时间：2021-05-04 10:50:46 | 栏目：Python代码 | 点击：次
字符串遍历
>>> a_str = "hello itcast" >>> for char in a_str: ... print(char,end=' ') ... h e l l o i t c a s t
列表遍历
>>> a_list = [1, 2, 3, 4, 5] >>> for num in a_list: ... print(num,end=' ') ... 1 2 3 4 5
元组遍历
>>> a_turple = (1, 2, 3, 4, 5) >>> for num in a_turple: ... print(num,end=" ") 1 2 3 4 5
字典遍历
遍历字典的key（键）
>>> a_dict = {"name":"lxy","sex":"男","age":18}
>>> for key in a_dict.keys():
print(key)
name
sex
age
遍历字典的value（值）
>>> a_dict = {"name":"lxy","sex":"男","age":18}
>>> for value in a_dict.values():
print(value)
lxy
男
18
>>>
遍历字典的项（元素）
>>> 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
重点：带下标索引的遍历
正常情况我们是这样的
>>> 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
升级版使用enumerate()
>>> chars = ['a', 'b', 'c', 'd'] >>> for i, chr in enumerate(chars): print(i,chr) 0 a 1 b 2 c 3 d >>>