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Python | not in operator

Programming
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Python
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Operators
schedule Jul 1, 2022
Last updated
local_offer Python
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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
robocat
Published by Arthur Yanagisawa
Edited by 0 others
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