Isinstance и насмешка ⇐ Python

[Гость]

class HelloWorld(object):
def say_it(self):
return 'Hello I am Hello World'

def i_call_hello_world(hw_obj):
print 'here... check type: %s' %type(HelloWorld)
if isinstance(hw_obj, HelloWorld):
print hw_obj.say_it()

from mock import patch, MagicMock
import unittest

class TestInstance(unittest.TestCase):
@patch('__main__.HelloWorld', spec=HelloWorld)
def test_mock(self,MK):
print type(MK)
MK.say_it.return_value = 'I am fake'
v = i_call_hello_world(MK)
print v

if __name__ == '__main__':
c = HelloWorld()
i_call_hello_world(c)
print isinstance(c, HelloWorld)
unittest.main()


Вот обратная трассировка

here... check type:
Hello I am Hello World
True

here... check type:
E
======================================================================
ERROR: test_mock (__main__.TestInstance)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/usr/local/lib/python2.7/dist-packages/mock.py", line 1224, in patched
return func(*args, **keywargs)
File "t.py", line 18, in test_mock
v = i_call_hello_world(MK)
File "t.py", line 7, in i_call_hello_world
if isinstance(hw_obj, HelloWorld):
TypeError: isinstance() arg 2 must be a class, type, or tuple of classes and types

----------------------------------------------------------------------
Ran 1 test in 0.002s


Вопрос 1. Почему выдается эта ошибка? Это

Подробнее здесь: https://stackoverflow.com/questions/111 ... nd-mocking