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distutils bdist_wininst failure on Linux
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Steven D'Aprano  
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 More options Feb 23, 9:06 am
Newsgroups: comp.lang.python
From: Steven D'Aprano <steve+comp.lang.pyt...@pearwood.info>
Date: 23 Feb 2012 14:06:22 GMT
Local: Thurs, Feb 23 2012 9:06 am
Subject: distutils bdist_wininst failure on Linux
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Following instructions here:

http://docs.python.org/py3k/distutils/builtdist.html#creating-windows...

I am trying to create a Windows installer for a pure-module distribution
using Python 3.2. I get a "LookupError: unknown encoding: mbcs"

Here is the full output of distutils and the traceback:

[steve@ando pyprimes]$ python3.2 setup.py bdist_wininst
running bdist_wininst
running build
running build_py
creating build/lib
copying src/pyprimes.py -> build/lib
installing to build/bdist.linux-i686/wininst
running install_lib
creating build/bdist.linux-i686/wininst
creating build/bdist.linux-i686/wininst/PURELIB
copying build/lib/pyprimes.py -> build/bdist.linux-i686/wininst/PURELIB
running install_egg_info
Writing build/bdist.linux-i686/wininst/PURELIB/pyprimes-0.1.1a-py3.2.egg-info
creating '/tmp/tmp3utw4_.zip' and adding '.' to it
adding 'PURELIB/pyprimes.py'
adding 'PURELIB/pyprimes-0.1.1a-py3.2.egg-info'
creating dist
Warning: Can't read registry to find the necessary compiler setting
Make sure that Python modules winreg, win32api or win32con are installed.
Traceback (most recent call last):
  File "setup.py", line 60, in <module>
    "License :: OSI Approved :: MIT License",
  File "/usr/local/lib/python3.2/distutils/core.py", line 148, in setup
    dist.run_commands()
  File "/usr/local/lib/python3.2/distutils/dist.py", line 917, in run_commands
    self.run_command(cmd)
  File "/usr/local/lib/python3.2/distutils/dist.py", line 936, in run_command
    cmd_obj.run()
  File "/usr/local/lib/python3.2/distutils/command/bdist_wininst.py", line 179, in run
    self.create_exe(arcname, fullname, self.bitmap)
  File "/usr/local/lib/python3.2/distutils/command/bdist_wininst.py", line 262, in create_exe
    cfgdata = cfgdata.encode("mbcs")
LookupError: unknown encoding: mbcs

How do I fix this, and is it a bug in distutils?

--
Steven


 
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jmfauth  
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 More options Feb 23, 10:09 am
Newsgroups: comp.lang.python
From: jmfauth <wxjmfa...@gmail.com>
Date: Thu, 23 Feb 2012 07:09:35 -0800 (PST)
Local: Thurs, Feb 23 2012 10:09 am
Subject: Re: distutils bdist_wininst failure on Linux
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On 23 fév, 15:06, Steven D'Aprano <steve

Because the 'mbcs' codec is missing in your Linux, :-)

>>> 'abc需'.encode('cp1252')
b'abc\xe9\x9c\x80'
>>> 'abc需'.encode('missing')

Traceback (most recent call last):
  File "<eta last command>", line 1, in <module>
LookupError: unknown encoding: missing

jmf


 
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Steven D'Aprano  
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 More options Feb 23, 7:11 pm
Newsgroups: comp.lang.python
From: Steven D'Aprano <steve+comp.lang.pyt...@pearwood.info>
Date: 24 Feb 2012 00:11:11 GMT
Local: Thurs, Feb 23 2012 7:11 pm
Subject: Re: distutils bdist_wininst failure on Linux
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On Thu, 23 Feb 2012 07:09:35 -0800, jmfauth wrote:
> On 23 fév, 15:06, Steven D'Aprano <steve
> +comp.lang.pyt...@pearwood.info> wrote:
>> Following instructions here:

>> http://docs.python.org/py3k/distutils/builtdist.html#creating-
windows...

>> I am trying to create a Windows installer for a pure-module
>> distribution using Python 3.2. I get a "LookupError: unknown encoding:
>> mbcs"
[...]
>> How do I fix this, and is it a bug in distutils?

> Because the 'mbcs' codec is missing in your Linux, :-)

Well duh :-)

This is a bug in distutils. Prompted by your comment I expanded my search
terms and found this bug report:

http://bugs.python.org/issue10945

The problem is that mbcs is not a real codec, it means "whatever codec is
currently configured in Windows". So it doesn't exist on non-Windows
platforms. But distutils bdist_wininst is explicitly documented as
working on non-Windows platforms. Hence, it's a bug.

--
Steven


 
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Steven D'Aprano  
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 More options Feb 23, 7:49 pm
Newsgroups: comp.lang.python
From: Steven D'Aprano <steve+comp.lang.pyt...@pearwood.info>
Date: 24 Feb 2012 00:49:11 GMT
Local: Thurs, Feb 23 2012 7:49 pm
Subject: Re: distutils bdist_wininst failure on Linux
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And I have a work-around that seems to work for me. Put this at the top
of your setup.py install script:

# Work around mbcs bug in distutils.
# http://bugs.python.org/issue10945
import codecs
try:
    codecs.lookup('mbcs')
except LookupError:
    ascii = codecs.lookup('ascii')
    func = lambda name, enc=ascii: {True: enc}.get(name=='mbcs')
    codecs.register(func)

--
Steven


 
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