hai shi <shihai1...@126.com> added the comment:

In PR19982, petr have mentioned that `PyType_GetModule` can not worked if the 
type is the subtype.

I try to use pep573 in functools, I get the error info from testcases:
======================================================================
ERROR: test_arg_combinations (test.test_functools.TestPartialCSubclass)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/temp/shihai/cpython/Lib/test/test_functools.py", line 109, in 
test_arg_combinations
    p = self.partial(capture)
TypeError: PyType_GetModule: Type 'CPartialSubclass' has no associated module

======================================================================
ERROR: test_attributes (test.test_functools.TestPartialCSubclass)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/temp/shihai/cpython/Lib/test/test_functools.py", line 71, in 
test_attributes
    p = self.partial(capture, 1, 2, a=10, b=20)
TypeError: PyType_GetModule: Type 'CPartialSubclass' has no associated module

----------

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<https://bugs.python.org/issue38787>
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