test datetime monkey patch

a.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
__docformat__ = 'restructuredtext en'
from datetime import datetime
class Foo(object):

    def test(self):
        print repr(datetime)
# vim:set et sts=4 ts=4 tw=80:

b.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
__docformat__ = 'restructuredtext en'
import datetime
class Foo(object):

    def test(self):
        print repr(datetime.datetime)

# vim:set et sts=4 ts=4 tw=80:

main.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
__docformat__ = 'restructuredtext en'
import datetime
def monkey():
    class _datetime(datetime.datetime):
        def __repr__(self):
            return 'overiden'
    datetime.old_datetime = datetime.datetime
    datetime.datetime = _datetime
import a, b
# if the monkey patch happen after the loading of croniter, we are dead
# if we really on import cache (from datetime import datetime instead of
# datetime.datetime)
monkey()
a.Foo().test()
b.Foo().test()

# a.py
#from datetime import datetime
#class Foo(object):
#    def test(self):
#        print repr(datetime)

#b.py
#import datetime
#class Foo(object):
#    def test(self):
#        print repr(datetime.datetime) 


# execution should return:
"""
<type 'datetime.datetime'>
<class '__main__._datetime'>
"""