As I mentioned on python-ideas, I my project needs to extend fnmatch to 
support zsh-style globbing, where you can use brackets to designate 
subexpressions. Say you had a directory structure like this:

foo/
 foo.ext1
 foo.ext2
bar/
 foo.ext1
 foo.ext2

The subexpressions will let you do patterns like this:

>>> glob.glob('foo/foo.{ext1,ext2}')
['foo/foo.ext1', 'foo/foo.ext2']
>>> glob.glob('foo/foo.ext{1,2}')
['foo/foo.ext1', 'foo/foo.ext2']
>>> glob.glob('{foo,bar}')
['bar', 'foo']
>>> glob.glob('{foo,bar}/foo*')
['bar/foo.ext1', 'bar/foo.ext2', 'foo/foo.ext1', 'foo/foo.ext2']
>>> glob.glob('{foo,bar}/foo.{ext*}')
['bar/foo.ext1', 'bar/foo.ext2', 'foo/foo.ext1', 'foo/foo.ext2']
>>> glob.glob('{f?o,b?r}/foo.{ext*}')
['bar/foo.ext1', 'bar/foo.ext2', 'foo/foo.ext1', 'foo/foo.ext2']


Would this be interesting to anyone else? It would unfortunately break 
fnmatch since it currently treats {} as ordinary characters. It'd be 
easy to work around that by adding a flag or using a different function 
name though. Anyway, here's the patch against the head of py3k.

This should be applicable to 2.7, at least, as well. Here is a backport 
of the patch against trunk.

This can't go in like this, since suddenly accepting braces is a subtle
change of semantics.  I could imagine adding another function though,
that has extended zsh-like globbing abilities.

I completely agree, Georg. I tried to get this in before 3.0, but it
didn't work out which is a shame. I assume you also feel that we
couldn't make a backwards compatible change in 3.1, right? I thought I
heard that 3.1 may break some things in 3.0, but I'm not positive.

Got any suggestions for a function name? Here are some I have in mind,
but none of them are particularly good:

fnmatch.fnmatch2
fnmatch.efnmatch
fnmatch.extended_fnmatch

glob.glob2
glob.eglob
glob.extended_glob

I like glob_ext() and fnmatch_ext().

Is there mileage for glob.glob to grow a dialect
param, with a default value to keep it backwards
compatible? Otherwise, presumably, proponents of
some other xsh variant will come forward with
their scheme of matching, and regex-followers
with theirs and so on.