Eric V. Smith added the comment:
I think the 2.7 documentation is correct: the current directory when the call
is made, and not cwd, is included in the search path. I'd suggest specifying
args as ["c:\\python33\\workspace\\plink.exe"].
I think I may have mislead you earlier on the search path. The Windows call is:
CreateProcess(lpApplicationName, lpCommandLine, <other stuff>,
lpCurrentDirectory, <other stuff>)
The first parameter to Popen ("args") becomes lpCommandLine. The "executable"
parameter to Popen, which you're not setting, becomes lpApplicationName. So,
you're calling CreateProcess(NULL, "plink.exe, ...,
lpCurrentDirectory="c:\\python33\\workspace").
In this case, .exe would be added if missing. But, the search path rules seem
to not include the directory pointed to by lpCurrentDirectory (aka cwd).
So I think this would work:
subprocess.Popen(["c:\\python33\\workspace\\plink.exe"],
stdout=subprocess.PIPE, cwd="c:\\python33\\workspace")
or
subprocess.Popen(["plink"], executable="c:\\python33\\workspace\\plink.exe",
stdout=subprocess.PIPE, cwd="c:\\python33\\workspace")
Unfortunately, I don't have a copy of 3.x on my Windows machine to test with.
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<http://bugs.python.org/issue20927>
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