Eryk Sun added the comment:

In older versions of ctypes, before it was added to the standard library, the 
underlying length field was a C int, and CArrayType_new used the PyInt_AS_LONG 
macro. ctypes was added to the standard library in 2.5, by which time the 
length field is Py_ssize_t, but CArrayType_new still used the PyInt_AS_LONG 
macro. That's still the case in 2.7. Python 3 changed this to call 
PyLong_AsLongAndOverflow, but apparently Christian Heimes didn't consider 
fixing this properly to use Py_ssize_t:

https://hg.python.org/cpython/rev/612d8dea7f6c

David, maybe there's a workaround for your use case, if you can provide some 
more details.

----------
nosy: +eryksun
versions: +Python 3.5, Python 3.6, Python 3.7 -Python 3.2, Python 3.3, Python 
3.4

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<http://bugs.python.org/issue16865>
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