlo Nagy gand...@shopzeus.com wrote:
 Can it be a problem on my side? I have tried from several different
 computers. I cannot even ping it.

Whenever a page can't be accessed, although your connection is good,
http://www.downforeveryoneorjustme.com/ is a good site to check.


Sigmund
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Re: Pipe in the return statement

On 25 Jul., 18:11, Christian Heimes li...@cheimes.de wrote:
 Am 25.07.2011 17:28, schrieb Archard Lias:

  It would be great if you could elaborate a little more on that. Am I
  not supposed to access the parent here?

 You must spell out the parent explicitly, otherwise subclasses call
 super() with themselves rather than the correct parent class.
 self.__class__ is too dynamic here. Have a look at this example:

 class A(object):
     def method(self):
         pass

 class B(A):
     def method(self):
         super(self.__class__, self).method()

 class C(B):
     pass

 In this example, C().method() results in super(C, self).method()
 because self.__class__ is C. However that is wrong because you have to
 call super() with the direct parent.

 Christian

Oh! Get it, thanks a lot :P

--
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Re: learning another programing language

2011-07-25 Thread SigmundV

On Jul 24, 9:59 am, Benjamin Gregg benjamin.gr...@virginmedia.com
wrote:
 Hi
 python was my first language but I need to learn C++ and java for a
 project (No there isn't an alternative)
 and I want to know is there any good tutorials or tips for learning
 C++/java after using python?

I think it's always best to approach a new language with a completely
open mind. It's never good to think of one language in terms of
another, so I'd say: forget about Python while learning C++ and Java.
One should always learn about the strenghts and weaknesses of each
language in itself. E.g. there is plenty of Python code out there,
which is just C or C++ code using Python syntax. That is just sad.


Sigmund
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Re: Validating Entry in tkinter

Yes, the tuple is certainly easier to read.

Thanks again.
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Re: Convert '165.0' to int

2011-07-25 Thread Billy Mays


On 07/25/2011 05:48 AM, Steven D'Aprano wrote:

But if you're calling a function in both cases:

map(int, data)
[int(x) for x in data]



I am aware the premature optimization is a danger, but its also 
incorrect to ignore potential performance pitfalls.


I would favor a generator expression here, if only because I think its 
easier to read.  In addition, it properly handles large amounts of data 
by not duplicating the list.  For very long input sequences, genexp 
would be the proper thing to do (assuming you don't need to index into 
results, in which case, its wrong.)


I think the fastest way to solve the OP's problem is the following: ;)

def convert_165_0_to_int(arg):
return 165


--
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Re: Validating Entry in tkinter

Thanks, that a great link.
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Re: Aw: Re: Aw: python.org back up ?(was Re: python.org is down?)

2011-07-25 Thread Terry Reedy


On 7/25/2011 7:25 AM, hackingKK wrote:

Infact the first thing I ever did with documentation on Python was to
download it.
yes you are not uptodate but you can always do a download once in a
while rather than putting load on the server every time you want to
lookup a function reference.
Happy hacking.
Krishnakant.

On 25/07/11 14:32, David Zerrenner wrote:

Carl Banks wrote:

If you can't live without the docs, you should consider downloading
them and accessing them locally. That'll let you work whenever
python.org goes down, and will help keep the load off the server when
it's up.

Thanks for the pointer, i did not realize that until now... These days
of always-on internet corrupted me so much.


The windows distribution comes with the docs bundled in a windows help 
file, updated with each bug fix release. Is there really no *nix 
equivalent that could be used or is this one area where windows really wins?


--
Terry Jan Reedy

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Re: Validating Entry in tkinter

2011-07-25 Thread Terry Reedy


On 7/25/2011 8:31 AM, Peter Otten wrote:

Saul Spatz wrote:


That doesn't work, I'm being stupid,  The user might type anywhere in the
string, not just at the end.  I need

return all([c in '1234567890abcdefABCDEF ' for c in after])


If one wants to validate keystrokes, rather than the entire field after 
the fact, is it possible to set an onkey handler, that will pass on 
valid keys?


--
Terry Jan Reedy

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Re: Trying to learn about metaclasses

2011-07-25 Thread Karim



Very good.

Karim

On 07/25/2011 05:46 PM, jfine wrote:

Hi

I gave a tutorial at this year's EuroPython that covered metaclasses.
You can get the tutorial materials from a link on:
http://ep2011.europython.eu/conference/talks/objects-and-classes-in-python-and-javascript


Jonathan


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Re: python.org is down?

2011-07-25 Thread Tim Chase


On 07/25/2011 11:45 AM, SigmundV wrote:

On Jul 24, 8:43 am, Laszlo Nagygand...@shopzeus.com  wrote:

Can it be a problem on my side? I have tried from several different
computers. I cannot even ping it.


Whenever a page can't be accessed, although your connection is good,
http://www.downforeveryoneorjustme.com/ is a good site to check.


