如何在Python字典中打印给定值的键? [英] How can you print a key given a value in a dictionary for Python?

问题描述

例如，假设我们有以下字典:

For example lets say we have the following dictionary:

dictionary = {'A':4,
              'B':6,
              'C':-2,
              'D':-8}

如何给出给定值的特定键?

How can you print a certain key given its value?

print(dictionary.get('A')) #This will print 4

如何向后做呢?即不是通过引用键来获取值，而是通过引用值来获取键.

How can you do it backwards? i.e. instead of getting a value by referencing the key, getting a key by referencing the value.

推荐答案

我不认为有办法.这不是打算使用字典的方式... 相反，您必须执行与此类似的操作.

I don't believe there is a way to do it. It's not how a dictionary is intended to be used... Instead, you'll have to do something similar to this.

for key, value in dictionary.items():
    if 4 == value:
        print key

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