柚子快报邀请码778899分享：Python遍历字典

柚子快报邀请码778899分享：Python遍历字典

http://yzkb.51969.com/

1.遍历key值

1 >>> d = {'Python':'astonishing', 'C++':'complicated', 'Java':'versatile'}

2 >>> for key in d:

3 ... print(key + ':' + d[key])

4 ...

5 Python:astonishing

6 C++:complicated

7 Java:versatile

同理，可把下列代码的d改为d.keys()

notice:python2除了上述两种方法外，还可以写为d.iterkeys()

2.遍历value值

1 >>> for value in d:

2 ... print(value)

3 ...

4 Python

5 C++

6 Java

同理，可把下列代码的d改为d.values()

notice:python2除了上述两种方法外，还可以写为d.itervalues()

3.遍历字典

1 >>> for kv in d.items():

2 ... print(kv)

3 ...

4 ('Python', 'astonishing')

5 ('C++', 'complicated')

6 ('Java', 'versatile')

7 >>> for k, v in d.items():#开始偷懒，缩写k, v

8 ... print(k + ':' + v)

9 ...

10 Python:astonishing

11 C++:complicated

12 Java:versatile

其实还有一种方法，用到了zip(元素对)使得我们可以像c/c++等语言一样循环两个变量

1 >>> for k, v in zip(d.keys(), d.values()):

2 ... print(k + ':' + v)

3 ...

4 Python:astonishing

5 C++:complicated

6 Java:versatile

 关于zip的用法，详见python cookbook:https://python3-cookbook.readthedocs.io/zh_CN/latest/c04/p11_iterate_over_multiple_sequences_simultaneously.html

柚子快报邀请码778899分享：Python遍历字典

http://yzkb.51969.com/

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