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Adding new key-value pairs to a dictionaryChanging values in a dictionaryChecking if a dictionary is emptyChecking if a given key already exists in a dictionaryLooping through key-value pairs in a dictionaryLooping through keys in a dictionaryLooping through values in a dictionaryMerging two dictionariesRemoving key-value pairs from a dictionaryRetrieving values in a dictionarySorting a dictionary by value
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Merging two dictionaries in Python
schedule Aug 12, 2023
Last updated local_offer
Tags Python
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There are 2 main ways to merge two dictionaries: using a shallow merge or using the dict.update(~) method.
Shallow merge
To create dictionary z from a shallow merge of dictionaries x and y:
x = {'a': 1, 'b': 2}y = {'b': 3, 'c': 4}z = {**x,**y}print(z)
{'a': 1, 'b': 3, 'c': 4}
Note that using this method dictionaries x and y themselves are not modified.
dict.update method
To update dictionary x with elements from dictionary y:
x = {'a': 1, 'b': 2}y = {'b': 3, 'c': 4}x.update(y)print(x)
{'a': 1, 'b': 3, 'c': 4}
Note that dictionary x itself is updated here with key/value pairs from y. As key 'b' already exists in dictionary x, the corresponding value is simply updated from dictionary y.
To keep dictionary x intact, we should generate a copy of it to use for merging:
x = {'a': 1, 'b': 2}y = {'b': 3, 'c': 4}z = x.copy()z.update(y)print(z)
{'a': 1, 'b': 3, 'c': 4}
Published by Isshin Inada
Edited by 0 others
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