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To: python-list@python.org
From: Wolfgang Maier <wolfgang.maier@biologie.uni-freiburg.de>
Subject: Re: Success with subprocess communicate on Windows?
Date: Wed, 02 Jul 2014 19:37:03 +0200
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On 02.07.2014 19:31, Wolfgang Maier wrote:
>
> I am not 100% sure whether that is the problem, but from what I gather
> from the subprocess module docs the args string is passed to the Windows
> CreateProcess function as a single string.
> To me this seems to imply that it is passed as the lpCommandLine
> parameter (with Null for the lpApplicationName parameter).
> This is what Microsoft says about this case
> (http://msdn.microsoft.com/en-us/library/windows/desktop/ms682425%28v=vs.85%29.aspx):
>
>
> <quote>
> If lpApplicationName is NULL, the first white space–delimited token of
> the command line specifies the module name. If you are using a long file
> name that contains a space, use quoted strings to indicate where the
> file name ends and the arguments begin (see the explanation for the
> lpApplicationName parameter). If the file name does not contain an
> extension, .exe is appended. Therefore, if the file name extension is
> .com, this parameter must include the .com extension. If the file name
> ends in a period (.) with no extension, or if the file name contains a
> path, .exe is not appended. If the file name does not contain a
> directory path, the system searches for the executable file in the
> following sequence.
> </quote>
>
> So in your case the default behavior would be to add an .exe extension
> to pyflakes, which is probably not what you intended ?
>
> Best,
> Wolfgang
>

Ah, I forgot about your pyflakes -h example, which works, so my 
explanation must be wrong.
Sorry.