Nick Coghlan <ncogh...@gmail.com> added the comment:

This discussion (particularly my final globtree recipe) made me realise that 
the exact same approach would greatly improve the usability of the all_paths, 
file_paths and dir_paths iterators in walkdir [1]. Accordingly, walkdir 0.4 
will let you write a recursive grep for ReST and Python source files as:

    file_paths(top, included_files="*.py *.rst".split())

Scanning multiple directories will be as simple as:

    file_paths(dir1, dir2, included_files="*.py *.rst".split())

[1] https://bitbucket.org/ncoghlan/walkdir/issue/15

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<http://bugs.python.org/issue13968>
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