Karthikeyan Singaravelan <tir.kar...@gmail.com> added the comment:

@berker.peksag I have created a unit test PR and verified that the test fails 
in 3.6 and passes on master.

# 3.6 branch

   cpython git:(25bd107399)   ./python.exe
Python 3.6.7+ (remotes/upstream/3.6:25bd107399, Nov  8 2018, 00:50:43)
[GCC 4.2.1 Compatible Apple LLVM 7.0.2 (clang-700.1.81)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> ^D
   cpython git:(25bd107399)   ./python.exe -m unittest -v 
unittest.test.testmock.testhelpers.SpecSignatureTest.test_autospec_getattr_partial_function
test_autospec_getattr_partial_function 
(unittest.test.testmock.testhelpers.SpecSignatureTest) ... ERROR

======================================================================
ERROR: test_autospec_getattr_partial_function 
(unittest.test.testmock.testhelpers.SpecSignatureTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File 
"/Users/karthikeyansingaravelan/stuff/python/cpython/Lib/unittest/test/testmock/testhelpers.py",
 line 884, in test_autospec_getattr_partial_function
    autospec = create_autospec(proxy)
  File 
"/Users/karthikeyansingaravelan/stuff/python/cpython/Lib/unittest/mock.py", 
line 2182, in create_autospec
    _check_signature(spec, mock, is_type, instance)
  File 
"/Users/karthikeyansingaravelan/stuff/python/cpython/Lib/unittest/mock.py", 
line 102, in _check_signature
    _copy_func_details(func, checksig)
  File 
"/Users/karthikeyansingaravelan/stuff/python/cpython/Lib/unittest/mock.py", 
line 107, in _copy_func_details
    funcopy.__name__ = func.__name__
AttributeError: 'functools.partial' object has no attribute '__name__'

----------------------------------------------------------------------
Ran 1 test in 0.007s

FAILED (errors=1)

# Master

   cpython git:(bpo32153) ./python.exe
Python 3.8.0a0 (heads/bpo32153:3e9cd8d982, Nov  8 2018, 00:53:46)
[Clang 7.0.2 (clang-700.1.81)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> ^D
   cpython git:(bpo32153) ./python.exe -m unittest -v 
unittest.test.testmock.testhelpers.SpecSignatureTest.test_autospec_getattr_partial_function
test_autospec_getattr_partial_function 
(unittest.test.testmock.testhelpers.SpecSignatureTest) ... ok

----------------------------------------------------------------------
Ran 1 test in 0.005s

OK

----------

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue32153>
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