Sala 1.1 released

[Petri Lehtinen]

Sala 1.1 has been released. This release adds ~/.config/sala.conf (or,
more specifically, $XDG_CONFIG_HOME/sala.conf) to the list of
configuration locations that are read, as per the XDG Base Directory
Specification. Python 2.5 is also now supported.

Install: pip install sala
Docs  download: http://pypi.python.org/pypi/sala
Git repository: http://github.com/akheron/sala


What is sala?
=

Sala is a command-line utility that lets you store passwords and other
bits of sensitive plain-text information to encrypted files on a
directory hierarchy. This makes it integrate nicely with the shell;
tab completion works, for example. It's also convenient to store your
passwords in version control, for example.

The stored information is protected by GnuPG's symmetrical encryption.

Sala has been written in Python. It requires gpg[1], the
GnuPGInterface[2] library, and (with the default configuration) uses
pwgen[3] to suggest good passwords, if it's installed.

[1] http://www.gnupg.org/
[2] http://py-gnupg.sourceforge.net/
[3] http://sourceforge.net/projects/pwgen/
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http://www.python.org/psf/donations/

parse GET/POST data on simple http server

[Markus]

Hi,

As a beginner in python, I am looking for example code that would help
me understand how to
code following idea:
1. Start minimal http server
2. Send GET or POST data (url encoded, or from form) - example
Name=Foo
3. Analyze the GET/POST variable value on server and match to
different value
example 'if Name = Foo then retval = Bar '
4. serve the content of retval back to user as plain html

If some code snipped that does implement all or part of the algorithm
is known to you, please point me to it. I would be thankful for any
push to the right direction.

Thank you!
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Re: parse GET/POST data on simple http server

[Corey Richardson]

On 02/03/2011 03:15 AM, Markus wrote:
 Hi,
 
 As a beginner in python, I am looking for example code that would help
 me understand how to
 code following idea:
 1. Start minimal http server
 2. Send GET or POST data (url encoded, or from form) - example
 Name=Foo
 3. Analyze the GET/POST variable value on server and match to
 different value
 example 'if Name = Foo then retval = Bar '
 4. serve the content of retval back to user as plain html
 
 If some code snipped that does implement all or part of the algorithm
 is known to you, please point me to it. I would be thankful for any
 push to the right direction.
 
 Thank you!

If you really can't use a 'real' webserver like Apache, I found [1]. Not
sure how to use it, never had the need to. The documentation will show
you the way, however. Using that and the cgi module, your requirements
should be fulfilled.
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Re: parse GET/POST data on simple http server

[Corey Richardson]

On 02/03/2011 03:15 AM, Markus wrote:
 Hi,
 
 As a beginner in python, I am looking for example code that would help
 me understand how to
 code following idea:
 1. Start minimal http server
 2. Send GET or POST data (url encoded, or from form) - example
 Name=Foo
 3. Analyze the GET/POST variable value on server and match to
 different value
 example 'if Name = Foo then retval = Bar '
 4. serve the content of retval back to user as plain html
 
 If some code snipped that does implement all or part of the algorithm
 is known to you, please point me to it. I would be thankful for any
 push to the right direction.
 
 Thank you!

[1] http://docs.python.org/library/cgihttpserver.html#module-CGIHTTPServer

...Sorry about that. I shouldn't post late at night!
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Re: parse GET/POST data on simple http server

[Chris Rebert]

On Thu, Feb 3, 2011 at 12:15 AM, Markus markus...@gmail.com wrote:
 Hi,

 As a beginner in python, I am looking for example code that would help
 me understand how to
 code following idea:
 1. Start minimal http server

http://docs.python.org/library/basehttpserver.html
http://docs.python.org/library/simplehttpserver.html
http://docs.python.org/library/cgihttpserver.html

 2. Send GET or POST data (url encoded, or from form) - example
 Name=Foo

http://docs.python.org/library/urllib.html#urllib.urlencode

 3. Analyze the GET/POST variable value on server and match to
 different value
    example 'if Name = Foo then retval = Bar '

http://docs.python.org/library/cgi.html

 4. serve the content of retval back to user as plain html

 If some code snipped that does implement all or part of the algorithm
 is known to you, please point me to it. I would be thankful for any
 push to the right direction.

You'll be reinventing quite a few wheels if you work at such a low
level of abstraction. Have you considered using a web framework?
Django (http://www.djangoproject.com/ ) is one of the popular ones,
though there are a myriad of options
(http://wiki.python.org/moin/WebFrameworks ). I would recommend
learning Python first and then a web framework, rather than trying to
learn both in tandem.

Cheers,
Chris
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Re: parse GET/POST data on simple http server

[Markus]

On Feb 3, 9:35 am, Chris Rebert c...@rebertia.com wrote:
 On Thu, Feb 3, 2011 at 12:15 AM, Markus markus...@gmail.com wrote:
  Hi,

  As a beginner in python, I am looking for example code that would help
  me understand how to
  code following idea:
  1. Start minimal http server

 http://docs.python.org/library/basehttpserver.htmlhttp://docs.python.org/library/simplehttpserver.htmlhttp://docs.python.org/library/cgihttpserver.html

  2. Send GET or POST data (url encoded, or from form) - example
  Name=Foo

 http://docs.python.org/library/urllib.html#urllib.urlencode

  3. Analyze the GET/POST variable value on server and match to
  different value
     example 'if Name = Foo then retval = Bar '

 http://docs.python.org/library/cgi.html

  4. serve the content of retval back to user as plain html

  If some code snipped that does implement all or part of the algorithm
  is known to you, please point me to it. I would be thankful for any
  push to the right direction.

 You'll be reinventing quite a few wheels if you work at such a low
 level of abstraction. Have you considered using a web framework?
 Django (http://www.djangoproject.com/) is one of the popular ones,
 though there are a myriad of options
 (http://wiki.python.org/moin/WebFrameworks). I would recommend
 learning Python first and then a web framework, rather than trying to
 learn both in tandem.

 Cheers,
 Chris
 --http://blog.rebertia.com

Thank you for all that input, I will definitely check Django - it
looks very interesting.
I just found an example code that fits perfectly and is simple enough
for me to play with it.
http://stackoverflow.com/questions/336866/how-to-implement-a-minimal-server-for-ajax-in-python
And one older post handling the same case with HTTPS:
http://groups.google.com/group/comp.lang.python/browse_thread/thread/a1e761a02a852821/2ff6f704b3a6749a?lnk=gstq=server+parse+post#2ff6f704b3a6749a

:o)
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Re: IDLE: A cornicopia of mediocrity and obfuscation.

[Red John]

On Feb 2, 9:03 pm, alex23 wuwe...@gmail.com wrote:
 rantingrick rantingr...@gmail.com wrote:
  Hmm, that coming from someone who has two posts in this group. And the
  last he posted was a year ago!

 Wait, I thought you had the approval of the silent majority?

 So once anyone actually posts, they lost the right to be counted,
 because only when they shut up can you consider them allies?

Lulz, +1 internetz for you
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Re: DRY and static attribute for multiple classes.

[Peter Otten]

Marc Aymerich wrote:

 On Feb 2, 12:11 am, Peter Otten __pete...@web.de wrote:
 Marc Aymerich wrote:

 Hi!,
 Unfortunately per_class attribute losses the independence when I try
 to mix it with django models.Model .
 
 from django.db import models
 class Plugin(models.base.ModelBase):
 class __metaclass__(type):
 def __init__(self, *args):
 type.__init__(self, *args)
 self.per_class = []
 
 class BaseService(models.Model):
 class Meta:
 abstract = True
 
 __metaclass__ = Plugin
 
 class VirtualHost(BaseService):
 name = models.CharField(max_length=10)
 
 class SystemUser(BaseService):
 name = models.CharField(max_length=10)
 
 
 VirtualHost.per_class is SystemUser.per_class
 True
 
 What am I doing wrong?

I'm surprised that you are seeing the per_class-attribute at all as you are 
defining it in the metaclass of the metaclass, as far as I can tell.
I think the following should work:

from django.db import models

class Plugin(models.base.ModelBase):
def __init__(self, *args):
super(Plugin, self).__init__(*args)
self.per_class = []
 
class BaseService(models.Model):
class Meta:
abstract = True

__metaclass__ = Plugin

class VirtualHost(BaseService):
name = models.CharField(max_length=10)

class SystemUser(BaseService):
name = models.CharField(max_length=10)

assert VirtualHost.per_class is not SystemUser.per_class

But I have never worked with Django, and the approach based on dictionary 
lookup is less likely to interfere with the dark corners of the framework.

Peter
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Re: Reassign or discard Popen().stdout from a server process

[Nobody]

On Tue, 01 Feb 2011 08:30:19 +, John O'Hagan wrote:

 I can't keep reading because that will block - there won't be any more
 output until I send some input, and I don't want it in any case.
 
 To try to fix this I added:
 
 proc.stdout = os.path.devnull
 
 which has the effect of stopping the server from failing, but I'm not
 convinced it's doing what I think it is.

It isn't. os.path.devnull is a string, not a file. But even if you did:

proc.stdout = open(os.path.devnull, 'w')

that still wouldn't work.

 If I replace devnull in the above line with a real file, it stays empty
 although I know there is more output, which makes me think it hasn't
 really worked. 

It hasn't.

 Simply closing stdout also seems to stop the crashes, but doesn't that mean 
 it's still being written to, but the writes are just silently failing? In 
 either case I'm wary of more elusive bugs arising from misdirected stdout.

If you close proc.stdout, the next time the server writes to its stdout,
it will receive SIGPIPE or, if it catches that, the write will fail with
EPIPE (write on pipe with no readers). It's up to the server how it deals
with that.

 Is it possible to re-assign the stdout of a subprocess after it has started? 

No.

 Or just close it? What's the right way to read stdout up to a given
 line, then discard the rest?

If the server can handle the pipe being closed, go with that. Otherwise,
options include redirecting stdout to a file and running tail -f on the
file from within Python, or starting a thread or process whose sole
function is to read and discard the server's output.

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Re: os.path.join doubt

[Nobody]

On Thu, 03 Feb 2011 06:31:49 +, Steven D'Aprano wrote:

 On Wed, 02 Feb 2011 20:46:12 -0800, harryos wrote:
 
 In windows ,I tried this
 
 p1 = C:\Users\me\Documents
 p2 = ..\Pictures\images\my.jpg

Don't do this; backslash is significant within Python string literals. If
want to use literal backslashes in a string literal, either double them:

p1 = C:\\Users\\me\\Documents

or use a raw literal:

p1 = rC:\Users\me\Documents

You got away with it because backslash is only significant when followed
by specific characters, none of which occurred in this case.

 BTW, Windows accepts / as well as \ as a path separator. You will have 
 far fewer headaches if you use that.

Unless you need to pass strings to the command interpreter, which has its
own interpretation of forward slashes. Apart from that, while forward
slashes are supported by Windows itself, they aren't the standard
separator, and may not be supported by other programs running on Windows.

In general, directory separators shouldn't occur within string
literals. Base directories should be taken from command-line parameters,
registry entries, configuration files, environment variables etc, not
embedded into the program. Paths relative to those directories should be
constructed with os.path.join().

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Re: DRY and static attribute for multiple classes.

[Marc Aymerich]

On Feb 3, 10:24 am, Peter Otten __pete...@web.de wrote:
 Marc Aymerich wrote:
  On Feb 2, 12:11 am, Peter Otten __pete...@web.de wrote:
  Marc Aymerich wrote:
  Hi!,
  Unfortunately per_class attribute losses the independence when I try
  to mix it with django models.Model .

  from django.db import models
  class Plugin(models.base.ModelBase):
      class __metaclass__(type):
          def __init__(self, *args):
              type.__init__(self, *args)
              self.per_class = []

  class BaseService(models.Model):
      class Meta:
          abstract = True

      __metaclass__ = Plugin

  class VirtualHost(BaseService):
      name = models.CharField(max_length=10)

  class SystemUser(BaseService):
      name = models.CharField(max_length=10)

  VirtualHost.per_class is SystemUser.per_class
  True

  What am I doing wrong?

