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Python | not in operator
schedule Aug 10, 2023
Last updated local_offer
Tags Python
tocTable of Contents
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Python's not in membership operator checks if a value does not exist in a sequence or not.
Syntax
x not in y
Where:
x: the value we are checking for.
y: the sequence for which we are checking whether the value does not exist in or not.
Examples
String
To check whether 'pond' does not exist in 'poncho':
'pond' not in 'poncho'
True
As the string 'pond' does not indeed exist within 'poncho' we obtain True.
To check whether 'pond' does not exist in 'pondering':
'pond' not in 'pondering'
False
List
To check whether 'strawberry shortcake' does not exist in the list desserts:
desserts = ['apple crumble', 'banana cake', 'ice cream', 'tiramisu']'strawberry shortcake' not in desserts
True
To check whether 'tiramisu' does not exist in the list desserts:
desserts = ['apple crumble', 'banana cake', 'ice cream', 'tiramisu']'tiramisu' not in desserts
False
Dictionary
For dictionaries, not in tests whether the value does not exist as a key in the dictionary or not.
To check whether 'fav_song' is not a key in dictionary emma:
emma = {'age': 21, 'height': 165, 'hobby': 'drawing', 'fav_movie':'End Game'}
'fav_song' not in emma
True
To check whether 'hobby' is not a key in dictionary emma:
emma = {'age': 23, 'height': 165, 'hobby': 'surfing', 'fav_movie':'Forrest Gump'}
'hobby' not in emma
False
Published by Arthur Yanagisawa
Edited by 0 others
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