The problem is when www.downforeveryoneorjustme.com goes 
down...do you then go to 
www.isdownforeveryoneorjustmedownforeveryoneorjustme.com


? :-)

-tkc




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Re: Trying to learn about metaclasses

2011-07-25 Thread Chris Kaynor

On Mon, Jul 25, 2011 at 8:36 AM, Steven W. Orr ste...@syslang.net wrote:

 I have been doing a lot of reading. I'm starting to get it. I think it's
 really cool as well as dangerous, but I plan on being respectful of the
 construct. I found a web page that I found quite readable.

 http://cleverdevil.org/**computing/78/http://cleverdevil.org/computing/78/

 So, I tried to run the example code (below), and I get AttributeError. If
 someone can get me over this hump, I'd be grateful. It complains that Person
 has no _fields attribute, but the print hello I have in EnforcerMeta doesn't
 happen either. Am I doing something wrong?

 I'm running python 2.6.2

 Here's the error:

 585  ./meta1.py
 Traceback (most recent call last):
  File ./meta1.py, line 38, in module
swo.name = 'swo'
  File ./meta1.py, line 27, in __setattr__
if key in self._fields:
 AttributeError: 'Person' object has no attribute '_fields'


 And here's the code:

 #! /usr/bin/python
 # http://cleverdevil.org/**computing/78/http://cleverdevil.org/computing/78/
 class Field(object):
def __init__(self, ftype):
self.ftype = ftype

def is_valid(self, value):
return isinstance(value, self.ftype)

 class EnforcerMeta(type):
def __init(cls, name, bases, ns):
# Store the field definitions on the class as a dictionary
# mapping the field name to the Field instance.
print 'Hello'
cls._fields = {}

# loop through the namespace looking for Field instances.
for key, value in ns.items():
if isinstance(value, Field):
cls._fields[key] = value

 class Enforcer(object):
# attach the metaclass
__metaclass__ = EnforcerMeta

def __setattr__(self, key, value):
if key in self._fields:
if not self._fields[key].is_valid(**value):
raise TypeError('Invalid type for field.')
super(Enforcer, self).__setattr__(key, value)


If I understand what you are trying to do here (other than playing with
metaclasses), you should be able to implement this as a descriptor (
http://docs.python.org/reference/datamodel.html#implementing-descriptors).

Something like (untested):

class Field(object):
   def __init__(self, name, type):
  self.ftype = type
  self.name = name

   def __get__(self, instance, owner):
  return getattr(instance, self.name)

   def __set__(self, instance, value):
  if not self.is_valid(value):
   raise TypeError()
  setattr(instance, self.name, value)

   def is_valid(self, value):
   return isinstance(value, self.ftype)



 class Person(Enforcer):
name = Field(str)
age = Field(int)

 if __name__ == '__main__':
swo = Person()
swo.name = 'swo'
print 'swo:', swo


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Re: Validating Entry in tkinter

Terry Reedy wrote:

 On 7/25/2011 8:31 AM, Peter Otten wrote:
 Saul Spatz wrote:

 That doesn't work, I'm being stupid,  The user might type anywhere in
 the
 string, not just at the end.  I need

 return all([c in '1234567890abcdefABCDEF ' for c in after])
 
 If one wants to validate keystrokes, rather than the entire field after
 the fact, 

It's not really after the fact as the user will not see the new contents 
unless they are accepted by the validatecommand handler.

 is it possible to set an onkey handler, that will pass on
 valid keys?

With validatecommand you can have tkinter provide the string that is being 
inserted:

import tkinter as tk

MESSAGE = (about to insert {text!r} at position {index} 
   ({resolution}))

def validate(action, index, text):
if action == 1:
accept = text.isdigit()
print(
MESSAGE.format(
resolution=OK if accept else rejected,
text=text,
index=index))
return accept
return True

if __name__ == __main__:
root = tk.Tk()
cmd = (root.register(validate), %d, %i, %S)
entry = tk.Entry(root, validate=all, validatecommand=cmd)
entry.pack()
entry.focus_set()
root.mainloop()

The available format codes are listed at 
http://www.tcl.tk/man/tcl8.4/TkCmd/entry.htm#M16

If you need something more specific you'd probably have to bind the 
KeyPress event to a custom handler:

import tkinter as tk

def keypress(event):
print(event.char)
if event.char:
if not event.char.isdigit() and event.char != \b:
return break
else:
print(Don't know what to do with key #, event.keycode)

if __name__ == __main__:
root = tk.Tk()
entry = tk.Entry(root)
entry.bind(KeyPress, keypress)
entry.pack()
entry.focus_set()
root.mainloop()


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Signal only works in main thread

2011-07-25 Thread RVince

I am instantiating an SSH client class using this class:

http://www.goldb.org/sshpython.html

With the following code:

sSHController = SSHController('xxx', 'root', 'password', '#')
sSHController.login()

