Title: Compare Two Dictionaries
Slug: compare_two_dictionaries
Summary: Compare Two Dictionaries Using Python.
Date: 2017-02-02 12:00
Category: Python
Tags: Basics
Authors: Chris Albon

One of the great features of Python dictionaries is that they are hashtables, meaning we can do some operations at O(1) time-complexity.

Make Two Dictionaries



In [1]:

    
importers = {'El Salvador' : 1234,
             'Nicaragua' : 152,
             'Spain' : 252
            }

exporters = {'Spain' : 252,
             'Germany' : 251,
             'Italy' : 1563
             }

Find Duplicate Keys



In [2]:

    
# Find the intersection of importers and exporters
importers.keys() & exporters.keys()









    Out[2]:





{'Spain'}

Find Difference In Keys



In [3]:

    
# Find the difference between importers and exporters
importers.keys() - exporters.keys()









    Out[3]:





{'El Salvador', 'Nicaragua'}

Find Key, Values Pairs In Common



In [4]:

    
# Find countries where the amount of exports matches the amount of imports
importers.items() & exporters.items()









    Out[4]:





{('Spain', 252)}