chevron_left
Cookbooks
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
check_circle
Mark as learned thumb_up
1
thumb_down
0
chat_bubble_outline
0
auto_stories new
settings
Checking if a given key already exists in a dictionary in Python
Operations
chevron_rightDictionary Operations
chevron_rightCookbooks
schedule Jul 1, 2022
Last updated local_offer Python
Tags tocTable of Contents
expand_more Check out the interactive map of data science
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
Did you find this page useful?
thumb_up
thumb_down
Ask a question or leave a feedback...
thumb_up
1
thumb_down
0
chat_bubble_outline
0
settings
Enjoy our search
Hit / to insta-search docs and recipes!