Whereupon, at login(), it fails with a :

ValueError: signal only works in main thread

I'm at a complete loss here. Can someone please point me in the right
direction to solving this?   Thanks,
RVince
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Strange output from arange()

2011-07-25 Thread Christopher Barrington-Leigh

The following code:

from pylab import arange
nSegments=5.0
print arange(0,1.0+1.0/nSegments,1.0/nSegments)
nSegments=6.0
print arange(0,1.0+1.0/nSegments,1.0/nSegments)
nSegments=8.0
print arange(0,1.0+1.0/nSegments,1.0/nSegments)
nSegments=10.0
print arange(0,1.0+1.0/nSegments,1.0/nSegments)

gives an output of:

[ 0.   0.2  0.4  0.6  0.8  1. ]
[ 0.  0.1667  0.  0.5 0.6667
0.8333  1.  1.1667]
[ 0. 0.125  0.25   0.375  0.50.625  0.75   0.875  1.   ]
[ 0.   0.1  0.2  0.3  0.4  0.5  0.6  0.7  0.8  0.9  1. ]

These arrays have lengths, 6, 8, 9, and 11, in stead of 6, 7, 9, and
11.
What is going on for the case of n=6?

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Re: Here is what I came up with - hopefully I have understood the processcorrectly

2011-07-25 Thread Jane Griscti

You can use the 'Toolbutton' style in place of 'indicatoron'

button = Checkbutton(r, 
text='Test',
style='Toolbutton')
button.pack()



 On Sunday, March 13, 2011 11:08 PM Peter wrote:

 Hi I am struggling to get a good understanding of styles as used in
 ttk. I have read the tutorial section on using styles but have not been
 able to solve this problem.
 
 I am attempting to create a Checkbutton with the indicatoron=3Dfalse
 option. Using ttk the documentation is clear that you have to create a
 custom style to achieve this behaviour. But the only example I have
 been able to find on the Internet searches is written in Tcl i.e. here
 is what I have found (quoted directly):
 
 Here=92s how you set it up: To achieve the effect of -indicatoron false,
 create a new layout that doesn=92t have an indicator:
 
 style layout Toolbar.TCheckbutton {
 Toolbutton.border -children {
 Toolbutton.padding -children {
 Toolbutton.label
 }
 }
 }
 
 Then use style map and style default to control the border appearance:
 
 style default Toolbar.TCheckbutton \
 -relief flat
 style map Toolbar.TCheckbutton -relief {
 disabled flat
 selected sunken
 pressed sunken
 active raised
 
 Hopefully somebody else in this group has done this and can post
 their solution?
 
 Thanks
 Peter


 On Sunday, March 20, 2011 8:12 PM Peter wrote:

 Here is what I came up with - hopefully I have understood the process
 correctly and therefore that the comments are correct :-)
 
 I am not sure I have the color of the indicator when it is (de)pressed
 correct, but to my eyes the color 'snow' looks like the same color
 used with a Tkinter Checkbutton with indicatoron=false.
 
 r = Tk()
 
 s = Style()
 
 s.layout('NoIndicator.TCheckbutton',
 [('Checkbutton.border',
 {'children': [('Checkbutton.padding',
 {'children': [('Checkbutton.label',
 {})]})]})])
 
 checkbutton
 s.theme_settings('default', {
 'NoIndicator.TCheckbutton': {'configure': {'relief': ''}}})
 
 behaviour
 s.map('NoIndicator.TCheckbutton',
 relief=[('disabled', 'flat'),
 ('selected', 'sunken'),
 ('pressed', 'sunken'),
 ('active', 'raised'),
 ('!active', 'raised')],
 background=[('selected', 'snow')])
 
 button = Checkbutton(r,
 text='Test',
 style='NoIndicator.TCheckbutton')
 button.pack()
 
 r.mainloop()



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Re: Aw: Re: Aw: python.org back up ?(was Re: python.org is down?)

2011-07-25 Thread Ned Deily

In article j0k8er$itl$1...@dough.gmane.org,
 Terry Reedy tjre...@udel.edu wrote:
 The windows distribution comes with the docs bundled in a windows help 
 file, updated with each bug fix release. Is there really no *nix 
 equivalent that could be used or is this one area where windows really wins?

Most *nix distributions provide an optional doc package for each of the 
Python versions they support, for instance, in Debian:

$ aptitude search 'python[23].*-doc$'
p   python2.6-doc  
p   python2.7-doc 
p   python3-doc 
p   python3.1-doc
p   python3.2-doc 

Also each python.org Mac OS X installers includes a copy of the 
documentation for its version, in HTML format the same as the on-line 
versions.  The docs are easily accessible through a menu item in each 
version of IDLE.  And recent versions of the installer also include a 
clickable link to the docs in each /Applications/Python x.y folder.

One advantage of the on-line versions is that they are updated daily 
with the latest fixes to the documentation.

