Finding matching keys in two large dictionaries and doing it fast

Question

I am trying to find corresponding keys in two different dictionaries. Each has about 600k entries.

Say for example:

    myRDP = { \'Actinobacter\':          


        

Answer 1

You can simply write this code and it will save the common key in a list. common = [i for i in myRDP.keys() if i in myNames.keys()]