Python patch object with a side_effect

Use patch.object as a decorator or context manager, as in the following code:

>>> class EmailChecker():
...     def is_email_correct(self, email):
...         pass
... 
>>> def my_side_effect(*args):
...     if args[0] == '1':
...         return True
...     else:
...         return False
... 
>>> with mock.patch.object(EmailChecker, 'is_email_correct', side_effect=my_side_effect):
...     checker = EmailChecker()
...     print(checker.is_email_correct('1'))
...     print(checker.is_email_correct('2'))
... 
True
False

NOTE: Replaced **args with *args. Added missing self argument to is_email_correct method.

my_side_effect could be simplified as follows:

def my_side_effect(email): 
    return email == '1'