Python assert 语句
Python assert 语句语法：
assert expression [, argument]
栗子：
>>> assert True
>>> assert False # 会报错
Traceback (most recent call last):
File "<pyshell#9>", line 1, in <module>
assert False # 会报错
AssertionError
>>> a = 0
>>> assert a
Traceback (most recent call last):
File "<pyshell#11>", line 1, in <module>
assert a
AssertionError
>>> assert (5 == 5)
>>> a = 'q'
>>> assert (a in 'qiuyouzhi'), "错误！"
>>> a = 'f'
>>> assert (a in 'qiuyouzhi'), "错误！"
Traceback (most recent call last):
File "<pyshell#16>", line 1, in <module>
assert (a in 'qiuyouzhi'), "错误！"
AssertionError: 错误！ 栗子：
这是你帖子中出现的奇怪的标题
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