Pythonが嫌いになるかも知れない1行ハック

>>> __builtins__ = 0 # <- コレ
>>>
>>> int('123')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'int' is not defined
>>> for i in range(10):
...     print i
... 
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'range' is not defined
>>>