[Python-Dev] unifying os.rename semantics across platform
skip@pobox.com (Skip Montanaro)
skip@pobox.com (Skip Montanaro)
Tue, 22 May 2001 16:54:42 -0500
Couldn't figure out why this message never generated any comment. Turns out
it didn't reach the list because the host I sent it from
(dynamic4.tttech.com) couldn't be resolved. I just noticed it in my errors
mailbox and am sending it out again.
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It was brought to my attention a week ago by a client that os.rename
semantics differ between Unix and Windows. On Unix, if the destination file
already exists it is silently deleted. On Windows, an exception is raised.
I was able to verify this for Python 2.0 on Windows98. I assume nothing
changed for 2.1, but I can't verify that. (Windows trashed my partition
table and my Linux root partition while I was downloading 2.1.
Consequently, I no longer run Windows. Take that, Bill...) I haven't
checked the Mac yet (will do that when I get back to the US), but I think
that os.rename should have the same semantics across all platforms. To the
extent reasonably possible, I think this should also be true of other common
functions exposed through the os module.
On the (unsupportable) theory that to-date, more Python apps have been
written and/or deployed on Unix-like systems and that where Windows apps are
concerned, many developers will have added a thin wrapper to mimic the Unix
semantics, I think less breakage would result if the Unix semantics were
implemented in the Windows version. It appears that is what POSIX
compliance would demand as well.
Skip