如何在python中使用enumerate()枚举字典中的项目 [英] How to enumerate items in a dictionary with enumerate( ) in python

问题描述

正如标题所示，我想在python中枚举键及其值(不带方括号).我尝试了以下代码:

As the title suggests I wanted to enumerate the key and its values (without brackets) in python. I tried the following code :

example_dict = {'left':'<','right':'>','up':'^','down':'v',}
[print(i,j,a) for (i,j,a) in enumerate(example_dict.items())]

但是它不起作用.我希望输出像这样

But it doesn't work. I want the output to be like this

0 left <
1 right >
2 up ^
3 down v

提前谢谢

推荐答案

在这种情况下，枚举返回(index，(key，value))，因此您只需要将拆包更改为对于i，(j，a)，尽管我个人会使用 k，v 代替示例中的 j，a .

In this case enumerate returns (index, (key, value)), so you just need to change your unpacking to for i, (j, a), though personally I would use k, v instead of j, a in an example.

for i, (k, v) in enumerate(example_dict.items()):
    print(i, k, v)

顺便说一句，不要对任何副作用都理解；只需使用for循环即可.

BTW, don't use a comprehension for side effects; just use a for-loop.

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