 I'm surprised that you are seeing the per_class-attribute at all as you are
 defining it in the metaclass of the metaclass, as far as I can tell.
 I think the following should work:

 from django.db import models

 class Plugin(models.base.ModelBase):
     def __init__(self, *args):
         super(Plugin, self).__init__(*args)
         self.per_class = []

 class BaseService(models.Model):
     class Meta:
         abstract = True

     __metaclass__ = Plugin

 class VirtualHost(BaseService):
     name = models.CharField(max_length=10)

 class SystemUser(BaseService):
     name = models.CharField(max_length=10)

 assert VirtualHost.per_class is not SystemUser.per_class

 But I have never worked with Django, and the approach based on dictionary
 lookup is less likely to interfere with the dark corners of the framework.

 Peter

Wow Peter, thanks for the correction, I've never used a metaclass
before :) With your correction seems that it works perfectly on
djando

 VirtualHost._plugin_registry.append('000')
 VirtualHost._plugin_registry
['000']
 SystemUser._plugin_registry
[]


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locale settings and date parsing under windows

[AlienBaby]

Hi,

I'm attempting to convert some date-time strings from a text file
under windows into a datetime object as returned by strptime()

However, the strings can represent dates in various formats based on
the country of origin, for example shortened month names etc.. are
different between countries.

I am trying to set the correct locale for strptime to work, but I'm
having a lot of trouble doing this under windows.


IE, wher the date is in the Danish Language,

import locale
locale.setlocale('LC_ALL',locale.normalize('da_DK'))

gives

locale.Error: unsupported locale string.

I have tried various ways but always hit the same error.

I understand setting LC_ALL may not be what I require, I was first
looking to simply get the locale setting correctly before I started
changing only the date-time specific elements.



Any help or pointers much appreciated. Current searching around is
revealing a fair amount of confusion..!


Thanks,

Matt.
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Re: IDLE: A cornicopia of mediocrity and obfuscation.

[flebber]

On Feb 1, 11:38 pm, rantingrick rantingr...@gmail.com wrote:
 On Feb 1, 4:20 am, flebber flebber.c...@gmail.com wrote:

  Sorry Rick too boringtrying to get bored people to bite at your
  ultra lame post yawn...

 Well reality and truth both has a tendency to be boring. Why? Well
 because we bathe in them daily. We have come accustomed, acclimated,
 and sadly complacent of the ill state of our stdlib. Yes, boring.
 However we must be aware of these things.

Yes but fixing idle just gives us another editor, there isn't a
shortage of editors. There is a shortage of a common community code
base for an ide framework, logical, reusable and extensible.

For an example of a brilliant beginners ide racket has it covered
with DrRacket http://racket-lang.org/ , it has selectable language
levels beginner, intermediate, advanced that allows the learner to
adjust the level of language features available as they learn,
teachpacks are installable to add extra features or options when
completing the tutorials(could easily be adapted to the python
tutorials). If idle is for teaching people to learn python shouldn't
it have the facility to do that?
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Re: Style question: Nicknames for deeply nested objects

[Jean-Michel Pichavant]

Gerald Britton wrote:


however, considering what

import a.module.that.is.quite.nested as myModule



Won't work since I get the objects at run time


  
myModule = __import__('whatever.module.imported.at.run.time', globals(), 
locals(), [], -1)


See http://docs.python.org/library/functions.html#__import__

JM


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Re: locale settings and date parsing under windows

[AlienBaby]

On Feb 3, 10:22 am, AlienBaby matt.j.war...@gmail.com wrote:
 Hi,

 I'm attempting to convert some date-time strings from a text file
 under windows into a datetime object as returned by strptime()

 However, the strings can represent dates in various formats based on
 the country of origin, for example shortened month names etc.. are
 different between countries.

 I am trying to set the correct locale for strptime to work, but I'm
 having a lot of trouble doing this under windows.

 IE, wher the date is in the Danish Language,

 import locale
 locale.setlocale('LC_ALL',locale.normalize('da_DK'))

 gives

 locale.Error: unsupported locale string.

 I have tried various ways but always hit the same error.

 I understand setting LC_ALL may not be what I require, I was first
 looking to simply get the locale setting correctly before I started
 changing only the date-time specific elements.

 Any help or pointers much appreciated. Current searching around is
 revealing a fair amount of confusion..!

 Thanks,

 Matt.

As often happens, writing that out and the working through a bit more,
I resolved my own question.

It ended up being a simple matter of translating from posix codes to
windows codes, so 'fr_FR' becomes 'French_France'...

thanks,

MAtt.
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Re: locale settings and date parsing under windows

[Martin P. Hellwig]

On 02/03/11 10:59, AlienBaby wrote:

On Feb 3, 10:22 am, AlienBabymatt.j.war...@gmail.com  wrote:

Hi,

I'm attempting to convert some date-time strings from a text file
under windows into a datetime object as returned by strptime()

However, the strings can represent dates in various formats based on
the country of origin, for example shortened month names etc.. are
different between countries.

I am trying to set the correct locale for strptime to work, but I'm
having a lot of trouble doing this under windows.

IE, wher the date is in the Danish Language,

import locale
locale.setlocale('LC_ALL',locale.normalize('da_DK'))

gives

locale.Error: unsupported locale string.

I have tried various ways but always hit the same error.

I understand setting LC_ALL may not be what I require, I was first
looking to simply get the locale setting correctly before I started
changing only the date-time specific elements.

Any help or pointers much appreciated. Current searching around is
revealing a fair amount of confusion..!

Thanks,

Matt.


As often happens, writing that out and the working through a bit more,
I resolved my own question.

It ended up being a simple matter of translating from posix codes to
windows codes, so 'fr_FR' becomes 'French_France'...

thanks,

MAtt.


You might also want to have a look at the contents of:
locale.locale_alias

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Re: locale settings and date parsing under windows

[AlienBaby]

On Feb 3, 12:13 pm, Martin P. Hellwig martin.hell...@dcuktec.org
wrote:
 On 02/03/11 10:59, AlienBaby wrote:





  On Feb 3, 10:22 am, AlienBabymatt.j.war...@gmail.com  wrote:
  Hi,

  I'm attempting to convert some date-time strings from a text file
  under windows into a datetime object as returned by strptime()

  However, the strings can represent dates in various formats based on
  the country of origin, for example shortened month names etc.. are
  different between countries.

  I am trying to set the correct locale for strptime to work, but I'm
  having a lot of trouble doing this under windows.

  IE, wher the date is in the Danish Language,

  import locale
  locale.setlocale('LC_ALL',locale.normalize('da_DK'))

  gives

  locale.Error: unsupported locale string.

  I have tried various ways but always hit the same error.

  I understand setting LC_ALL may not be what I require, I was first
  looking to simply get the locale setting correctly before I started
  changing only the date-time specific elements.

  Any help or pointers much appreciated. Current searching around is
  revealing a fair amount of confusion..!

  Thanks,

  Matt.

  As often happens, writing that out and the working through a bit more,
  I resolved my own question.

  It ended up being a simple matter of translating from posix codes to
  windows codes, so 'fr_FR' becomes 'French_France'...

  thanks,

  MAtt.

 You might also want to have a look at the contents of:
 locale.locale_alias

 --
 mph- Hide quoted text -

 - Show quoted text -

I did for a bit..

I tried, for example with French

from locale.locale_alias, you can find

'fr_FR' aliases to 'fr_FR.ISO8859-1'

but trying,

locale.setlocale(locale.LC_ALL,'fr_FR.ISO8859-1')

gives

locale.Error: unsupported locale setting


I'm now just using a handbuilt dict that holds translations like

'fr_FR' : 'French_France'
'da_DK' : 'Danish_Denmark'

etc..

Thanks,

MAtt.
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Re: IDLE: A cornicopia of mediocrity and obfuscation.

[Benjamin Kaplan]

On Thu, Feb 3, 2011 at 5:29 AM, flebber flebber.c...@gmail.com wrote:
 On Feb 1, 11:38 pm, rantingrick rantingr...@gmail.com wrote:
 On Feb 1, 4:20 am, flebber flebber.c...@gmail.com wrote:

  Sorry Rick too boringtrying to get bored people to bite at your
  ultra lame post yawn...

 Well reality and truth both has a tendency to be boring. Why? Well
 because we bathe in them daily. We have come accustomed, acclimated,
 and sadly complacent of the ill state of our stdlib. Yes, boring.
 However we must be aware of these things.

 Yes but fixing idle just gives us another editor, there isn't a
 shortage of editors. There is a shortage of a common community code
 base for an ide framework, logical, reusable and extensible.

 For an example of a brilliant beginners ide racket has it covered
 with DrRacket http://racket-lang.org/ , it has selectable language
 levels beginner, intermediate, advanced that allows the learner to
 adjust the level of language features available as they learn,
 teachpacks are installable to add extra features or options when
 completing the tutorials(could easily be adapted to the python
 tutorials). If idle is for teaching people to learn python shouldn't
 it have the facility to do that?

Python is a general purpose language that's designed to be easy to
use. Racket is a language that was designed for teaching programming.
It's almost exclusively tied to a single IDE. Something like language
levels would be impossible to do in Python unless you re-do the
parser. There's no feature that allows you to strip for loops or list
comprehensions out of the language. And we already have something
better than teachpacks- the import mechanism and the ability to
install 3rd party extensions.


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Re: locale settings and date parsing under windows

[python]

Matt,

 I'm now just using a handbuilt dict that holds translations like
 
 'fr_FR' : 'French_France'
 'da_DK' : 'Danish_Denmark'

What sources are you using for your dict keys and dict values? I'm
struggling with the same issue and I'm looking for master references for
both sets of code.

Thank you,
Malcolm
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Re: os.path.join doubt

[Westley Martínez]

'C:\\Users\\me\\Documents\\..\\Pictures\\images\\my.jpg' is a valid
path. .. means parent, not 'go back a directory'. But you should really
be trying this:

p1 = os.environ['HOMEPATH']
p2 = os.path.join(p1, 'Pictures', 'images', 'my.jpg')

On Wed, 2011-02-02 at 20:46 -0800, harryos wrote:

 In windows ,I tried this
 
 p1 = C:\Users\me\Documents
 p2 = ..\Pictures\images\my.jpg
 
 print os.path.join(p1,p2)
 This gives
 'C:\\Users\\me\\Documents\\..\\Pictures\\images\\my.jpg'
 
 I expected I would get
 'C:\\Users\\me\\Pictures\\images\\my.jpg'
 
 I thought os.path.join would join the paths more intelligently..Any
 idea why this happens ?
 harry
 
 


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Errors while using strip and remove on a variable.

[anand jeyahar]

Hi,
I am trying to strip a string and then remove on the resulting list to
remove a set of characters. It works fine with the python shell.

But after remove the list becomes None, when i am running it from within a
script.

I am guessing it has something to do with the way python handles assignment.
please find the script below*

a ='oe,eune,eueo, ,u'
b = a.split(',')
print b
c = b.remove('oe')
print a

print c


==
Anand Jeyahar
http://sites.google.com/a/cbcs.ac.in/students/anand
==
The man who is really serious,
with the urge to find out what truth is,
has no style at all. He lives only in what is.
  ~Bruce Lee

Love is a trade with lousy accounting policies.
 ~Aang Jie
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Re: Errors while using strip and remove on a variable.