-- 
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 n...@acm.org

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Re: Strange output from arange()

2011-07-25 Thread Wanderer

On Jul 25, 3:20 pm, Christopher Barrington-Leigh
christophe...@gmail.com wrote:
 The following code:

     from pylab import arange
     nSegments=5.0
     print arange(0,1.0+1.0/nSegments,1.0/nSegments)
     nSegments=6.0
     print arange(0,1.0+1.0/nSegments,1.0/nSegments)
     nSegments=8.0
     print arange(0,1.0+1.0/nSegments,1.0/nSegments)
     nSegments=10.0
     print arange(0,1.0+1.0/nSegments,1.0/nSegments)

 gives an output of:

 [ 0.   0.2  0.4  0.6  0.8  1. ]
 [ 0.          0.1667  0.  0.5         0.6667
 0.8333  1.          1.1667]
 [ 0.     0.125  0.25   0.375  0.5    0.625  0.75   0.875  1.   ]
 [ 0.   0.1  0.2  0.3  0.4  0.5  0.6  0.7  0.8  0.9  1. ]

 These arrays have lengths, 6, 8, 9, and 11, in stead of 6, 7, 9, and
 11.
 What is going on for the case of n=6?

It's rounding.

See http://docs.scipy.org/doc/numpy/reference/generated/numpy.arange.html

  stop : number
  End of interval. The interval does not include this value,
except in some cases where step is not an integer and floating point
round-off affects the length of out.

The stops are

5 -- 1.2
6 -- 1.16667
8 -- 1.125
10 -- 1.1

Only 6 has to be rounded up.

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Re: Strange output from arange()

2011-07-25 Thread Robert Kern


On 7/25/11 2:20 PM, Christopher Barrington-Leigh wrote:

The following code:

 from pylab import arange
 nSegments=5.0
 print arange(0,1.0+1.0/nSegments,1.0/nSegments)
 nSegments=6.0
 print arange(0,1.0+1.0/nSegments,1.0/nSegments)
 nSegments=8.0
 print arange(0,1.0+1.0/nSegments,1.0/nSegments)
 nSegments=10.0
 print arange(0,1.0+1.0/nSegments,1.0/nSegments)

gives an output of:

[ 0.   0.2  0.4  0.6  0.8  1. ]
[ 0.  0.1667  0.  0.5 0.6667
0.8333  1.  1.1667]
[ 0. 0.125  0.25   0.375  0.50.625  0.75   0.875  1.   ]
[ 0.   0.1  0.2  0.3  0.4  0.5  0.6  0.7  0.8  0.9  1. ]

These arrays have lengths, 6, 8, 9, and 11, in stead of 6, 7, 9, and
11.
What is going on for the case of n=6?


Floating point computations are not always accurate, and when one tries to 
compute the same thing two different ways, one may get inconsistent results. 
This is what is happening with n=6. 1+1./6 happens to be slightly greater than 
7*(1./6) while 1+1./5 happens to be slightly less than 6*(1./5), etc. The trick 
of using 1.0+1.0/nSegments/2 tends to work better.


Nonetheless, if you want to get exactly nSegments segments with exact endpoints, 
you should use numpy.linspace(0.0, 1.0, nSegments+1). That's a much better API 
for what you want.


Also, you will want to ask numpy questions on the numpy-discussion mailing list, 
not here.


  http://www.scipy.org/Mailing_Lists

--
Robert Kern

I have come to believe that the whole world is an enigma, a harmless enigma
 that is made terrible by our own mad attempt to interpret it as though it had
 an underlying truth.
  -- Umberto Eco

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Re: Pipe in the return statement

2011-07-25 Thread Ethan Furman


Billy Mays wrote:

On 07/25/2011 10:16 AM, Archard Lias wrote:

On Jul 25, 2:03 pm, Ian Collinsian-n...@hotmail.com  wrote:

On 07/26/11 12:00 AM, Archard Lias wrote:

Still I dont get how I am supposed to understand the pipe and its task/
idea/influece on control flow, of:
returnstatement|statement
??


It's simply a bitwise OR.


Yes, but how does it get determined, which one actually gets returned?


The return statement returns a single value from a function context. The 
pipe operator takes 2 values and bitwise ORs* them together.  That 
result is then returned to the caller.


Just for completeness, if the actual line had been

return statement1 or statement2

then Python would compute statement1, and if its boolean value was 
True would return the computation of statement1, otherwise it would 
compute statement2 and return that.  When 'or' is used, the first 
truthy* item is return, or the last falsey* item if none evaluate to True.


-- None or 2 or 0
2
-- None or 2 or 3
2
-- None or [] or 0
0

With 'and', the first falsey item is returned, unless all the items are 
  truthy in which case the last item is returned:


-- 2 and 3
3
-- 2 and 0 and 9
0

Hope this helps.

