Python assert 语句

qiuyouzhi

Python assert 语句

语法：

1. assert expression [, argument]

复制代码

[size]栗子：

1. >>> assert True
   
2. >>> assert False # 会报错
   
3. Traceback (most recent call last):
   
4.   File "<pyshell#9>", line 1, in <module>
   
5.     assert False # 会报错
   
6. AssertionError
   
7. >>> a = 0
   
8. >>> assert a
   
9. Traceback (most recent call last):
   
10.   File "<pyshell#11>", line 1, in <module>
    
11.     assert a
    
12. AssertionError
    
13. >>> assert (5 == 5)
    
14. >>> a = 'q'
    
15. >>> assert (a in 'qiuyouzhi'), "错误！"
    
16. >>> a = 'f'
    
17. >>> assert (a in 'qiuyouzhi'), "错误！"
    
18. Traceback (most recent call last):
    
19.   File "<pyshell#16>", line 1, in <module>
    
20.     assert (a in 'qiuyouzhi'), "错误！"
    
21. AssertionError: 错误！

复制代码

wuqramy

[size]栗子：

这是你帖子中出现的奇怪的标题