[Benjamin Kaplan]

On Thu, Feb 3, 2011 at 10:21 AM, anand jeyahar anand.ibm...@gmail.com wrote:
 Hi,
     I am trying to strip a string and then remove on the resulting list to
 remove a set of characters. It works fine with the python shell.

 But after remove the list becomes None, when i am running it from within a
 script.

 I am guessing it has something to do with the way python handles assignment.
 please find the script below*

 a ='oe,eune,eueo, ,u'
 b = a.split(',')
 print b
 c = b.remove('oe')

The remove method of a list modifies the list in place and doesn't
return anything (Therefore, it returns None because every
function/method in Python has to return something). There's no need to
assign the result to a variable.
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Re: Errors while using strip and remove on a variable.

[Gary Herron]

On 02/03/2011 07:21 AM, anand jeyahar wrote:

Hi,
I am trying to strip a string and then remove on the resulting 
list to remove a set of characters. It works fine with the python shell.


But after remove the list becomes None, when i am running it from 
within a script.


I am guessing it has something to do with the way python handles 
assignment.

please find the script below*

a ='oe,eune,eueo, ,u'
b = a.split(',')
print b
c = b.remove('oe')
print a

print c




On a list, the remove method does not create and return a new list -- 
instead it removes the element from the list in place.In your code, 
you  print a and print c, but you should have done print b,  where 
you will find the result you expect.


Gary Herron




==
Anand Jeyahar
http://sites.google.com/a/cbcs.ac.in/students/anand
==
The man who is really serious,
with the urge to find out what truth is,
has no style at all. He lives only in what is.
  ~Bruce Lee

Love is a trade with lousy accounting policies.
 ~Aang Jie



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Re: Perl Hacker, Python Initiate

[Hrvoje Niksic]

Gary Chambers gwch...@gwcmail.com writes:

 Will someone please provide some insight on how to accomplish that
 task in Python?  I am unable to continually (i.e. it stops after
 displaying a single line) loop through the output while testing for
 the matches on the two regular expressions.  Thank you.

If I understand you correctly, here is the relevant part (untested):

import subprocess, collections

dig = subprocess.Popen([dig, ns.example.com, example.com, axfr],
   stdout=subprocess.PIPE).stdout

# defaultdict allows the equivalent of push @{$x{$y}}, $z
cnames = collections.defaultdict(list)
ip = {}

for line in dig:
if line.startswith(';'):
continue # Skip any comments
m = re.search(r'regexp1', line)
if m:
cnames[m.group(2)].append(m.group(1))  # push ...
m = re.search(r'regexp2', line)
if m:
ip[m.group(1)] = m.group(2)
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Re: os.path.join doubt

[Ethan Furman]

Steven D'Aprano wrote:
BTW, Windows accepts / as well as \ as a path separator. You will have 
far fewer headaches if you use that.


Just because Windows accepts / doesn't make it a good idea...

Python 2.5.4 (r254:67916, Dec 23 2008, 15:10:54) [MSC v.1310 32 bit 
(Intel)] on win32

Type help, copyright, credits or license for more information.
-- from glob import glob
-- print '\n'.join(glob('c:/temp/*'))
c:/temp\0C2O0007.TMP
c:/temp\27421
c:/temp\3K540007.TMP
c:/temp\AIF19780_01B_BACKUP.DBF
c:/temp\Arabic.bin
c:/temp\au-descriptor-1.6.0_23-b71.xml
c:/temp\AUCHECK_CORE.txt
c:/temp\AUCHECK_PARSER.txt
c:/temp\bar.py
c:/temp\bar.pyc
c:/temp\caller.py
c:/temp\caller.pyc
c:/temp\choose_python.pdf
c:/temp\CMD19639_B_BACKUP.DBF
c:/temp\COA.pdf
c:/temp\compress.py
c:/temp\compress.pyc
c:/temp\control.dbf
c:/temp\control.FPT

Or is there an option I'm missing so backslashes are not returned by 
stdlib functions?


~Ethan~
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Re: IDLE: A cornicopia of mediocrity and obfuscation.

[rantingrick]

On Feb 3, 4:29 am, flebber flebber.c...@gmail.com wrote:

 For an example of a brilliant beginners ide racket has it covered
 with DrRackethttp://racket-lang.org/, it has selectable language
 levels beginner, intermediate, advanced that allows the learner to
 adjust the level of language features available as they learn,
 teachpacks are installable to add extra features or options when
 completing the tutorials(could easily be adapted to the python
 tutorials). If idle is for teaching people to learn python shouldn't
 it have the facility to do that?

I think it would be a bad idea for us to follow in racket's footsteps.
Primarily because these sorts of handicapping of the language do not
actually help a new user. How is it going to help a beginner by
removing certain features? If you don't understand a certain feature
then removing the feature does not relieve the confusion. If the
philosophy breaks down to gentle learning curve then a properly
written tutorial is all you need. Ad Python has tons of them!

You should read some of Guido's anecdotes about the ABC language where
the developers attempted to change tried and tested terms to
something they thought would be less esoteric for Luddites to learn --
in the end all they accomplished was to propagate more confusion.
Multiplicity should never be a feature in programming languages...

 There should be one-- and preferably only one --obvious way to do it.

Actually some could argue that Python breaks this rule many times over
and they would be correct! However if you look at a language like Ruby
you quickly understand that we rather benign by comparison.

However i do believe that IDLE could use a few more beginner
enhancements. First, we need to clean up the code base. We cannot keep
bolting on features as an afterthought.
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Re: Perl Hacker, Python Initiate

[sturlamolden]

On 2 Feb, 05:36, Gary Chambers gwch...@gwcmail.com wrote:

 Given the following Perl script:

(...)

Let me quote the deceased Norwegian lisp hacker Erik Naggum:

Excuse me while I barf in Larry Wall's general direction.


Sturla

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Re: Perl Hacker, Python Initiate

[waku]

you've already got a hint on how to do it using library functions in
python.  below is a more literal suggestion.

On Feb 1, 10:36 pm, Gary Chambers gwch...@gwcmail.com wrote:
 All,

 Given the following Perl script:

 #!/usr/bin/perl

 %dig = (
      solaris = /usr/sbin/dig,
      linux   = /usr/bin/dig,
      darwin  = /usr/bin/dig
 );


dig = {solaris:/usr/sbin/dig, linux:/usr/bin/dig, darwin:/
usr/bin/dig}



 $DIG = $dig{$^O};

dig = dig[os.uname()[0].lower()]


 $DOMAIN = example.com;
 $DNS = ns.example.com;

domain, dns = ['%sexample.com'%p for p in ('', 'ns.')] # ;)

 $DIGCMD = qq/$DIG \@$DNS $DOMAIN axfr/;

digcmd = '%s @%s %s axfr' % (dig, dns, domain)


 open DIG, $DIGCMD| or die $DIG: $!\n;
 while (DIG) {
      next if (/^;/); # Skip any comments
      # If we match a CNAME record, we have an alias to something.
      # $1 = alias (CNAME), $2 = canonical hostname
      if (/^(\S+)\.${DOMAIN}\.\s+\d+\s+IN\s*CNAME\s+(\S+)\.${DOMAIN}\.$/) {
          # Push an alias (CNAME) onto an array indexed on canonical hostname
          push(@{$cnames{$2}}, $1);
      }
      # Here's a standard A (canonical hostname) record
      # $1 = canonical hostname, $2 = IPv4 address
      if (/^(\S+)\.${DOMAIN}\.\s+\d+\s+IN\s*A\s+(\S+)$/) {
          $ip{$1} = $2;
      }}

 close DIG;

lines = [line for line in os.popen(digcmd) if not re.match(';', line)]
cname, ip = [re.compile(s.format(domain))
for s in (r'(\S+)\.{0}\.\s+\d+\s+IN\s*CNAME\s+(\S+)\.{0}\.$', r'(\S
+)\.{0}\.\s+\d+\s+IN\s*A\s+(\S+)$')]
cnames, ips = [dict(m.groups() for m in (p.match(l) for l in lines) if
m) for p in cname, ip)]

the rest is left as an exercise.  i did not test this exact code
because i don't have your data, but a modified version works on
different data.

vQ


 # Format and display it like niscat hosts:
 # canonicalHostname alias1 [alias2 aliasN] ipAddress
 for $host (sort keys %ip) {
      print $host ;
      if (defined(@{$cnames{$host}})) {
          print join(' ', @{$cnames{$host}});
          print  ;
      }
      print $ip{$host}\n;}

 exit 0;

 Will someone please provide some insight on how to accomplish that task in
 Python?  I am unable to continually (i.e. it stops after displaying a single
 line) loop through the output while testing for the matches on the two
 regular expressions.  Thank you.

 -- Gary Chambers

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'Upload a valid image' errors with PIL 1.1.7/ Python 2.6/ Mac 10.6.2

[Anjali Arora]

Hi,

I am struggling with this for the past 2 days: first I got the above error,
 googled around to find that I needed the libjpeg module as well, so I
re-installed the lot, first libjpeg  then PIL; got a couple errors like
JPEG decoder not available etc, fixed that. Now it passes the selftest, but
when I try to upload images via the admin site, it throws up the error
Upload a valid image. The file you uploaded was either not an image or a
corrupted image.

Any help is appreciated. Thanks.
-Ara
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Re: Perl Hacker, Python Initiate

[Jorgen Grahn]

On Wed, 2011-02-02, Gary Chambers wrote:
 All,

 Given the following Perl script:

 #!/usr/bin/perl

I'm a Perl user, but I generally refuse to read Perl code which
doesn't utilize 'use warnings/-w' and 'use strict'.  There are just too
many crazy bugs and 1980s constructs which go unnoticed without them.

 %dig = (
  solaris = /usr/sbin/dig,
  linux   = /usr/bin/dig,
  darwin  = /usr/bin/dig
 );

Not related to your question, except that you'll have to deal with
this in Python too:

I really suggest letting the user's $PATH decide which dig to call.
/usr/bin is always in the path.  /usr/sbin may not be, but if that's a
problem for your users, just let your script start by appending it to
the pre-existing $PATH.  You don't even have to do OS detection on
that one -- it's safe to do everywhere.

/Jorgen

-- 
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\X/ snipabacken.se   O  o   .
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Fwd: 'Upload a valid image' errors with PIL 1.1.7/ Python 2.6/ Mac 10.6.2/ Django 1.2.3

[Anjali Arora]

I'm sorry, by admin site below, I mean Django Admin site.

Hi,

I am struggling with this for the past 2 days: first I got the above error,
 googled around to find that I needed the libjpeg module as well, so I
re-installed the lot, first libjpeg  then PIL; got a couple errors like
JPEG decoder not available etc, fixed that. Now it passes the selftest, but
when I try to upload images via the admin site, it throws up the error
Upload a valid image. The file you uploaded was either not an image or a
corrupted image.

Any help is appreciated. Thanks.
-Ara
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Re: Style question: Nicknames for deeply nested objects

[Jean-Michel Pichavant]

Gerald Britton wrote:



Nope. it's nothing to do with imports.  It's about objects passed to
methods at run time.  Complicated objects with many levels.  Not about
modules at all.
  


Who is providing these objects ?
- Your code ? = as said before, you can fix your design with a proper 
object model
- 3rd party libraries ? = I'd be curious to know which one, because 
they usually do a good job providing a clean minimal public interface.


However, do not redesign anything to get only shorter names. You can 
easily live with that, the way you're doing it is up to you and 
suggestions have been given. But keep in mind that you should'nt have 
got nested names that long in the first pace, no matter how complicated 
the internal implementation.


JM
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Re: IDLE: A cornicopia of mediocrity and obfuscation.

[rantingrick]

If anyone would like to see a good example of how IDLE code should be
written. I highly suggest you check out the source for PyShell and
PyCrust which is located in roughly...