~Ethan~

* 'truthy' = bool(some expression or object) == True
* 'falsey' = bool(some expression or object) == False
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Re: Validating Entry in tkinter

2011-07-25 Thread rantingrick

On Jul 25, 2:08 pm, Peter Otten __pete...@web.de wrote:
 Terry Reedy wrote:
  On 7/25/2011 8:31 AM, Peter Otten wrote:
  Saul Spatz wrote:
  is it possible to set an onkey handler, that will pass on
  valid keys?

 With validatecommand you can have tkinter provide the string that is being
 inserted:

Yes but it's messy and requires knowledge of Tcl! We to keep our code
bases as Pythonic as possible.

 If you need something more specific you'd probably have to bind the
 KeyPress event to a custom handler:

Exactly!

If you compare the code of the two approaches you'll see that the
python approach is more readable and does not export any magic
behind the scenes. By binding the KeyPress event and handling it in
some derived class people who are not familiar with Tcl\Tk can read
the code (and change it to suit their needs). The next best
alternative would be to extend Tk.Entry with a pythonic wrapper for
this functionality.

MORAL: Sometimes you are forced to export these things but in this
case i would argue that readability counts; so keep it in Python!
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Re: Validating Entry in tkinter

2011-07-25 Thread python

Peter,

How would your examples work with text being inserted or deleted via the
clipboard?

Is there anything special that would have to happen for changes to a
widget's value as the result of one of these events?

Thank you,
Malcolm (not the OP)
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Re: Signal only works in main thread

2011-07-25 Thread Chris Rebert

On Mon, Jul 25, 2011 at 12:19 PM, RVince rvinc...@gmail.com wrote:
 I am instantiating an SSH client class using this class:

 http://www.goldb.org/sshpython.html

You might consider using Paramiko instead:
http://www.lag.net/paramiko/

Cheers,
Chris
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Re: Signal only works in main thread

2011-07-25 Thread Miki Tebeka

Seems like pyssh (which is very old AFAIK) uses signal. Looks like you're 
creating the SSHController instance (which uses pyssh) not in the main thread, 
and Python won't allow you to place signal handlers outside the main thread.

You can probably move the SSHContorller creation to the main thread, or maybe 
try using a newer library (such as http://www.lag.net/paramiko/)
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Re: Validating Entry in tkinter

pyt...@bdurham.com wrote:

 How would your examples work with text being inserted or deleted via the
 clipboard?
 
 Is there anything special that would have to happen for changes to a
 widget's value as the result of one of these events?

I think it doesn't matter whether you type in text, or insert it with Ctrl+V 
or the middle mouse button. The validatecommand handler is always triggered.

I suspect achieving the same effect with Button/KeyPress handlers would 
require significantly more work.

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RE: Refactor/Rewrite Perl code in Python

2011-07-25 Thread Sells, Fred

Sometimes it's worth asking Why?

I assume there would be no need to rewrite if the existing code did most
of what was needed.  It may be easier to ask the customer what he really
wants rather than to re-engineer a crappy solution to an obsolete
problem.

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Re: Pipe in the return statement

2011-07-25 Thread red floyd

On Jul 25, 5:52 am, TonyO guinness.t...@gmail.com wrote:
  Still I dont get how I am supposed to understand the pipe and its task/
  idea/influece on control flow, of:
  return statement | statement

 In the words of René Magritte,

 return statement | statement
                    ^
 Ceci n'est pas une pipe.

We have a WINNER!!

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Re: PEP 8 and extraneous whitespace

2011-07-25 Thread Ethan Furman


Ed Leafe wrote:

Religious fervor is one thing; freedom of religion is another!  ;-)

We strive for readability in our code, yet every printed material

 designed to be read, such as books, newspapers, etc., uses a
 proportional font.

The books I purchase use monospaced fonts for code examples.  Yours don't?

~Ethan~
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Re: PEP 8 and extraneous whitespace

2011-07-25 Thread Ethan Furman


Brandon Harris wrote:

I don't really think lining things up makes them any easier to read.


I *totally* disagree.  Often I'm scanning a dict looking for either a 
key or a value, and having them lined up makes it much easier.  Yes, I 
have to reindent once in a while, but it's still a write few, read many 
operation.


~Ethan~
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Re: Validating Entry in tkinter

2011-07-25 Thread Malcolm Greene

Peter,

 I think it doesn't matter whether you type in text, or insert it with Ctrl+V 
 or the middle mouse button. The validatecommand handler is always triggered. 
 I suspect achieving the same effect with Button/KeyPress handlers would 
 require significantly more work.

Thank you!
Malcolm
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Re: PEP 8 and extraneous whitespace

2011-07-25 Thread Thomas Jollans

On 26/07/11 00:05, Ethan Furman wrote:
 Ed Leafe wrote:
 Religious fervor is one thing; freedom of religion is another!  ;-)

 We strive for readability in our code, yet every printed material
 designed to be read, such as books, newspapers, etc., uses a
 proportional font.
 
