[Python] How to check if a value exists in a dictionary?

I have the following dictionary in python:

d = {'1': 'one', '3': 'three', '2': 'two', '5': 'five', '4': 'four'}


I need a way to find if a value such as "one" or "two" exists in this dictionary.

For example, if I wanted to know if the index "1" existed I would simply have to type:

"1" in d


And then python would tell me if that is true or false, however I need to do that same exact thing except to find if a value exists.

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