HOME\PythonXX\Lib\site-packages\wx-2.8-msw-ansi\wx\py:
 * shell.py
 * crust.py
 * filling.py

Also run these scripts to see them all in action:
 * PyAlaCarte.py
 * PyAlaMode.py

This is a code base that was laid out in a logical and sensible
manner. This is a code base that can be built from. IDLE on the other
hand is utter chaos. If you don't believe me, first look at the
beautiful scripts i mentioned above, then check out these scripts in
your idlelib...

PythonXX\Lib\idlelib:
 * EditorWindow.py
 * PyShell.py

It is like night and day people!  NIGHT AND DAY!!!
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Re: Errors while using strip and remove on a variable.

[Stephen Hansen]

On 2/3/11 7:21 AM, anand jeyahar wrote:
 Hi,
 I am trying to strip a string and then remove on the resulting list
 to remove a set of characters. It works fine with the python shell.
 
 But after remove the list becomes None, when i am running it from within
 a script.
 
 I am guessing it has something to do with the way python handles assignment.
 please find the script below*
 
 a ='oe,eune,eueo, ,u'
 b = a.split(',')
 print b
 c = b.remove('oe')

As others have stated, the issue is that b.remove('oe') doesn't return b
or a copy of b, but directly modifies b instead.

I'll add that you will find that this behavior is consistent throughout
the list api: the None is more then just a default thing that's returned
when nothing else is returned, but in this case its also meant as a
signal to clearly indicate that the list is modified in-place.

Every once in awhile someone asks for these methods that modify the list
itself to either return self, or return a copy of the list -- and I'm
not going to get into that debate -- but the reason for the None is to
make it so you WILL get errors like the above.

You only run into this situation with mutable data-types by the way:
strings ALWAYS return a copy or new string, because they can't actually
modify the string itself.


-- 

   Stephen Hansen
   ... Also: Ixokai
   ... Mail: me+list/python (AT) ixokai (DOT) io
   ... Blog: http://meh.ixokai.io/



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socket.rcv timeout while-loop

[Dwayne Blind]

Hi everybody,

I am using Python 3.0.

I have such a code :
b=time.clock()
while time.clock()-b3 :
data=s.recv(1024)

However I would like to set timeout on the socket rcv method, so that the
while loop stops exactly after 3 seconds. Is this possible ?

Thanks a lot,
Dwayne
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Re: socket.rcv timeout while-loop

[Stephen Hansen]

On 2/3/11 9:56 AM, Dwayne Blind wrote:
 However I would like to set timeout on the socket rcv method, so that
 the while loop stops exactly after 3 seconds. Is this possible ?

I rarely do low-level socket stuff -- but I think s.settimeout() is what
you're looking for. It applies to the whole socket, and not just one
method -- so you may want to reset it after you're done recv'n.

-- 

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   ... Also: Ixokai
   ... Mail: me+list/python (AT) ixokai (DOT) io
   ... Blog: http://meh.ixokai.io/



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New article on grabbing city points from geonames, processing with Python, and rendering in MapPoint

[Eric Frost]

Add City Coverage to MapPoint using the GeoNames Database
by Richard Marsden
http://www.mapforums.com/add-city-coverage-mappoint-using-geonames-database-15244.html

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http://www.MP2Kmag.com
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Re: socket.rcv timeout while-loop

[Dwayne Blind]

Thanks for your answer. I don't want to reset my socket. I want to apply the
timeout to the rcv method only.

What about select ?

http://docs.python.org/library/select.html#select.select

How to implement it ?

Thanks a lot,
Dwayne

2011/2/3 Stephen Hansen me+list/pyt...@ixokai.io

 On 2/3/11 9:56 AM, Dwayne Blind wrote:
  However I would like to set timeout on the socket rcv method, so that
  the while loop stops exactly after 3 seconds. Is this possible ?

 I rarely do low-level socket stuff -- but I think s.settimeout() is what
 you're looking for. It applies to the whole socket, and not just one
 method -- so you may want to reset it after you're done recv'n.

 --

   Stephen Hansen
   ... Also: Ixokai
   ... Mail: me+list/python (AT) ixokai (DOT) io
   ... Blog: http://meh.ixokai.io/


 --
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Pydev 1.6.5 Released

[Fabio Zadrozny]

Hi All,

Pydev 1.6.5 has been released

Details on Pydev: http://pydev.org
Details on its development: http://pydev.blogspot.com

Release Highlights:
---

 * Syntax highlighting now has options to have {}, [] and () as well
as operators in different colors

 * Code generation for classes and methods:

 Note that this is an initial implementation of the idea, aimed as
those that use a TDD (Test Driven Development) approach,
 so, one can create the test first and generate the
classes/methods later on from using shortcuts or quick-fixes (which is
 something that those using JDT -- Java Development Tools -- in
Eclipse should be already familiar with). This feature
 should be already usable on a number of situations but it's still
far from being 100% complete.

 * Alt+Shift+S C can be used to create a class for the currently
selected token
 * Alt+Shift+S M can be used to create a method for the currently
selected token
 * Ctrl+1 has as a quick fix for creating a class or method

 * Debugger
 * When discovering encoding on Python 3.x, the file is opened as binary
 * Remote debugger (pydevd.settrace()) properly synchronized
 * Fixed debugger issue on interpreter shutdown on Python 2.7

 * Bug fixes:
 * Fixed issue when doing code-completion on a line that started
with some token that started with 'import'. e.g.: import_foo = a
 * Fixed import when running unittest with coverage
 * Fixed extract local (could extract to wrong location)
 * Fixed NPE when requesting print of arguments in the
context-information tooltips
 * Fixed AttributeError with pydevconsole on Python 3.x


What is PyDev?
---

PyDev is a plugin that enables users to use Eclipse for Python, Jython
and IronPython development -- making Eclipse a first class Python IDE
-- It comes with many goodies such as code completion, syntax
highlighting, syntax analysis, refactor, debug and many others.


Cheers,

-- 
Fabio Zadrozny
--
Software Developer

Aptana
http://aptana.com/

Pydev - Python Development Environment for Eclipse
http://pydev.org
http://pydev.blogspot.com
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Re: socket.rcv timeout while-loop

[Stephen Hansen]

On 2/3/11 10:13 AM, Dwayne Blind wrote:
 Thanks for your answer. I don't want to reset my socket. I want to apply
 the timeout to the rcv method only.

Setting the timeout does not reset [your] socket, I don't think. And I
get that you want to only timeout recv... that's why I pointed out its a
socket method, not an argument to recv. If you don't want it to apply to
everything else, you just have to be sure to change it back after recv.

Just:
  timeout = s.gettimeout()
  s.settimeout(3)
  s.recv(1024)
  s.settimeout(timeout)

Personally, I'd prefer to do:

with timeout(s, 3):
s.recv(1024)

That's a lot more clear, and I'd roll this context manager to accomplish it:

--- start

from contextlib import contextmanager

@contextmanager
def timeout(sock, timeout):
old_timeout = sock.gettimeout()
sock.settimeout(timeout)
try:
yield sock
finally:
sock.settimeout(old_timeout)

--- end

The contextmanager decorator is an easy/quick way of making a context
manager. Everything up until the yield is executed before the 'with'
block is run, and everything after the yield is executed after the
'with' block concludes.

If the with block throws an exception, it'll be catchable at the yield
point.

-- 

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   ... Also: Ixokai
   ... Mail: me+list/python (AT) ixokai (DOT) io
   ... Blog: http://meh.ixokai.io/



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ptrace vs. python-ptrace

[Grant Edwards]

I'd like to do some experimentation with the Linux ptrace facility.
Before I jump in, I was wondering if anybody has any comments they'd
like to offer on the relative merits of ptrace vs. python-ptrace:

  http://pypi.python.org/pypi/ptrace
  http://pypi.python.org/pypi/python-ptrace

Ptrace appears to have been updated more recently that python-ptrace,
but python-ptrace includes some sample applications that probably get
me closer to my end-goal.
  
Are the APIs compatible (or at all similar)?

-- 
Grant Edwards   grant.b.edwardsYow! On the road, ZIPPY
  at   is a pinhead without a
  gmail.compurpose, but never without
   a POINT.
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returning all matching groups with re.search()

[mhearne808[insert-at-sign-here]gmail[insert-dot-here]com]

Here's a scenario:

import re
m = re.search('e','fredbarneybettywilma')

Now, here's a stupid question:
why doesn't m.groups() return ('e','e','e').

I'm trying to figure out how to match ALL of the instances of a
pattern in one call - the group() and groups() return subgroups... how
do I get my search to get me all of the matching subgroups?
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Re: returning all matching groups with re.search()

[Chris Rebert]

On Thu, Feb 3, 2011 at 12:32 PM,
mhearne808[insert-at-sign-here]gmail[insert-dot-here]com
mhearne...@gmail.com wrote:
 Here's a scenario:

 import re
 m = re.search('e','fredbarneybettywilma')

 Now, here's a stupid question:
 why doesn't m.groups() return ('e','e','e').

Straight from the docs (http://docs.python.org/library/re.html ), emphasis mine:

re.search(pattern, string[, flags])
Scan through string looking for **a** location where the regular
expression pattern produces **a** match [...]

Hence, it stops looking after the very first match.

 I'm trying to figure out how to match ALL of the instances of a
 pattern in one call - the group() and groups() return subgroups... how
 do I get my search to get me all of the matching subgroups?

I think you want re.finditer() or re.findall().

Cheers,
Chris
--
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Re: returning all matching groups with re.search()

[Benjamin Kaplan]

On Thu, Feb 3, 2011 at 3:32 PM,
mhearne808[insert-at-sign-here]gmail[insert-dot-here]com
mhearne...@gmail.com wrote:
 Here's a scenario:

 import re
 m = re.search('e','fredbarneybettywilma')

 Now, here's a stupid question:
 why doesn't m.groups() return ('e','e','e').

 I'm trying to figure out how to match ALL of the instances of a
 pattern in one call - the group() and groups() return subgroups... how
 do I get my search to get me all of the matching subgroups?

m.groups() doesn't give return ('e','e','e') because groups don't mean
what you think they mean. Groups are subsections of a regular
expression, enclosed by parenthesis. For example:
 m = re.search('(e)','fredbarneybettywilma')
 m.groups()
('e',)

What you want seem to want is re.findall, not re.search
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JSONBOT 0.6.1 RELEASED

[Bart Thate]

Hello every human out there !

i'm pleased to announce the release of JSONBOT 0.6.1 FINAL, a release
that saw a lot of work into the shell side of things and no changes to
GAE.

0.6.1 has the following changes:

* the ! char is not used instead of | in a pipeline. This is to make
it easier to use a pipeline on mobile phones.

* a new commandline interface has been created. You can now do jsb
 .. no need to start up the console app when you have a single
command to execute

* ? is now used a query character, so things you learn the bot with !
learn can be queried with ?

* auto_register and guestasuser config options are now disabled by
default

* core xmpp parsing code has been rewritten

* many more bug fixes.

You can grab a copy of the code (tarball or mercurial repo) at
http://jsonbot.googlecode.com

Hope you enjoy this release as much as i enjoyed making it ;]
Have Fun !

Bart

About JOSNBOT:

JSONBOT is a remote event-driven framework for building bots that talk
JSON to each other over XMPP.

This distribution provides bots built on this framework for console,
IRC, XMPP for the shell and WWW and XMPP for the Google Application
engine.

