迭代定义
常见迭代对象
listtupledictsetstring
判断迭代对象
- 引入包
from collections import Iterable
- 执行判断
>>> from collections import Iterable
>>> isinstance('simple',Iterable)
True
>>> isinstance({'key'},Iterable)
True
>>> isinstance({'key':98},Iterable)
True
>>> isinstance((54,77),Iterable)
True
>>> isinstance([54,77],Iterable)
True
>>> isinstance(98,Iterable)
False
利用下标迭代
>>> for i,value in enumerate('string'):
... print(i,value)
...
0 s
1 t
2 r
3 i
4 n
5 g
双变量迭代
>>> for x,y in [(34,65),(45,45),(8,9),(21,3)]:
... print(x,y)
...
34 65
45 45
8 9
21 3
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