Python List、Tuple、Set、Dict 遍历

1 l = [1, 2, 3, 4, 5, 6]
2 
3 for i in l:
4     print(i)
5 
6 for i in range(len(l)):
7     print(i, l[i])

1 tup = (1, 2, 3, 1, 2, 3)
2 
3 for i in tup:
4     print(i)
5 
6 for i in range(len(tup)):
7     print(i, tup[i])

1 s = {4, 2, 3, 1, 5}
2 for i in s:
3     print(i)

 1 data = {"username": "HelloWorld", "age": 22, "role": "student"}
 2 
 3 # 直接遍历字典获取值，根据键取值
 4 for key in data:
 5     print(key, data[key])
 6 
 7 # 利用items方法获取键值，速度很慢，尽量不用
 8 for key, value in data.items():
 9     print(key, value)
10 
11 # 利用keys获取键，根据键取值
12 for key in data.keys():
13     print(key, data[key])
14 
15 # 利用values获取值，但是无法获取对应的键
16 for value in data.values():
17     print(value)