JSONBOT is all of the following:

a shell console bot
a shell IRC bot
a shell XMPP bot
a Web bot running on Google Application Engine
a XMPP bot running on Google Application Engine
a Google Wave bot running op Google Application Engine
the XMPP bots are used to communicate between bots
plugin infrastructure to write your own functionality
event driven framework by the use of callbacks
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Download an attachment from an IMAP email

[Vincent Davis]

I have a few emails I am trying to download from my google account. I seem
to be getting the message but each of these messages have an attachment. I
don't understand what I ned to do to get and save the attachment to a local
file.
Here is what I have so far.
M = imaplib.IMAP4_SSL(IMAP_SERVER, IMAP_PORT)
rc, resp = M.login('x@', 'X')
print rc, resp
M.select('[Gmail]/All Mail')
M.search(None, 'FROM', 'some...@logitech.com')
#M.fetch(121, '(body[header.fields (subject)])')
M.fetch(121, '(RFC822)')

-- 
Thanks
Vincent Davis
720-301-3003
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Re: socket.rcv timeout while-loop

[Dwayne Blind]

Thanks Stephen. It's really nice of you.

I have not understood everything though. (I have never used a context
manager before.)

Here are some comments :

 timeout = s.gettimeout()# Is that the default timeout ?
 s.settimeout(3) # I guess this is a 3 second timeout
 s.recv(1024)
 s.settimeout(timeout) # You change it back ?

So with a while loop, it should be :

 timeout = s.gettimeout()
 s.settimeout(3)
 b=time.clock()
 while time.clock()-b3 :
  data=s.recv(1024)
 s.settimeout(timeout)

Am I right ?

Thanks again,
Dwayne


2011/2/3 Stephen Hansen me+list/pyt...@ixokai.io

 On 2/3/11 10:13 AM, Dwayne Blind wrote:
  Thanks for your answer. I don't want to reset my socket. I want to apply
  the timeout to the rcv method only.

 Setting the timeout does not reset [your] socket, I don't think. And I
 get that you want to only timeout recv... that's why I pointed out its a
 socket method, not an argument to recv. If you don't want it to apply to
 everything else, you just have to be sure to change it back after recv.

 Just:
  timeout = s.gettimeout()
  s.settimeout(3)
  s.recv(1024)
  s.settimeout(timeout)

 Personally, I'd prefer to do:

 with timeout(s, 3):
s.recv(1024)

 That's a lot more clear, and I'd roll this context manager to accomplish
 it:

 --- start

 from contextlib import contextmanager

 @contextmanager
 def timeout(sock, timeout):
old_timeout = sock.gettimeout()
sock.settimeout(timeout)
try:
yield sock
finally:
sock.settimeout(old_timeout)

 --- end

 The contextmanager decorator is an easy/quick way of making a context
 manager. Everything up until the yield is executed before the 'with'
 block is run, and everything after the yield is executed after the
 'with' block concludes.

 If the with block throws an exception, it'll be catchable at the yield
 point.

 --

   Stephen Hansen
   ... Also: Ixokai
   ... Mail: me+list/python (AT) ixokai (DOT) io
   ... Blog: http://meh.ixokai.io/


-- 
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Re: os.path.join doubt

[Steven D'Aprano]

On Thu, 03 Feb 2011 07:58:55 -0800, Ethan Furman wrote:

 Steven D'Aprano wrote:
 BTW, Windows accepts / as well as \ as a path separator. You will have
 far fewer headaches if you use that.
 
 Just because Windows accepts / doesn't make it a good idea...

No. Windows accepting slashes as the alternate path separator *enables* 
you to use slash. What makes it a good idea is that you don't have to 
worry about forgetting to escape backslashes:

 print(C:\temp\file.txt)
C:  emp
   ile.txt


Nor do you have to care about the fact that raw strings are designed for 
regular expressions, not Windows path names, and you can't have a raw 
string ending in a single backslash:

 location = r'C:\temp\'  # Path ending in a backslash.
  File stdin, line 1
location = r'C:\temp\'
 ^
SyntaxError: EOL while scanning string literal


The fact is that Windows' use of backslash as the path separator 
conflicts with Python's use of backslashes. Since our code is written in 
Python, trying to uses backslashes causes problems. One work-around is to 
take advantage of the fact that Windows has an alternate separator 
character, and use that. If you'd rather use raw strings, and special-
case backslashes at the end of paths, go right ahead.

 -- from glob import glob
 -- print '\n'.join(glob('c:/temp/*')) c:/temp\0C2O0007.TMP
 c:/temp\27421
 c:/temp\3K540007.TMP
[...]


Yes. Is there a problem? All those paths should be usable from Windows. 
If you find it ugly to see paths with a mix of backslashes and forward 
slashes, call os.path.normpath, or just do a simple string replace:

path = path.replace('/', '\\')

before displaying them to the user. Likewise if you have to pass the 
paths to some application that doesn't understand slashes.


-- 
Steven
-- 
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Re: socket.rcv timeout while-loop

[Dwayne Blind]

The solution would be

 timeout = s.gettimeout()
 s.settimeout(3)
 b=time.clock()
 while time.clock()-b3 :
  try :
   data=s.recv(1024)
  except :
   break
 s.settimeout(timeout)

Am I right ?

Dwayne

2011/2/4 Dwayne Blind dwaynebl...@gmail.com

 Thanks Stephen. It's really nice of you.

 I have not understood everything though. (I have never used a context
 manager before.)

 Here are some comments :

  timeout = s.gettimeout()# Is that the default timeout ?
  s.settimeout(3) # I guess this is a 3 second timeout
  s.recv(1024)
  s.settimeout(timeout) # You change it back ?

 So with a while loop, it should be :


  timeout = s.gettimeout()
  s.settimeout(3)
  b=time.clock()
  while time.clock()-b3 :

   data=s.recv(1024)
  s.settimeout(timeout)

 Am I right ?

 Thanks again,
 Dwayne


 2011/2/3 Stephen Hansen me+list/pyt...@ixokai.io

 On 2/3/11 10:13 AM, Dwayne Blind wrote:

  Thanks for your answer. I don't want to reset my socket. I want to apply
  the timeout to the rcv method only.

 Setting the timeout does not reset [your] socket, I don't think. And I
 get that you want to only timeout recv... that's why I pointed out its a
 socket method, not an argument to recv. If you don't want it to apply to
 everything else, you just have to be sure to change it back after recv.

 Just:
  timeout = s.gettimeout()
  s.settimeout(3)
  s.recv(1024)
  s.settimeout(timeout)

 Personally, I'd prefer to do:

 with timeout(s, 3):
s.recv(1024)

 That's a lot more clear, and I'd roll this context manager to accomplish
 it:

 --- start

 from contextlib import contextmanager

 @contextmanager
 def timeout(sock, timeout):
old_timeout = sock.gettimeout()
sock.settimeout(timeout)
try:
yield sock
finally:
sock.settimeout(old_timeout)

 --- end

 The contextmanager decorator is an easy/quick way of making a context
 manager. Everything up until the yield is executed before the 'with'
 block is run, and everything after the yield is executed after the
 'with' block concludes.

 If the with block throws an exception, it'll be catchable at the yield
 point.

 --

   Stephen Hansen
   ... Also: Ixokai
   ... Mail: me+list/python (AT) ixokai (DOT) io
   ... Blog: http://meh.ixokai.io/



-- 
http://mail.python.org/mailman/listinfo/python-list

Re: os.path.join doubt

[Westley Martínez]

On Thu, 2011-02-03 at 23:11 +, Steven D'Aprano wrote:

 On Thu, 03 Feb 2011 07:58:55 -0800, Ethan Furman wrote:
 
  Steven D'Aprano wrote:
  BTW, Windows accepts / as well as \ as a path separator. You will have
  far fewer headaches if you use that.
  
  Just because Windows accepts / doesn't make it a good idea...
 
 No. Windows accepting slashes as the alternate path separator *enables* 
 you to use slash. What makes it a good idea is that you don't have to 
 worry about forgetting to escape backslashes:
 
  print(C:\temp\file.txt)
 C:  emp
ile.txt
 
 
 Nor do you have to care about the fact that raw strings are designed for 
 regular expressions, not Windows path names, and you can't have a raw 
 string ending in a single backslash:
 
  location = r'C:\temp\'  # Path ending in a backslash.
   File stdin, line 1
 location = r'C:\temp\'
  ^
 SyntaxError: EOL while scanning string literal
 
 
 The fact is that Windows' use of backslash as the path separator 
 conflicts with Python's use of backslashes. Since our code is written in 
 Python, trying to uses backslashes causes problems. One work-around is to 
 take advantage of the fact that Windows has an alternate separator 
 character, and use that. If you'd rather use raw strings, and special-
 case backslashes at the end of paths, go right ahead.
 
  -- from glob import glob
  -- print '\n'.join(glob('c:/temp/*')) c:/temp\0C2O0007.TMP
  c:/temp\27421
  c:/temp\3K540007.TMP
 [...]
 
 
 Yes. Is there a problem? All those paths should be usable from Windows. 
 If you find it ugly to see paths with a mix of backslashes and forward 
 slashes, call os.path.normpath, or just do a simple string replace:
 
 path = path.replace('/', '\\')
 
 before displaying them to the user. Likewise if you have to pass the 
 paths to some application that doesn't understand slashes.
 
 
 -- 
 Steven

Paths that mix /s and \s are NOT valid on Windows. In one of the
setup.py scripts I wrote I had to write a function to collect the paths
of data files for installation. On Windows it didn't work and it was
driving me crazy. It wasn't until I realized os.path.join was joining
the paths with \\ instead of / that I was able to fix it.

def find_package_data(path):
Recursively collect EVERY file in path to a list.
oldcwd = os.getcwd()
os.chdir(path)
filelist = []
for path, dirs, filenames in os.walk('.'):
for name in filenames:
filename = ((os.path.join(path, name)).replace('\\', '/'))
filelist.append(filename.replace('./', 'data/'))
os.chdir(oldcwd)
return filelist
-- 
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Re: os.path.join doubt

[Thomas L. Shinnick]

At 05:33 PM 2/3/2011, Westley Martínez wrote:

On Thu, 2011-02-03 at 23:11 +, Steven D'Aprano wrote:

On Thu, 03 Feb 2011 07:58:55 -0800, Ethan Furman wrote:
 Steven D'Aprano wrote:
[snip]

Yes. Is there a problem? All those paths should be usable from Windows.
If you find it ugly to see paths with a mix of backslashes and forward
slashes, call os.path.normpath, or just do a simple string replace:

path = path.replace('/', '\\')

before displaying them to the user. Likewise if you have to pass the
paths to some application that doesn't understand slashes.


--
Steven
Paths that mix /s and \s are NOT valid on 
Windows. In one of the setup.py scripts I wrote 
I had to write a function to collect the paths 
of data files for installation. On Windows it 
didn't work and it was driving me crazy. It 
wasn't until I realized os.path.join was joining 
the paths with \\ instead of / that I was able to fix it.


def find_package_data(path):
Recursively collect EVERY file in path to a list.
oldcwd = os.getcwd()
os.chdir(path)
filelist = []
for path, dirs, filenames in os.walk('.'):
for name in filenames:
filename = ((os.path.join(path, name)).replace('\\', '/'))
filelist.append(filename.replace('./', 'data/'))
os.chdir(oldcwd)
return filelist


Please check out os.path.normpath() as suggested.  Example:
 import os
 s = r/hello\\there//yall\\foo.bar
 s
'/hellothere//yallfoo.bar'
 v = os.path.normpath(s)
 v
'\\hello\\there\\yall\\foo.bar'

The idea behind os.path is to cater to the host 
OS.  Thus os.path.normpath() will convert to the 
host's acceptable delimiters.  That is, you 
didn't need the .replace(), but rather to more 
fully use the existing library to good advantage with .normpath().


However, note that delimiters becomes an issue 
only when directly accessing the host OS, such as 
when preparing command line calls or accessing 
native APIs.  Within the Python 
library/environment, both '/' and '\' are 
acceptable.  External use is a different matter.


