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@author jackzhenguo
@desc 
@date 2019/3/4

47 枚举对象　　

返回一个可以枚举的对象，该对象的next()方法将返回一个元组。

In [1]: s = ["a","b","c"]
    ...: for i ,v in enumerate(s,1):
    ...:     print(i,v)
    ...:
1 a
2 b
3 c