The attached 2.x-written protocol 0 pickle file cannot be loaded by Python 3.2 or 3.3, though it loads successfully in 2.x.

Code used to load:

data = pickle.load(open('test.bin', 'rb'))

Error:

Traceback (most recent call last):
  File "load_it.py", line 4, in <module>
    data = pickle.load(open(sys.argv[1], 'rb'))
ValueError: invalid literal for int() with base 10: "273\n(g8\nS'uint64_t'\np274\ntp275\nsS'Module'\np276\n(g45\n(g39\nS'objc_module'\np277\nNtp278\ntp279\nsS'mach_msg_trailer_size_t'\np280\n(g4\ng190\ntp281\nsS'uint_fast16_t'\np282\n(g8\nS'uint16_t'\np283\ntp284\nsS'pthread_m"

The failure occurs on Ubuntu Natty. This does not appear to be the same issue as #6137.

AFAIK the data contains no classes: just dictionaries, tuples, lists, strings and numbers.