The current os.path.isabs documentation says:

> isabs(path) 
>    Return True if path is an absolute pathname (begins with a slash). 

The "begins with a slash" part is incorrect since certain systems use a
different pathname notation.
For example, on Macintosh (where os.sep == ":") this is an absolute
pathname:

hardDriveName:folderName1:folderName2:fileName.ext

...and this is a relative one:

:folderName1:fileName.ext


Moreover, on Windows os.path.isabs('\\') returns True since '\\' is an
alias for the current drive letter (e.g. C:\\) hence, independently from
what said before, the documentation should include also the "backslash"
term.
I think it would be better removing the "(begins with a slash)" part at all.

Fixed in r60314. Thanks for the report!

> Return ``True`` if *path* is an absolute pathname.  On Unix, that 
> means it begins with a slash, on Windows that it begins with a 
> backslash after chopping off a potential drive letter.

Actually the Windows part is not completely true since on Windows
pathnames containing slashes ('/') are also permitted and treated as if
they were backslashes ('\\').

>>> os.path.isabs('/')
True
>>> os.path.isabs('C:/')
True
>>> os.path.isabs('C:\\/')
True

Okay, fixed in r60317.