 The books I purchase use monospaced fonts for code examples.  Yours don't?

Strange that. Most do, but that's really just tradition.

I have Bjarne Stroustrup's The C++ Programming Language on my shelf,
and that prints code in a proportional font.

There are two possible reasons to prefer a monospaced font for code:

 1. You're used to it: tradition. This is a legacy of the era when
computers simply didn't display proportional fonts.

 2. Your editor (my usual preference, Vim, is an example) doesn't
support proportional fonts. This is a legacy of the era when
computers simply didn't display proportional fonts.

Code is different from prose. We parse it so differently that printing
it in a monospaced font doesn't significantly hurt readability - but it
doesn't make it more readable either.

In the end, it really doesn't matter. This is probably why I enjoyed
writing this message so much.

Thomas
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ActivePython: multiple versions on OSX?

2011-07-25 Thread Robert


Is it possible to install the 2 and 3 series side by side?

--
Robert


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Re: ActivePython: multiple versions on OSX?

2011-07-25 Thread Ned Deily

In article j0l14e$cuh$1...@dough.gmane.org, Robert sigz...@gmail.com 
wrote:

 Is it possible to install the 2 and 3 series side by side?

Probably.  On Mac OS X, t's certainly possible to install any python.org 
versions side by side, even multiple versions of 2 and 3.  That's one of 
the advantages of the Python framework build layout on OS X, which is 
used by both the python.org installers and, I believe, the ActiveState 
installers.

http://www.python.org/download/

-- 
 Ned Deily,
 n...@acm.org

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Re: Trying to learn about metaclasses

2011-07-25 Thread Victor Khangulov


Hi Steven,

I too am just learning about metaclasses in Python and I found the 
example you posted to be excellent.


I played around with it and noticed that the issue seems to be the 
double-underscore in front of the fields (cls.__fields = {}).  If you 
change this parameter to use the single-underscore, the code works 
perfectly.


I think that because of the double-underscore, the name of the attribute 
fields gets mangled by the interpreter and is not inherited from the 
parent class in its accessible form.  Now, I am not sure if the code 
posted uses an earlier version of Python where these rule are different 
or if there is a more correct way to achieve this.  I will follow this 
discussion to see if someone has a better answer.


-victor
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Tree structure

2011-07-25 Thread Bevan Jenkins

Hello,

I am trying to create a tree structure for use with a PyQt QTreeView.
But first I need to get my head around how to create the tree
structure.  I have a dictionary (for testing purposes) but I will
later use a table via sqlalchemy.

The use case is hydrology, so I  would like to have a hydrologically
connected river tree, in which you can browse upstream from the sea
(making choices) or downstream from any named hydrological feature.
Each key flows into its value pair. myrivers =
{river:flows_into}.  An example is below:

myrivers = {little stream:sea,
mountain stream:lake,
lake:big river,
cold spring:big river,
big river:sea
sea:}

I would like the tree to look like (if the formatting works). so
you can browse downstream from each named river but also upstream from
the sea picking which direction to go.

little stream
sea
mountain stream
lake
big river
sea
lake
big river
sea
cold spring
big river
sea
big river
sea
sea
little stream
big river
lake
mountain stream
cold spring

this next part is probably not very clear
So every key is a parent.  For all keys that have a value (not ),
the value is the child and is then used as a parent to get the next
child until the sea and a value of  is reached.  For the sea this is
reversed, that you find all rivers that flow into the sea and then all
rivers that flow into them.


Any thoughts about how to acomplish this will be much appreciated,
Bevan



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[issue12607] subprocess(stdout=..., stderr=sys.stdout) breaks stderr for child

2011-07-25 Thread Ross Lagerwall


Ross Lagerwall rosslagerw...@gmail.com added the comment:

Attached is a patch which tests all combinations and includes a testcase.

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Added file: http://bugs.python.org/file22747/i12607_v2.patch

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[issue12634] Random Remarks in class documentation

2011-07-25 Thread Ashutosh Swain


New submission from Ashutosh Swain ats.e...@gmail.com:

URL: http://docs.python.org/tutorial/classes.html
section: 9.4 Random Remarks 

The first sentense is bit confusing:
Data attributes override method attributes with the same name

Is it possible to change the sentense something like this:
Data attributes set through instance override method attributes with the same 
name

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messages: 141073
nosy: ats.engg, docs@python
priority: normal
severity: normal
status: open
title: Random Remarks in class documentation
type: feature request
versions: Python 2.7

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[issue12634] Random Remarks in class documentation

2011-07-25 Thread Raymond Hettinger


Raymond Hettinger raymond.hettin...@gmail.com added the comment:

The proposed rewrite doesn't make any sense to me.  Also set through is an 
reads awkwardly.

