Alexandre Vassalotti added the comment:
pickle.py is the buggy one here. Its use of the marshal module is really a
hack. Plus, it is slower than both struct and int.from_bytes.
14:40:57 [~/cpython]$ ./python -m timeit "int.from_bytes(b'\xff\xff\xff\xff',
'big')"
1000000 loops, best of 3: 0.209 usec per loop
14:38:03 [~/cpython]$ ./python -m timeit -s "import struct"
"struct.unpack('>I', b'\xff\xff\xff\xff')"
10000000 loops, best of 3: 0.147 usec per loop
14:37:44 [~/cpython]$ ./python -m timeit -s "import marshal"
"marshal.loads(b'i'+b'\xff\xff\xff\xff')"
1000000 loops, best of 3: 0.236 usec per loop
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<http://bugs.python.org/issue12848>
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