So, you need to be specific on how and where your 
paths are to be used. For instance os.chdir() 
will work fine with a mixture, but command line 
apps or native APIs will probably fail.
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8-Day Python Power Course in Leipzig/Germany

[Mike Müller]

Eight Days of Python Training
-

Can't get enough of Python? Then this course is for you.
A three day introduction to Python as a warm-up, followed by five
days of advanced Python training. All courses given in English.

May 13 - 15, 2011  Python for Programmers
May 16 - 20, 2011  Python Power Course
   May 16, 2011   Advanced Python Programming
   May 17, 2011   Optimizing Python Programs
   May 18, 2011   Python Extensions with Other Languages
   May 19, 2011   Fast Code with the Cython Compiler
   May 20, 2011   High Performance XML with Python

Venue: Python Academy, Leipzig, Germany
Trainers: Mike Müller, Stefan Behnel

About the Trainers
--

Mike Müller, Ph.D has been teaching Python since 2004. He is the
founder of Python Academy and regularly gives open and in-house
Python courses as well as tutorials at PyCon US, OSCON, EuroSciPy
and PyCon Asia-Pacific.

Stefan Behnel, Ph.D is Senior Software Developer at Senacor Technologies AG
as well as freelance consultant and software developer specializing
in Python and Open Source. He is core developer of both the Cython compiler
and the lxml XML toolkit.

More Information


http://www.python-academy.com/courses/python_power_course.html

--
Mike
mmuel...@python-academy.de
--
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Re: os.path.join doubt

[Westley Martínez]

On Thu, 2011-02-03 at 17:57 -0600, Thomas L. Shinnick wrote:

 At 05:33 PM 2/3/2011, Westley Martínez wrote:
 
  On Thu, 2011-02-03 at 23:11 +, Steven D'Aprano wrote: 
  
   On Thu, 03 Feb 2011
   07:58:55 -0800, Ethan Furman wrote:
Steven D'Aprano wrote:
   [snip]
   
   Yes. Is there a problem? All those paths should be usable from Windows. 
   If you find it ugly to see paths with a mix of backslashes and forward 
   slashes, call os.path.normpath, or just do a simple string replace:
   
   path = path.replace('/', '\\')
   
   before displaying them to the user. Likewise if you have to pass the 
   paths to some application that doesn't understand slashes.
   
   
   -- 
   Steven
  
  Paths that mix /s and \s are NOT valid on Windows. In one of the
  setup.py scripts I wrote I had to write a function to collect the
  paths of data files for installation. On Windows it didn't work and
  it was driving me crazy. It wasn't until I realized os.path.join was
  joining the paths with \\ instead of / that I was able to fix it.
  
  def find_package_data(path):
  Recursively collect EVERY file in path to a list.
  oldcwd = os.getcwd()
  os.chdir(path)
  filelist = []
  for path, dirs, filenames in os.walk('.'):
  for name in filenames:
  filename = ((os.path.join(path, name)).replace('\\',
  '/'))
  filelist.append(filename.replace('./', 'data/'))
  os.chdir(oldcwd)
  return filelist 
 
 
 Please check out os.path.normpath() as suggested.  Example:
  import os
  s = r/hello\\there//yall\\foo.bar
  s
 '/hellothere//yallfoo.bar'
  v = os.path.normpath(s)
  v
 '\\hello\\there\\yall\\foo.bar'
 
 The idea behind os.path is to cater to the host OS.  Thus
 os.path.normpath() will convert to the host's acceptable delimiters.
 That is, you didn't need the .replace(), but rather to more fully use
 the existing library to good advantage with .normpath().
 
 However, note that delimiters becomes an issue only when directly
 accessing the host OS, such as when preparing command line calls or
 accessing native APIs.  Within the Python library/environment, both
 '/' and '\' are acceptable.  External use is a different matter.
 
 So, you need to be specific on how and where your paths are to be
 used. For instance os.chdir() will work fine with a mixture, but
 command line apps or native APIs will probably fail.

The reason why I use replace instead of normpath is because I want it to
'/'s on ALL platforms. This is because distutils requires the use of
'/'s.
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Re: socket.rcv timeout while-loop

[Dwayne Blind]

or rather

 timeout = s.gettimeout()
 b=time.clock()
 while time.clock()-b3 :
  s.settimeout(3-time.clock()+b)
   try :
   data=s.recv(1024)
  except :
   break
 s.settimeout(timeout)

Sorry for all these messages

Dwayne


2011/2/4 Dwayne Blind dwaynebl...@gmail.com

 The solution would be


  timeout = s.gettimeout()
  s.settimeout(3)
  b=time.clock()
  while time.clock()-b3 :
try :
data=s.recv(1024)
   except :
break
  s.settimeout(timeout)

 Am I right ?

 Dwayne

 2011/2/4 Dwayne Blind dwaynebl...@gmail.com

 Thanks Stephen. It's really nice of you.

 I have not understood everything though. (I have never used a context
 manager before.)

 Here are some comments :

  timeout = s.gettimeout()# Is that the default timeout ?
  s.settimeout(3) # I guess this is a 3 second timeout
  s.recv(1024)
  s.settimeout(timeout) # You change it back ?

 So with a while loop, it should be :


  timeout = s.gettimeout()
  s.settimeout(3)
  b=time.clock()
  while time.clock()-b3 :

   data=s.recv(1024)
  s.settimeout(timeout)

 Am I right ?

 Thanks again,
 Dwayne


 2011/2/3 Stephen Hansen me+list/pyt...@ixokai.io

 On 2/3/11 10:13 AM, Dwayne Blind wrote:

  Thanks for your answer. I don't want to reset my socket. I want to
 apply
  the timeout to the rcv method only.

 Setting the timeout does not reset [your] socket, I don't think. And I
 get that you want to only timeout recv... that's why I pointed out its a
 socket method, not an argument to recv. If you don't want it to apply to
 everything else, you just have to be sure to change it back after recv.

 Just:
  timeout = s.gettimeout()
  s.settimeout(3)
  s.recv(1024)
  s.settimeout(timeout)

 Personally, I'd prefer to do:

 with timeout(s, 3):
s.recv(1024)

 That's a lot more clear, and I'd roll this context manager to accomplish
 it:

 --- start

 from contextlib import contextmanager

 @contextmanager
 def timeout(sock, timeout):
old_timeout = sock.gettimeout()
sock.settimeout(timeout)
try:
yield sock
finally:
sock.settimeout(old_timeout)

 --- end

 The contextmanager decorator is an easy/quick way of making a context
 manager. Everything up until the yield is executed before the 'with'
 block is run, and everything after the yield is executed after the
 'with' block concludes.

 If the with block throws an exception, it'll be catchable at the yield
 point.

 --

   Stephen Hansen
   ... Also: Ixokai
   ... Mail: me+list/python (AT) ixokai (DOT) io
   ... Blog: http://meh.ixokai.io/




-- 
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Re: socket.rcv timeout while-loop

[Stephen Hansen]

On 2/3/11 3:02 PM, Dwayne Blind wrote:
 Thanks Stephen. It's really nice of you.
 
 I have not understood everything though. (I have never used a context
 manager before.)
 
 Here are some comments :
 
  timeout = s.gettimeout()# Is that the default timeout ?
  s.settimeout(3) # I guess this is a 3 second timeout
  s.recv(1024)
  s.settimeout(timeout) # You change it back ?

Yes.

 So with a while loop, it should be :

I don't understand why you're doing this while loop business. Your
original question is asking for how to NOT do that, I thought. How to
use a timeout instead.

I showed you how to use a timeout instead-- now you're mixing it in with
what you originally had? Why?



-- 

   Stephen Hansen
   ... Also: Ixokai
   ... Mail: me+list/python (AT) ixokai (DOT) io
   ... Blog: http://meh.ixokai.io/



signature.asc
Description: OpenPGP digital signature
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Re: Download an attachment from an IMAP email

[Kushal Kumaran]

On Fri, Feb 4, 2011 at 3:44 AM, Vincent Davis vinc...@vincentdavis.net wrote:
 I have a few emails I am trying to download from my google account. I seem
 to be getting the message but each of these messages have an attachment. I
 don't understand what I ned to do to get and save the attachment to a local
 file.
 Here is what I have so far.
 M = imaplib.IMAP4_SSL(IMAP_SERVER, IMAP_PORT)
 rc, resp = M.login('x@', 'X')
 print rc, resp
 M.select('[Gmail]/All Mail')
 M.search(None, 'FROM', 'some...@logitech.com')
 #M.fetch(121, '(body[header.fields (subject)])')
 M.fetch(121, '(RFC822)')

Take a look at the email module.  The message_from_string() function
can convert the string representation of the email (as obtained by
M.fetch(121, '(RFC822)') into a message object.

-- 
regards,
kushal
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code structure advise for a model

[Martin De Kauwe]

Hi,

I am translating some c++ code to python and just wanted to ask some
advise on structure. The original has everything declared globally and
nothing passed via function (I assume, but don't know, that this isn't
just standard c++ practice!). So given this, I have a pretty much
clean slate as I can't quite just copy the functions over. I was
thinking something like this

class Params:

def __init__(self, fname):
self.set_inital_condtions()
self.read_input_file(fname)

def set_inital_conditons(self):
self.some_parm = 0.0


def read_input_file(fname):

#read file, change initial params if specified


then I thought I could pass this as an object to the model class

class Model(Params):

def __init__(self):
# blah

def some_func(self):
 if (Params.some_param == something):
 foo

OR this just a very bad way to structure it?

The other thing I can't decide on is how to pass the parameters and
variables through the class. So because of the way the original is
written (everything is global), I could just inherit things, but it
does means there is a lot of self. syntax. So I wondered if it might
be better to pass things as function arguments? Any thoughts? I am
also half considering other users from non-python backgrounds and what
might seem very alien (syntax) to them.

thanks in advance

(ps. I am cross posting this on comp.lang.python as I am not sure
where is more appropriate).
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Re: socket.rcv timeout while-loop

[Dave Angel]

On 01/-10/-28163 02:59 PM, Dwayne Blind wrote:

or rather

  timeout = s.gettimeout()
  b=time.clock()
  while time.clock()-b3 :
   s.settimeout(3-time.clock()+b)
try :
data=s.recv(1024)
   except :
break
  s.settimeout(timeout)

Sorry for all these messages

Dwayne



You accidentally top-posted, so I had to delete all the history.

Without knowing anything about s, there are two problems with this logic:

1) if you loop through the while more than once, you'll be throwing out 
old data.  So you might need something like  data += s.recv(1024). 
Conversely, if an exception happens, data is completely undefined. 
Without defining a default value, your remaining code is likely to get 
an exception.


2) Your time spent might vary between 3 and 6 seconds.  If you need a 
tighter control than that, play with the timeout a little.  For example, 
you might want a 1/2 second timeout, and loop until the total is 3 
seconds.  That way the tolerance will be 3 to 3.5 seconds.


Bonus:  I don't know the behavior of the object, so I don't know what 
state it's in after you timeout.


DaveA

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[issue7678] subprocess.Popen pipeline example code in the documentation is lacking

[Ross Lagerwall]

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

The docs should be updated. This has been noted in msg54949 and 
http://www.enricozini.org/2009/debian/python-pipes/

Perhaps this example will make it clear:
import subprocess

p1 = subprocess.Popen([yes], stdout=subprocess.PIPE)
p2 = subprocess.Popen([head], stdin=p1.stdout, stdout=subprocess.PIPE)
#p1.stdout.close()
p1.wait()

This example hangs. yes writes to head and head reads the first 10 lines 
and then exits. But, yes does not receive a SIGPIPE because the python 
process still has a p1.stdout open. Thus, p1.stdout should be closed after 
being passed to p2.

--
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[issue11098] syntax error at end of line in interactive python -u

[Alexey Luchko]

Alexey Luchko l...@ank-sia.com added the comment:

I reported the issue just because I didn't find it is already known.
I don't think it is worth backporting.

