It is very straight forward; split on "_", create a new list of lists that 
contains a sublist of [file ending as an integer, file name], and sort

    fnames=["XXX_chunk_0",
            "XXX_chunk_10",
            "XXX_chunk_1",
            "XXX_chunk_20",
            "XXX_chunk_2"]
    sorted_list=[[int(name.split("_")[-1]), name] for name in fnames]
    print "before sorting", sorted_list
    sorted_list.sort()
    print "after sorting ", sorted_list
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