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[issue12633] sys.modules gets special treatment

2011-07-25 Thread Nick Coghlan


Nick Coghlan ncogh...@gmail.com added the comment:

+1 for making this limitation explicit. See the caveat on locals() [1] for an 
example of how to note this kind of restriction.

[1] http://docs.python.org/dev/library/functions.html#locals

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[issue12635] use as for block scope support

2011-07-25 Thread HaiYun Yan


New submission from HaiYun Yan lyricco...@gmail.com:

use as for block scope support
just like mozilla javascript let extension
https://developer.mozilla.org/en/new_in_javascript_1.7#Block_scope_with_let_%28Merge_into_let_Statement%29

usage:

as_clause(as_declare): as NAME
as_stmt: NAME as test
as_expr: ( expr as NAME ) expr

var declare by as_clause is alive in suite only
eg:
NAME f binding savedwith open(...) as fNAME f bind to HEAPObj:
   ...
NAME f binding restored

the same rule to except E as e: 

spec:
from socket import AF_INET as IPv4
IPv4 bind to socket.AF_INET slot
IPv4 = None
assert socket.AF_INET == None

var in as_stmt is alive in current indentation
eg:
for i in range(10):
   NAME t binding saved
   t as f()+1 NAME t bind to f()+1
   ...
   NAME t binding restored

var in as_expr is alive in sub expr only
eg:
t = None
x = (2+3 as t) t**2
assert t == None ane  x == 25

Suggestion:
new opcode
ENTER_BLOCK #depth #varslots

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priority: normal
severity: normal
status: open
title: use as for block scope support
type: feature request

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[issue12635] use as for block scope support

2011-07-25 Thread Ezio Melotti


Ezio Melotti ezio.melo...@gmail.com added the comment:

You should propose this to the python-ideas mailing list first.
It might be worth checking the archives of the ML as well -- I think I saw 
already something similar a while ago.

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resolution:  - rejected
stage:  - committed/rejected
status: open - closed

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[issue12634] Random Remarks in class documentation

2011-07-25 Thread Ezio Melotti


Ezio Melotti ezio.melo...@gmail.com added the comment:

Indeed that paragraph is not really clear.  I had to read it till the end 
(verbs for methods and nouns for data attributes) to figure out what it was 
talking about.  Even then it's still not clear what it's trying to say.
I *think* it means that if you have a class Foo with a method bar, and you do 
Foo.bar = 'data', the method will be overridden (so you won't be able to do 
Foo.bar for the 'data' and Foo.bar() for the method), but the opposite is also 
true.
Moreover I find both the suggestions for avoiding conflicts (capitalizing 
method names and/or using an underscore) wrong (both against PEP8).  Also it 
never happened to me to have an attribute with the same name of a method, and I 
think in general it's not a common case (becase, as the paragraph says, methods 
are verbs and attributes nouns).

The whole thing could be rewritten to just say that an attribute name always 
refers to a single object, either to a method or to some data.

--
nosy: +eric.araujo, ezio.melotti, terry.reedy
versions: +Python 3.2, Python 3.3

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[issue9998] ctypes find_library should search LD_LIBRARY_PATH on linux

2011-07-25 Thread Yaroslav Bulatov


Changes by Yaroslav Bulatov yarosla...@gmail.com:


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nosy: +yaroslavvb

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[issue9998] ctypes find_library should search LD_LIBRARY_PATH on linux

2011-07-25 Thread Yaroslav Bulatov


Yaroslav Bulatov yarosla...@gmail.com added the comment:

This causes problem for Freetype Python bindings on Linux

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[issue12607] subprocess(stdout=..., stderr=sys.stdout) breaks stderr for child


STINNER Victor victor.stin...@haypocalc.com added the comment:

save_fds should be moved outside the try block:

+try:
+# save a copy of the standard file descriptors
+saved_fds = [os.dup(fd) for fd in range(3)]
+...
+finally:
+for std, saved in enumerate(saved_fds):
+os.dup2(saved, std)
+os.close(saved)


temp_fds = [fd for fd, fname in temps] should also be moved outside its try 
block.

Why not using .communicate() to write into stdin and read stdout/stderr?

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[issue12636] IDLE ignores -- coding -- with -r option

2011-07-25 Thread ledave123


New submission from ledave123 ledave...@yahoo.fr:

I'm on Windows with cp1252 as the default encoding.
When I use -*- coding: c1252 -*- I get no problems.
When I use -*- coding: utf-8 -*- IDLE -r still opens the file with cp1252 
encoding.
Python.exe opens the file with utf-8 correctly.

I think the problem is in Python32\Lib\idlelib\PyShell.py line 585:
In class ModifiedInterpreter:

def execfile(self, filename, source=None):
Execute an existing file
if source is None:
source = open(filename, r).read() # this is the bug IMHO

--
components: IDLE
messages: 141081
nosy: ledave123
priority: normal
severity: normal
status: open
title: IDLE ignores -*- coding -*- with -r option
type: behavior
versions: Python 3.2

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[issue12632] Windows GPF with Code Page 65001


STINNER Victor victor.stin...@haypocalc.com added the comment:

You can use PYTHONIOENCODING=utf-8. Code page 65001 is not exactly like 
Python UTF-8 codec: see issue #6058.

