[Python] How would you implement ant-style patternsets in python to select groups of files?

Ant has a nice way to select groups of files, most handily using ** to indicate a directory tree. E.g.

**/CVS/* # All files immediately under a CVS directory.
mydir/mysubdir/** # All files recursively under mysubdir


More examples can be seen here:

http://ant.apache.org/manual/dirtasks.html

How would you implement this in python, so that you could do something like:

files = get_files("**/CVS/*")
for file in files:
print file

=>
CVS/Repository
mydir/mysubdir/CVS/Entries
mydir/mysubdir/foo/bar/CVS/Entries

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