Question

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Most efficient method to get key for a value in a dict
Python: Modify a dict to make the key a value, and a value the key

In python, suppose we have a dictionary:

mydict = {'myKey': 'myValue'}

To get the value for myKey we do

myDict['myKey']

Suppose we need to do things the other way around.
What is the easiest way to get the key for value my value?

Note: In this case my dictionary is static. The entries never change.

Answer 1

You could create a ‘reversed’ dictionary, since the initial dictionary is static:

>>> revdict = dict([(mydict[key],key) for key in mydict])
>>> revdict['myValue']
'myKey'