Evil Python monkeypatching test

evil.py

import types

assert int(True) == 1 and int(False) == 0

# Who knew that __bulitins__ was a different object depending on whether you
# run a module directly or import it into another module?
if isinstance(__builtins__, types.ModuleType):
    __builtins__.True, __builtins__.False = False, True
else:
    __builtins__['True'], __builtins__['False'] = False, True

assert int(True) == 0 and int(False) == 1

main.py

assert int(True) == 1 and int(False) == 0
import evil
assert int(True) == 0 and int(False) == 1

print 'Importing evil successfully inverted True and False in main'
print 'int(True) => %d' % int(True)
print 'int(False) => %d' % int(False)