New submission from Anthony Sottile:
Originally from https://github.com/testing-cabal/mock/issues/350
## Example
```python
from unittest import mock
class C(object):
def f(self):
pass
c = C()
with mock.patch.object(c, 'f', autospec=True):
with mock.patch.object(c, 'f', autospec=True):
pass
```
## Python3.3
```
$ test.py
$
```
## Python3.4 / 3.5 / 3.6 (From gitbhub.com/python/cpython@fa3fc6d7)
```
Traceback (most recent call last):
File "test.py", line 10, in <module>
with mock.patch.object(c, 'f', autospec=True):
File "/home/asottile/workspace/cpython/Lib/unittest/mock.py", line 1320, in
__enter__
_name=self.attribute, **kwargs)
File "/home/asottile/workspace/cpython/Lib/unittest/mock.py", line 2220, in
create_autospec
_check_signature(original, new, skipfirst=skipfirst)
File "/home/asottile/workspace/cpython/Lib/unittest/mock.py", line 112, in
_check_signature
_copy_func_details(func, checksig)
File "/home/asottile/workspace/cpython/Lib/unittest/mock.py", line 117, in
_copy_func_details
funcopy.__name__ = func.__name__
File "/home/asottile/workspace/cpython/Lib/unittest/mock.py", line 578, in
__getattr__
raise AttributeError("Mock object has no attribute %r" % name)
AttributeError: Mock object has no attribute '__name__'
```
----------
components: Library (Lib)
messages: 262960
nosy: asottile
priority: normal
severity: normal
status: open
title: unittest.mock.patch: Double patching instance method: AttributeError:
Mock object has no attribute '__name__'
type: crash
versions: Python 3.4, Python 3.5, Python 3.6
_______________________________________
Python tracker <[email protected]>
<http://bugs.python.org/issue26704>
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