Using issue #12281, it may be possible to implement a cp65001 codec.

See also issue #1602 for the Windows console.

Why do you use cp65001?

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[issue12625] sporadic test_unittest failure


STINNER Victor victor.stin...@haypocalc.com added the comment:

 getpid() is called after each kill(getpid(), signum),
 to force the signal delivery

Please write a function (in test.support?) with a comment explaining why you 
are doing that.

You may also only do this workaround on specific platforms. For example, only 
on FreeBSD and OpenIndiana (the test would be in the function).

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[issue10883] urllib: socket is not closed explicitly


STINNER Victor victor.stin...@haypocalc.com added the comment:

Thanks for your patch. ResourceWarning are really useful!

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[issue12637] logging lastResort handler not ignoring messages less than WARNING

2011-07-25 Thread Xavier de Gaye


New submission from Xavier de Gaye xdeg...@gmail.com:

The 'Advanced Logging Tutorial' states about the lastResort handler:
The handler’s level is set to WARNING, so all events at this and
greater severities will be output.

Python 3.2 does not follow this behavior:

Python 3.2 (r32:88445, Jun 18 2011, 20:30:18)
[GCC 4.3.2] on linux2
Type help, copyright, credits or license for more information.
 import logging
 root = logging.getLogger()
 root.setLevel('DEBUG')
 root.warning('warning msg')
warning msg
 root.debug('debug msg')
debug msg
 

This is fixed with the attached patch:

Type help, copyright, credits or license for more information.
 import logging
 root = logging.getLogger()
 root.setLevel('DEBUG')
 root.warning('warning msg')
warning msg
 root.debug('debug msg')


--
components: Library (Lib)
files: logging_lastResort.patch
keywords: patch
messages: 141085
nosy: xdegaye
priority: normal
severity: normal
status: open
title: logging lastResort handler not ignoring messages less than WARNING
type: behavior
versions: Python 3.2
Added file: http://bugs.python.org/file22748/logging_lastResort.patch

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[issue12463] Calling SocketServer.shutdown() when server_forever() was not called will hang

2011-07-25 Thread Petri Lehtinen


Petri Lehtinen pe...@digip.org added the comment:

Attached a patch with a test and the proposed fix.

--
keywords: +needs review, patch
stage:  - patch review
versions:  -Python 2.6, Python 3.1, Python 3.4
Added file: http://bugs.python.org/file22749/issue12463.patch

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[issue12632] Windows GPF with Code Page 65001

2011-07-25 Thread Bruce Ferris


Bruce Ferris bferri...@bferris.co.uk added the comment:

I use code page 65001 because 1) it displays the UTF-8 characters in my text 
files with echo filename on the command line, and 2) that's Microsoft's 
official (whatever that means) code page for UTF-8, and 3) it works in 
cmd.exe.

Setting aside why I use it, it IS used by some, and Python shouldn't GPF for 
ANY reason if it can be easily fixed.  Right?

Essentially, 65001 makes Microsoft's console output behave properly (at least 
with the limited characters in Lucinda Console) so I would think Python should 
consider not blowing up when it's set.  

To be honest, I just happened to have it set to 65001 to get the output from 
another program to look right and just happened to run Python to do some quick 
unrelated calculations.

Imagine my surprise when Python blew, especially when all I did was to run it.  
It's not like I asked it to do any UTF-8 or anthing!

Anyway, as far as I understand...  Any GPF is a potential back door.  So, it 
needs closing.

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[issue12326] Linux 3: code should avoid using sys.platform == 'linux2'

2011-07-25 Thread Éric Araujo


Éric Araujo mer...@netwok.org added the comment:

FTR, for Debian and derivatives, doko chose to use 'linux2' when building on 
linux3.

--
title: Linux 3: tests should avoid using sys.platform == 'linux2' - Linux 3: 
code should avoid using sys.platform == 'linux2'
versions:  -Python 3.4

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[issue12634] Random Remarks in class documentation

2011-07-25 Thread Éric Araujo


Éric Araujo mer...@netwok.org added the comment:

I have the same reading as Ezio, and the same opinion that it’s unclear and 
unhelpful.  +1 to saying that there is only one namespace for data attributes 
and methods.

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[issue12632] Windows GPF with Code Page 65001

2011-07-25 Thread R. David Murray


R. David Murray rdmur...@bitdance.com added the comment:

In this case it is not a potential security hole, since in fact the GPF comes 
from Python explicitly calling Abort because of a situation it can't handle, as 
indicated by the error message from Python.  (If it were a true segfault-like 
error, there would be no message from Python itself.)

--
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[issue12632] Windows GPF with Code Page 65001