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Tue Mar 6 22:43:19 CET 2007 · http://mail.python.org/pipermail/python-dev/2007-March/071629.html

Martin v. Löwis wrote:
> Ok - now I'm confused: do you consider this behavior 
> (splitext('.pythonrc') == ('', '.pythonrc')) correct
> or not?
>   

+1 on the behavior.  However, the patch is special-casing a leading dot; 
it would still fail on splitext("..").  If we're gonna fix the bug, I'd 
rather we fixed it dead.

What follows is a cross-platform splitext().  It passes all the tests I 
threw at it, also attached.  If there is interest, I would be happy to 
submit it as an alternate patch.  If runtime speed is paramount, I could 
lose the portability, and instead port my patch into all three *path.py 
files natively (dropping os.sep and os.altsep).

Hope this helps,

/larry/
----------
import os

def splitext(f):
  sepIndex = f.rfind(os.sep)
  if os.altsep:
    altsepIndex = f.rfind(os.altsep)
    sepIndex = max(sepIndex, altsepIndex)

  dotIndex = f.rfind(".")
  if dotIndex > sepIndex:
      # skip all leading dots
      filenameIndex = sepIndex + 1
      while filenameIndex < dotIndex:
        if f[filenameIndex] != '.':
          return f[:dotIndex], f[dotIndex:]
        filenameIndex += 1

  return f, ''

def splitextTest(path, filename, ext):
  assert splitext(path) == (filename, ext)
  assert splitext(os.sep + path) == (os.sep + filename, ext)
  assert splitext("abc" + os.sep + path) == ("abc" + os.sep + filename, ext)
  assert splitext("abc.def" + os.sep + path) == ("abc.def" + os.sep + 
filename, ext)
  if os.altsep:
    assert splitext(os.altsep + path) == (os.altsep + filename, ext)
    assert splitext("abc" + os.altsep + path) == ("abc" + os.altsep + 
filename, ext)
    assert splitext("abc.def" + os.altsep + path) == ("abc.def" + 
os.altsep + filename, ext)

splitextTest("foo.bar", "foo", ".bar")
splitextTest("foo.boo.bar", "foo.boo", ".bar")
splitextTest("foo.boo.biff.bar", "foo.boo.biff", ".bar")
splitextTest(".csh.rc", ".csh", ".rc")
splitextTest("nodots", "nodots", "")
splitextTest(".cshrc", ".cshrc", "")
splitextTest("...manydots", "...manydots", "")
splitextTest("...manydots.ext", "...manydots", ".ext")
splitextTest(".", ".", "")
splitextTest("..", "..", "")
splitextTest("........", "........", "")
//
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[Python-Dev] splitext('.cshrc')