Python字典获得多个值 [英] Python dictionary get multiple values

问题描述

对不起，如果这个问题已经存在，但是我已经搜索了一段时间了。

Sry if this question already exists, but I've been searching for quite some time now.

我在python中有一个字典，我想做什么是从列表中获取一些值，但我不知道实现是否支持此操作。

I have a dictionary in python, and what I want to do is get some values from it as a list, but I don't know if this is supported by the implementation.

myDictionary.get('firstKey')   # works fine

myDictionary.get('firstKey','secondKey')
# gives me a KeyError -> OK, get is not defined for multiple keys
myDictionary['firstKey','secondKey']   # doesn't work either

但是有什么办法可以实现？在我的示例中，这看起来很简单，但是假设我有20个条目的字典，并且想要获得5个键。除了做

But is there any way I can achieve this? In my example it looks easy, but let's say I have a dictionary of 20 entries, and I want to get 5 keys. Is there any other way than doing

myDictionary.get('firstKey')
myDictionary.get('secondKey')
myDictionary.get('thirdKey')
myDictionary.get('fourthKey')
myDictionary.get('fifthKey')

推荐答案

使用进行循环：

keys = ['firstKey', 'secondKey', 'thirdKey']
for key in keys:
    myDictionary.get(key)

或列表理解：

[myDictionary.get(key) for key in keys]

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