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Import error on Python 3.8 #16

@alandmoore

Description

@alandmoore

When importing pypxlib on Python 3.8 I get the following:

Traceback (most recent call last):
  File "/usr/lib/python3.8/ctypes/__init__.py", line 99, in CFUNCTYPE
    return _c_functype_cache[(restype, argtypes, flags)]
KeyError: (<class 'ctypes.c_void_p'>, (<class 'pypxlib.pxlib_ctypes.py3.LP_struct_px_doc'>, <class 'ctypes.c_int'>, <class 'pypxlib.pxlib_ctypes.py3.String'>, <class 'ctypes.c_void_p'>), 1)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/alanm/.local/lib/python3.8/site-packages/pypxlib/__init__.py", line 4, in <module>
    from pypxlib.pxlib_ctypes import *
  File "/home/alanm/.local/lib/python3.8/site-packages/pypxlib/pxlib_ctypes/__init__.py", line 15, in <module>
    from pypxlib.pxlib_ctypes.py3 import *
  File "/home/alanm/.local/lib/python3.8/site-packages/pypxlib/pxlib_ctypes/py3.py", line 951, in <module>
    ('errorhandler', CFUNCTYPE(UNCHECKED(None), POINTER(pxdoc_t), c_int, String, POINTER(None))),
  File "/usr/lib/python3.8/ctypes/__init__.py", line 101, in CFUNCTYPE
    class CFunctionType(_CFuncPtr):
TypeError: item 3 in _argtypes_ passes a union by value, which is unsupported.

This is on Arch Linux running Python 3.8.1. pypxlib from pypi.

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