Ned Deily added the comment:
The result of PATH= is also platform dependent. Testing on OS X which has a BSD
heritage rather a Linux one:
$ PATH= /usr/bin/which python
./python
# without patch
$ PATH= ./python -c 'import shutil; print(shutil.which("python"))'
python
$ ./python -c 'import shutil; print(shutil.which("python", path=""))'
/usr/bin/python
# with the patch:
$ PATH= ./python -c 'import shutil; print(shutil.which("python"))'
None
$ ./python -c 'import shutil; print(shutil.which("python", path=""))'
None
So, for OS X, shutil.which doesn't match /usr/bin/which behavior for the PATH=
case either with or without the patch. FreeBSD (8.2) /usr/bin/which is the
same. The other cases are the same as Linux.
I suppose the patched behavior is preferable, though.
In any case, the shutil.which docs also need to be updated.
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<http://bugs.python.org/issue17012>
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