crazy-compilers: decompyle -- A Python byte-code reverter: "'decompyle' converts Python byte-code back into equivalent Python source. It accepts byte-code from any Python version starting with 1.5 up to 2.2.1
The generated source is very readable: docstrings, lists, tuples and hashes get pretty-printed. 'decompyle' may also verify the equivalence of the generated source by compiling it and comparing both byte-codes.
'decompyle' is based on John Aycock's generic small languages compiler 'spark' and his prior work on decompyle."