Python assert 用法

Python中assert用来判断语句的真假，如果为假的话将触发AssertionError错误

python help document的解释：

Assert statements are a convenient way to insert debugging assertions into a program:

例：

>>> a = 3

>>> assert a ==3

>>> a = 2

>>> assert a ==3

Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

AssertionError

例2：