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  1. import unittest.mock
  2.  
  3. class Foo:
  4. def __init__(self, aaa, bbb):
  5. self.aaa = aaa
  6. self.bbb = bbb
  7.  
  8. m = unittest.mock.Mock(spec=Foo)
  9. m.aaa
Runtime error #stdin #stdout #stderr 0.08s 12836KB
stdin
Standard input is empty
stdout
Standard output is empty
stderr
Traceback (most recent call last):
  File "./prog.py", line 9, in <module>
  File "/usr/lib/python3.5/unittest/mock.py", line 580, in __getattr__
    raise AttributeError("Mock object has no attribute %r" % name)
AttributeError: Mock object has no attribute 'aaa'