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Python standard library: dis

dis is a disassembler for bytecode. 
>>> def F(a, b):
...    print(a * b)
...
>>> import dis
>>> dis.dis(F)
  2           0 LOAD_GLOBAL              0 (print)
              2 LOAD_FAST                0 (a)
              4 LOAD_FAST                1 (b)
              6 BINARY_MULTIPLY
              8 CALL_FUNCTION            1
             10 POP_TOP
             12 LOAD_CONST               0 (None)
             14 RETURN_VALUE

COMPILER_FLAG_NAMES

COMPILER_FLAG_NAMES is a dict whose keys seem to be the flags that can be assigned to co_flags of a code object (i. e. the __code__ attribute of a function). 
>>> for k,v in dis.COMPILER_FLAG_NAMES.items():
...    print(k, v)
...
1 OPTIMIZED
2 NEWLOCALS
4 VARARGS
8 VARKEYWORDS
16 NESTED
32 GENERATOR
64 NOFREE
128 COROUTINE
256 ITERABLE_COROUTINE
512 ASYNC_GENERATOR

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