Custom sort of a files list

gistfile1.py

def _cmp(a, b):
    if a[0].rfind(b[0]) == 0:
        return -1
    elif a[0].rfind(b[0]) == -1:
        if a[0] < b[0] :
            return -1
        return 1
    else:
        return 0

# Reorder the remote_tree so files that belongs to a folder are before
# the parent folder. It helps when deleting a folder that contains files
# as files are deleted before the folder so the deletion of the folder
# occurs when the folder is empty.
# before: ['bar', 'bar/baz', 'foo', 'foo/bar']
# after: ['bar/baz', 'bar', 'foo/bar', 'foo']
remote_tree = OrderedDict(sorted(remote_tree.items(), cmp=_cmp))