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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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Checking if a given key already exists in a dictionary in Python
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schedule Jul 1, 2022
Last updated local_offer Python
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We can check if a key already exists in a dictionary by using the operator in.
Example
To check if key2 already exists as a key in dictionary d:
The above if-else block is based on the fact that comparison using the in operator returns a boolean:
d = {'key1': 1, 'key2': 2, 'key3': 3}
'key2' in d
True
Published by Isshin Inada
Edited by 0 others
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