eryksun added the comment:
It works for me:
>>> open('test.c', 'w').write('long test(long x) {return x;}')
>>> os.system('gcc -shared -fPIC -o test.so test.c')
0
>>> test = CDLL('./test.so').test
>>> test.restype = c_long
>>> test.argtypes = (c_long,)
>>> test(2**63-1) == 2**63-1
True
However, I used the correct attribute name, "argtypes". ctypes objects have
dicts to allow setting arbitrary attribute names, so you won't get an
AttributeError when setting "args" on a function pointer.
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nosy: +eryksun
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