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[issue11079] Make OS X entry in Applications like that in Windows

[Ned Deily]

Ned Deily n...@acm.org added the comment:

After discussions with Raymond, I now agree that it would be better to not copy 
the Tools into the Applications/Python 3.x directory since everything else 
there is of the double-clickable nature, i.e. aimed at the user more 
comfortable with a GUI interface.  Since the Tools files may be of interest to 
advanced command-line users, a better place for them is within the framework 
share directory as many other UNIX-like distributions install them in 
/usr/share.

The following two patches implement the following changes from 3.2rc2 OS X 
installer behavior.

issue11079_extras_py3k.patch:

1. modifies the Mac Makefile installextras target to put a copy of Tools/ in 
the framework at share/doc/pythonm.n/examples rather than in 
/Applications/Python m.n

2. updates the installer ReadMe file accordingly.

issue11079_doc_links.patch

3. places a link named Python Documentation.html in /Applications/Python m.n 
to the top-level index.html file of the installed documentation set.

4. places a link to the documentation directory in the framework at 
share/doc/pythonm.n/html

Summary of installed file differences:

/Applications/Python m.s/
  Extras/
2.7/3.1: contained ReadMe and old Demo directories
3.2rc2: contained Tools directory (note 1 below)
3.2: no longer created
  Python Documentation.html
2.7/3.1/3.2rc2: not created
3.2: symlink to index page of standard documentation:
   /Library/Frameworks/Python.framework/Versions/3.2/\
 Resources/English.lproj/Documentation/index.html

/Library/Frameworks/Python.framework/Versions/m.n/
  share/doc/pythonm.n/examples
2.7/3.1/3.2rc2: not created
3.2: contains Tools directory
  share/doc/pythonm.n/html
2.7/3.1/3.2rc1: not created
3.2: relative symlink to standard documentation location:
   ../../../Resources/English.lproj/Documentation

The included changes affect only the Mac installer script and the Mac Makefile. 
 Both variants of the installer were built with these fixes and tested on 10.5 
and 10.6 as appropriate.  If after review, the patches meet expectations, I ask 
for release manager approval to apply for 3.2final.


Note 1: If the user had installed one of the Python 3.2rc installers, the 
Extras directory and its contents will not be removed by the 3.2final installer.

Note 2: The additional documentation links should also be backported to 2.7.

--
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nosy: +georg.brandl
priority: normal - critical
stage:  - commit review
Added file: http://bugs.python.org/file20661/issue11079_doc_links.patch

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[issue11079] Make OS X entry in Applications like that in Windows

[Ned Deily]

Changes by Ned Deily n...@acm.org:


Added file: http://bugs.python.org/file20662/issue11079_extras_py3k.patch

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[issue10227] Improve performance of MemoryView slicing

[Stefan Behnel]

Stefan Behnel sco...@users.sourceforge.net added the comment:

Here are some real micro benchmarks (note that the pybench benchmarks actually 
do lots of other stuff besides slicing):

base line:

$ ./python -m timeit -s 'l = list(range(100)); s=slice(None)' 'l[s]'
100 loops, best of 3: 0.464 usec per loop
$ ./python -m timeit -s 'l = list(range(10)); s=slice(None)' 'l[s]'
1000 loops, best of 3: 0.149 usec per loop
$ ./python -m timeit -s 'l = list(range(10)); s=slice(None,1)' 'l[s]'
1000 loops, best of 3: 0.135 usec per loop


patched:

$ ./python -m timeit -s 'l = list(range(100))' 'l[:1]'
1000 loops, best of 3: 0.158 usec per loop
$ ./python -m timeit -s 'l = list(range(100))' 'l[:]'
100 loops, best of 3: 0.49 usec per loop
$ ./python -m timeit -s 'l = list(range(100))' 'l[1:]'
100 loops, best of 3: 0.487 usec per loop
$ ./python -m timeit -s 'l = list(range(100))' 'l[1:3]'
1000 loops, best of 3: 0.184 usec per loop

$ ./python -m timeit -s 'l = list(range(10))' 'l[:]'
1000 loops, best of 3: 0.185 usec per loop
$ ./python -m timeit -s 'l = list(range(10))' 'l[1:]'
1000 loops, best of 3: 0.181 usec per loop


original:

$ ./python -m timeit -s 'l = list(range(100))' 'l[:1]'
1000 loops, best of 3: 0.171 usec per loop
$ ./python -m timeit -s 'l = list(range(100))' 'l[:]'
100 loops, best of 3: 0.499 usec per loop
$ ./python -m timeit -s 'l = list(range(100))' 'l[1:]'
100 loops, best of 3: 0.509 usec per loop
$ ./python -m timeit -s 'l = list(range(100))' 'l[1:3]'
1000 loops, best of 3: 0.198 usec per loop

$ ./python -m timeit -s 'l = list(range(10))' 'l[:]'
1000 loops, best of 3: 0.188 usec per loop
$ ./python -m timeit -s 'l = list(range(10))' 'l[1:]'
100 loops, best of 3: 0.196 usec per loop


So the maximum impact seems to be 8% for very short slices (10) and it quickly 
goes down for longer slices where the copy impact clearly dominates. There's 
still some 2% for 100 items, though.

I find it interesting that the base line is way below the other timings. That 
makes me think it's actually worth caching constant slice instances, as CPython 
already does for tuples. Cython also caches both now. I would expect that 
constant slices like [:], [1:] or [:-1] are extremely common. As you can see 
above, caching them could speed up slicing by up to 30% for short lists, and 
still some 7% for a list of length 100.

Stefan

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[issue11079] Make OS X entry in Applications like that in Windows

[Ned Deily]

Changes by Ned Deily n...@acm.org:


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[issue10227] Improve performance of MemoryView slicing

[Stefan Behnel]

Stefan Behnel sco...@users.sourceforge.net added the comment:

Here's another base line test: slicing an empty list

patched:

$ ./python -m timeit -s 'l = []' 'l[:]'
1000 loops, best of 3: 0.0847 usec per loop

original:

$ ./python -m timeit -s 'l = []' 'l[:]'
1000 loops, best of 3: 0.0977 usec per loop

That's about 13% less overhead.

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[issue10227] Improve performance of MemoryView slicing

[Antoine Pitrou]

Antoine Pitrou pit...@free.fr added the comment:

 I find it interesting that the base line is way below the other
 timings. That makes me think it's actually worth caching constant
 slice instances, as CPython already does for tuples.

Indeed. I have never touched it, but I suppose it needs an upgrade of
the marshal format to support slices.
(of course, this will not help for other common cases such as l[x:x+2]).

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[issue1757072] Zipfile robustness

[Ernst Sjöstrand]

Changes by Ernst Sjöstrand ern...@gmail.com:


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[issue11098] syntax error at end of line in interactive python -u

[R. David Murray]

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

Great.  Thanks for reporting it, and I'm glad we managed to already have it 
fixed :)

--
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stage:  - committed/rejected
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[issue11087] Speeding up the interpreter with a few lines of code

[Antoine Pitrou]

Antoine Pitrou pit...@free.fr added the comment:

Ok, things are at best 3-4% faster here (often unchanged).

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[issue10227] Improve performance of MemoryView slicing

[Stefan Behnel]

Stefan Behnel sco...@users.sourceforge.net added the comment:

 of course, this will not help for other common cases such as l[x:x+2]

... which is exactly what this slice caching patch is there for. ;-)

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[issue10227] Improve performance of MemoryView slicing

[Stefan Behnel]

Stefan Behnel sco...@users.sourceforge.net added the comment:

A quick test against the py3k stdlib:

find -name *.py | while read file; do egrep '\[[-0-9]*:[-0-9]*\]' $file; 
done | wc -l

This finds 2096 lines in 393 files.

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[issue11105] Compiling evil ast crashes interpreter

[Alexander Belopolsky]

Alexander Belopolsky belopol...@users.sourceforge.net added the comment:

Looks like a stack overflow caused by an infinite recursion.  I am not sure if 
it is possible to add cycle detection code without sacrificing performance or 
setting some arbitrary limits.

I wonder: Why ast nodes need to be mutable?

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[issue11105] Compiling evil ast crashes interpreter

[Benjamin Peterson]

Benjamin Peterson benja...@python.org added the comment:

2011/2/3 Alexander Belopolsky rep...@bugs.python.org:

 Alexander Belopolsky belopol...@users.sourceforge.net added the comment:

 Looks like a stack overflow caused by an infinite recursion.  I am not sure 
 if it is possible to add cycle detection code without sacrificing performance 
 or setting some arbitrary limits.

Yes, it's definitely low priority. It's probably easier to crash the
interpreter by producing differently malformed ast anyway.


 I wonder: Why ast nodes need to be mutable?

So people can change them.

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[issue11105] Compiling evil ast crashes interpreter

[Alexander Belopolsky]

Alexander Belopolsky belopol...@users.sourceforge.net added the comment:

On Thu, Feb 3, 2011 at 12:08 PM, Benjamin Peterson
rep...@bugs.python.org wrote:
..
 I wonder: Why ast nodes need to be mutable?

 So people can change them.

Well, they are hashable, so this needs to be done carefully.  Is this
necessary for AST-based optimizations?  Does Python actually change
AST after it has been created?  Note that for some optimizations it
may be more appropriate to build a new tree rather than mutate the old
one.  Depending on the algorithm, you may or may not need to change
the nodes after they have been created in the process.

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[issue11105] Compiling evil ast crashes interpreter

[Benjamin Peterson]

Benjamin Peterson benja...@python.org added the comment:

2011/2/3 Alexander Belopolsky rep...@bugs.python.org:

 Alexander Belopolsky belopol...@users.sourceforge.net added the comment:

 On Thu, Feb 3, 2011 at 12:08 PM, Benjamin Peterson
 rep...@bugs.python.org wrote:
 ..
 I wonder: Why ast nodes need to be mutable?

 So people can change them.

 Well, they are hashable, so this needs to be done carefully.  Is this
 necessary for AST-based optimizations?  Does Python actually change
 AST after it has been created?  Note that for some optimizations it
 may be more appropriate to build a new tree rather than mutate the old
 one.  Depending on the algorithm, you may or may not need to change
 the nodes after they have been created in the process.

Other people are, though. The hash is by identity anyway.

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[issue11106] python 2.6.6 and python 2.7.1 cannot be built successfully because of an segment fault on NetBSD-5.1-sparc

[H Xu]

New submission from H Xu xuh...@gmail.com:

Build python 2.6.6 and python 2.7.1 on a NetBSD-5.1-sparc machine.

1. Run './configure';
2. Run 'make';
3. Run 'make install'.

There will be a problem after run 'make install'.
The last few lines of error messages are like the following:

Compiling /usr/local/lib/python2.6/test/test_binop.py ...
Compiling /usr/local/lib/python2.6/test/test_bisect.py ...
Compiling /usr/local/lib/python2.6/test/test_bool.py ...
Compiling /usr/local/lib/python2.6/test/test_bsddb.py ...
Compiling /usr/local/lib/python2.6/test/test_bsddb185.py ...
Compiling /usr/local/lib/python2.6/test/test_bsddb3.py ...
Compiling /usr/local/lib/python2.6/test/test_buffer.py ...
Compiling /usr/local/lib/python2.6/test/test_bufio.py ...
Compiling /usr/local/lib/python2.6/test/test_builtin.py ...
[1]   Segmentation fault (core dumped) PYTHONPATH=/usr/...
*** Error code 139

Stop.
make: stopped in /home/xuh/src/Python-2.6.6

Same thing with python 2.7.1.

