near_me
Linear Algebra
keyboard_arrow_down 54 guides
chevron_leftCookbooks
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
Comment auto_stories Bi-column layout
settings
Checking if a given key already exists in a dictionary in Python
schedule Aug 10, 2023
Last updated local_offer
Tags Python
tocTable of Contents
expand_more Master the mathematics behind data science with 100+ top-tier guides
Start your free 7-days trial now!
Start your free 7-days trial now!
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
Comment
Citation
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!