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Python - Intersect two dictionaries through keys
In this article, we are going to learn how to intersect two dictionaries using keys. We have to create a new dictionary with common keys. Let's see an example.
Input:
dict_1 = {'A': 1, 'B': 2, 'C': 3}
dict_2 = {'A': 1, 'C': 4, 'D': 5}
Output:
{'A': 1, 'C': 3}We are going to use the dictionary comprehension to solve the problem. Follow the below steps to write the code.
- Initialize dictionaries.
- Iterate over the dictionary one and add elements that are not in dictionary two.
- Print the result.
Example
# initializing the dictionaries
dict_1 = {'A': 1, 'B': 2, 'C': 3}
dict_2 = {'A': 1, 'C': 4, 'D': 5}
# finding the common keys
result = {key: dict_1[key] for key in dict_1 if key in dict_2}
# printing the result
print(result)If you run the above code, then you will get the following result.
Output
{'A': 1, 'C': 3}
We can also solve the problem using bitwise & operator. It simply filters the common keys and corresponding value from the dictionaries. Only filters keys with the same value.
Example
# initializing the dictionaries
dict_1 = {'A': 1, 'B': 2, 'C': 3}
dict_2 = {'A': 1, 'C': 4, 'D': 5}
# finding the common keys
result = dict(dict_1.items() & dict_2.items())
# printing the result
print(result)If you run the above code, then you will get the following result.
Output
{'A': 1}
Conclusion
You can choose any method you want based on your preference and use case. If you have any queries, mention them in the comment section.
Updated on: 13-Nov-2020
1K+ Views
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