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本文将通过for ... in ...的语法结构,遍历字符串、列表、元组、字典等数据结构。
>>> a_str = "hello itcast" >>> for char in a_str: ... print(char,end=' ') ... h e l l o i t c a s t
>>> a_list = [1, 2, 3, 4, 5] >>> for num in a_list: ... print(num,end=' ') ... 1 2 3 4 5
>>> a_turple = (1, 2, 3, 4, 5) >>> for num in a_turple: ... print(num,end=" ") 1 2 3 4 5
>>> a_dict = {"name":"lxy","sex":"男","age":18} >>> for key in a_dict.keys(): print(key) name sex age
>>> a_dict = {"name":"lxy","sex":"男","age":18} >>> for value in a_dict.values(): print(value) lxy 男 18 >>>
>>> a_dict = {"name":"lxy","sex":"男","age":18} >>> for key,value in a_dict.items(): print("key=%s,value=%s"%(key,value)) key=name,value=lxy key=sex,value=男 key=age,value=18
>>> chars = ['a', 'b', 'c', 'd'] >>> i = 0 >>> for chr in chars: ... print("%d %s"%(i, chr)) ... i += 1 ... 0 a 1 b 2 c 3 d
>>> chars = ['a', 'b', 'c', 'd'] >>> for i, chr in enumerate(chars): print(i,chr) 0 a 1 b 2 c 3 d >>>
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