s...@pobox.com wrote:
> The doc for os.path.commonprefix states:
>
> Return the longest path prefix (taken character-by-character) that is a
> prefix of all paths in list. If list is empty, return the empty string
> (''). Note that this may return invalid paths because it works a
> character at a time.
>
> I remember encountering this in an earlier version of Python 2.x (maybe 2.2
> or 2.3?) and "fixed" it to work by pathname components instead of by
> characters. That had to be reverted because it was a behavior change and
> broke code which used it for strings which didn't represent paths. After
> the reversion I then forgot about it.
>
> I just stumbled upon it again. It seems to me this would have been a good
> thing to fix in 3.0. Is this something which could change in 3.1 (or be
> deprecated in 3.1 with deletion in 3.2)?
Why can't we add an "allow_fragment" keyword that defaults to True? Then
"allow_fragment=False" will stop at the last full directory name and
ignore any partial matches on the filenames or the next subdirectory
(depending on where the common prefix ends).
Cheers,
Nick.
--
Nick Coghlan | ncogh...@gmail.com | Brisbane, Australia
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