Python enumerate() 函数

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Python enumerate() 函数

语法

1. enumerate(iterable, start=0)

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参数

参数	描述
iterable	可迭代对象
start	索引序列的起始值，默认是 0

返回值

返回一个迭代器对象。

例子

1. >>> seasons = ['Spring', 'Summer', 'Autumn', 'Winter']
   
2. >>> enumerate(seasons)
   
3. <enumerate object at 0x000001E1A8531500>
   
4. >>> list(enumerate(seasons))
   
5. [(0, 'Spring'), (1, 'Summer'), (2, 'Autumn'), (3, 'Winter')]
   
6. >>> for i in enumerate(seasons):
   
7.         print(i)
   
8. 
   
9.        
   
10. (0, 'Spring')
    
11. (1, 'Summer')
    
12. (2, 'Autumn')
    
13. (3, 'Winter')

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---

1. >>> weeks = ['Monday','Tuesday','Wednesday','Thursday','Friday','Saturday','Sunday']
   
2. >>> for index, week in enumerate(weeks, 1):
   
3.         print(f"星期{index} : {week}")
   
4. 
   
5.        
   
6. 星期1 : Monday
   
7. 星期2 : Tuesday
   
8. 星期3 : Wednesday
   
9. 星期4 : Thursday
   
10. 星期5 : Friday
    
11. 星期6 : Saturday
    
12. 星期7 : Sunday
    
13. >>> list(enumerate(weeks, 1))
    
14. [(1, 'Monday'), (2, 'Tuesday'), (3, 'Wednesday'), (4, 'Thursday'), (5, 'Friday'), (6, 'Saturday'), (7, 'Sunday')]
    
15. >>> list(enumerate(weeks, 2))
    
16. [(2, 'Monday'), (3, 'Tuesday'), (4, 'Wednesday'), (5, 'Thursday'), (6, 'Friday'), (7, 'Saturday'), (8, 'Sunday')]
    
17. >>> list(enumerate(weeks, 3))
    
18. [(3, 'Monday'), (4, 'Tuesday'), (5, 'Wednesday'), (6, 'Thursday'), (7, 'Friday'), (8, 'Saturday'), (9, 'Sunday')]
    
19. >>> list(enumerate(weeks, 4))
    
20. [(4, 'Monday'), (5, 'Tuesday'), (6, 'Wednesday'), (7, 'Thursday'), (8, 'Friday'), (9, 'Saturday'), (10, 'Sunday')]

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永恒的蓝色梦想

1. def enumerate(iterable,start=0):
   
2.     for i in iterable:
   
3.         yield start,i
   
4.         start+=1

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