Python del 语句

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Python del 语句

语法：

1. del sth

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可以删除掉一个变量，一个列表，一个列表中的键。。。等等等等。

实例：

1. >>> a = 5
   
2. >>> a
   
3. 5
   
4. >>> del a
   
5. >>> a
   
6. Traceback (most recent call last):
   
7.   File "<pyshell#17>", line 1, in <module>
   
8.     a
   
9. NameError: name 'a' is not defined
   
10. >>> a = [1,2,3,4,5]
    
11. >>> del a[4]
    
12. >>> a
    
13. [1, 2, 3, 4]
    
14. >>> del a[0]
    
15. >>> a
    
16. [2, 3, 4]
    
17. >>> del a
    
18. >>> a
    
19. Traceback (most recent call last):
    
20.   File "<pyshell#24>", line 1, in <module>
    
21.     a
    
22. NameError: name 'a' is not defined
    
23. >>> a = {0: '0', 1: '1'}
    
24. >>> del a[0]
    
25. >>> a
    
26. {1: '1'}
    
27. >>> del a
    
28. >>> a
    
29. Traceback (most recent call last):
    
30.   File "<pyshell#29>", line 1, in <module>
    
31.     a
    
32. NameError: name 'a' is not defined
    
33. >>> def func():
    
34.         print("FUNC!")
    
35. 
    
36.        
    
37. >>> func()
    
38. FUNC!
    
39. >>> del func
    
40. >>> func()
    
41. Traceback (most recent call last):
    
42.   File "<pyshell#35>", line 1, in <module>
    
43.     func()
    
44. NameError: name 'func' is not defined

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