--
components: Build
messages: 127802
nosy: H.Xu
priority: normal
severity: normal
status: open
title: python 2.6.6 and python 2.7.1 cannot be built successfully because of an 
segment fault on NetBSD-5.1-sparc
type: compile error
versions: Python 2.6, Python 2.7

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[issue7111] abort when stderr is closed

[Daniel Stutzbach]

Daniel Stutzbach stutzb...@google.com added the comment:

That's an interesting point.

Do you know of places where we use fd 2 instead of sys.stderr?

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[issue11107] Cache constant slice instances

[Stefan Behnel]

New submission from Stefan Behnel sco...@users.sourceforge.net:

Follow-up to ticket 10227. The following facts seem to indicate that it would 
be worth caching constant instances of the slice type, such as in [:] or [:-1].

with cached slice instance:

$ ./python -m timeit -s 'l = list(range(100)); s=slice(None)' 'l[s]'
100 loops, best of 3: 0.464 usec per loop
$ ./python -m timeit -s 'l = list(range(10)); s=slice(None)' 'l[s]'
1000 loops, best of 3: 0.149 usec per loop
$ ./python -m timeit -s 'l = list(range(10)); s=slice(None,1)' 'l[s]'
1000 loops, best of 3: 0.135 usec per loop

uncached normal usage:

$ ./python -m timeit -s 'l = list(range(100))' 'l[:]'
100 loops, best of 3: 0.499 usec per loop
$ ./python -m timeit -s 'l = list(range(100))' 'l[:1]'
1000 loops, best of 3: 0.171 usec per loop

Timings based on Python 3.2 rc2.

A quick grep against the py3k stdlib finds 2096 lines in 393 files that use 
constant slices.

--
components: Interpreter Core
messages: 127804
nosy: scoder
priority: normal
severity: normal
status: open
title: Cache constant slice instances
type: performance
versions: Python 3.3

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[issue10227] Improve performance of MemoryView slicing

[Stefan Behnel]

Stefan Behnel sco...@users.sourceforge.net added the comment:

Created follow-up issue 11107 for caching constant slice objects.

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[issue11107] Cache constant slice instances

[Stefan Behnel]

Stefan Behnel sco...@users.sourceforge.net added the comment:

Erm, issue 10227.

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[issue8914] Run clang's static analyzer

[Brett Cannon]

Brett Cannon br...@python.org added the comment:

This was just dead assignments. I have not tackled Idempotent operations, dead 
increments, dead initializations, dead nested assignments, possible deref of 
NULL, deref of unassigned pointer, division by zero, undefined/garbage results, 
or undefined alloc of 0 bytes.

IOW I tackled 36 out of 164 reported issues. =)

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[issue11107] Cache constant slice instances

[Alexander Belopolsky]

Alexander Belopolsky belopol...@users.sourceforge.net added the comment:

Similar idea has been rejected in issue2268 because the win was too small to 
justify the number of changes that had to be made.

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[issue7111] abort when stderr is closed

[Antoine Pitrou]

Antoine Pitrou pit...@free.fr added the comment:

 That's an interesting point.
 
 Do you know of places where we use fd 2 instead of sys.stderr?

We normally don't. One reason is that buffering inside sys.stderr can
make ordering of output incorrect. There are some places in C code where
we do fprintf(stderr, ...) but that's for specialized debugging
(disabled in normal builds) or fatal error messages.

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[issue11107] Cache constant slice instances

[Antoine Pitrou]

Changes by Antoine Pitrou pit...@free.fr:


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[issue11107] Cache constant slice instances

[Stefan Behnel]

Stefan Behnel sco...@users.sourceforge.net added the comment:

Hmm, ok, but AFAICT, your patch was rejected rather because of the way it 
approached the problem, not so much because of the issue itself.

Plus, the fact that Python 3 requires slices in more places than Python 2 
(which had the lower level getslice protocol) makes this a bigger issue now 
than it was three years ago.

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[issue7111] abort when stderr is closed

[Alexander Belopolsky]

Alexander Belopolsky belopol...@users.sourceforge.net added the comment:

On Thu, Feb 3, 2011 at 2:44 PM, Antoine Pitrou rep...@bugs.python.org wrote:
..
 Do you know of places where we use fd 2 instead of sys.stderr?

 We normally don't. One reason is that buffering inside sys.stderr can
 make ordering of output incorrect. There are some places in C code where
 we do fprintf(stderr, ...) but that's for specialized debugging
 (disabled in normal builds) or fatal error messages.

This is the case that I had in mind.  What does non-debug build do on
a fatal error?  Also, can we be sure that Python does not call C
library functions that write to stderr behind the scenes?  If vanilla
Python is safe to run with closed fd 2, that may not be the case for
3rd party extensions.What is the use case for python -?Is
it important enough to justify the risk of accidental data loss?

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[issue7111] abort when stderr is closed

[Alexander Belopolsky]

Alexander Belopolsky belopol...@users.sourceforge.net added the comment:

 On Thu, Feb 3, 2011 at 2:44 PM, Antoine Pitrou rep...@bugs.python.org wrote:
 ..
 Do you know of places where we use fd 2 instead of sys.stderr?

 We normally don't.

Hmm, grep fprintf(stderr, returned 122 hits in the py3k branch.
Are you sure these are all debug-build only?

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[issue7111] abort when stderr is closed

[Antoine Pitrou]

Changes by Antoine Pitrou pit...@free.fr:


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[issue7111] abort when stderr is closed

[Antoine Pitrou]

Antoine Pitrou pit...@free.fr added the comment:

  We normally don't. One reason is that buffering inside sys.stderr can
  make ordering of output incorrect. There are some places in C code where
  we do fprintf(stderr, ...) but that's for specialized debugging
  (disabled in normal builds) or fatal error messages.
 
 This is the case that I had in mind.  What does non-debug build do on
 a fatal error?

It uses fprintf(stderr, ...). That's the only thing it can do (there's
no way sys.stderr is guaranteed to be usable at that point). If C stderr
is invalid, then too bad.

 Also, can we be sure that Python does not call C
 library functions that write to stderr behind the scenes?

I think you can guess the answer :)

 What is the use case for python -?Is
 it important enough to justify the risk of accidental data loss?

I don't think so. One more important use case is when running a Unix
daemon, which has (AFAIK) to close all std handles. I don't know how
that interacts with using C stderr, especially if the handle closing is
done in Python (and therefore only calls C close() and not fclose()!).

Perhaps we should provide a sys function to fclose() C std{in,out,err}.

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[issue7111] abort when stderr is closed

[Antoine Pitrou]

Antoine Pitrou pit...@free.fr added the comment:

Le jeudi 03 février 2011 à 19:59 +, Alexander Belopolsky a écrit :
 Alexander Belopolsky belopol...@users.sourceforge.net added the comment:
 
  On Thu, Feb 3, 2011 at 2:44 PM, Antoine Pitrou rep...@bugs.python.org 
  wrote:
  ..
  Do you know of places where we use fd 2 instead of sys.stderr?
 
  We normally don't.
 
 Hmm, grep fprintf(stderr, returned 122 hits in the py3k branch.
 Are you sure these are all debug-build only?

grep -C2 seems to say most of them are. I haven't done a survey.

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[issue7111] abort when stderr is closed

[Daniel Stutzbach]

Daniel Stutzbach stutzb...@google.com added the comment:

On Thu, Feb 3, 2011 at 11:56 AM, Alexander Belopolsky
rep...@bugs.python.org wrote:
 3rd party extensions.    What is the use case for python -?    Is
 it important enough to justify the risk of accidental data loss?

I don't think closing stderr via the command line is an important use
case, but pythonw.exe and Unix daemon processes are important use
cases.

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[issue11105] Compiling evil ast crashes interpreter

[Georg Brandl]

Georg Brandl ge...@python.org added the comment:

Alex: If the node attributes were not mutable, it would be extremely awkward, 
not to say inefficient, to mutate an already existing AST as returned by 
ast.parse().

The AST objects in the _ast module aren't what Python works with internally, 
anyway. When calling ast.parse(), the AST is converted to Python objects (these 
are defined in Python-ast.c), and compile()ing such an object converts them 
back to the internal tree representation.  This conversion is where recursions 
would need to be handled.

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[issue7111] abort when stderr is closed

[Antoine Pitrou]

Antoine Pitrou pit...@free.fr added the comment:

 I don't think so. One more important use case is when running a Unix
 daemon, which has (AFAIK) to close all std handles.

I just took a look at http://pypi.python.org/pypi/python-daemon/, and it
uses dup2() to redirect standard streams, which is far nicer.

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[issue11107] Cache constant slice instances

[Antoine Pitrou]

Antoine Pitrou pit...@free.fr added the comment:

 Hmm, ok, but AFAICT, your patch was rejected rather because of the way
 it approached the problem, not so much because of the issue itself.

I would be rather for the patch myself. The bytecode currently generated
for sliced indexing is awfully suboptimal.

 Plus, the fact that Python 3 requires slices in more places than
 Python 2 (which had the lower level getslice protocol) makes this a
 bigger issue now than it was three years ago.

True.

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[issue8914] Run clang's static analyzer

[Raymond Hettinger]

Raymond Hettinger rhettin...@users.sourceforge.net added the comment:

Am looking forward to the rest.
This will be a nice cleanup.

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[issue8914] Run clang's static analyzer

[Brett Cannon]

Changes by Brett Cannon br...@python.org:


Removed file: http://bugs.python.org/file20660/clang_analyzer.diff

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[issue8914] Run clang's static analyzer

[Brett Cannon]

Brett Cannon br...@python.org added the comment:

New patch which covers dead assignments and increments.

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[issue7111] abort when stderr is closed

[Daniel Stutzbach]

Daniel Stutzbach stutzb...@google.com added the comment:

On Thu, Feb 3, 2011 at 12:18 PM, Antoine Pitrou rep...@bugs.python.org wrote:
 I just took a look at http://pypi.python.org/pypi/python-daemon/, and it
 uses dup2() to redirect standard streams, which is far nicer.

I'm more worried about the case where a daemon launches python.

At startup, could we check that 2 and 3 are valid file descriptors,
and, if not, open /dev/null?  That way, they cannot later be
inadvertently assigned to some other file?

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[issue11108] Intermittent AttributeError when using time.strptime in threads

[Carlos Corbacho]

New submission from Carlos Corbacho cathec...@gmail.com:

time.strptime() intermittently (and I mean _really_ intermittently) throws an 
AttributeError.

Steps to reproduce:

Run the attached script (you may have to do this quite a lot of times; in an 
evening of trying, I could only trigger this bug once...) - this just starts 
lots of threads so that we have lots of time.strptime()'s running in parallel.

Expected:

It just keeps running every time.

Actual:

On one run, the script bailed out almost immediately -

ccorbacho@valkyrie:~/chroots/trunk/home/ccorbacho/scratch/ccorbacho$ python 
test_time.py
Exception in thread Thread-2:
Traceback (most recent call last):
  File /usr/lib64/python2.6/threading.py, line 532, in __bootstrap_inner
self.run()
  File test_time.py, line 13, in run
time.strptime(30 Nov 00, %d %b %y)
AttributeError: _strptime_time

---
This is with Python 2.6.6. However, at work we have been seeing this very 
intermittently with Python 2.5 in threaded code doing time.strptime() as well 
(though we just get AttributeError: strptime, but I don't have any code I can 
provide to reproduce on 2.5), hence I'm raising the bug.

--
components: None
files: test_time.py
messages: 127822
nosy: ccorbacho
priority: normal
severity: normal
status: open
title: Intermittent AttributeError when using time.strptime in threads
type: crash
versions: Python 2.6
Added file: http://bugs.python.org/file20664/test_time.py

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[issue11106] python 2.6.6 and python 2.7.1 cannot be built successfully because of an segment fault on NetBSD-5.1-sparc

[Martin v . Löwis]

Martin v. Löwis mar...@v.loewis.de added the comment:

Can you debug this, e.g. by inspecting the core file?

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