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Python | in operator
schedule Aug 12, 2023
Last updated local_offer
Tags Python
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Python's in membership operator checks if a value exists in a sequence or not.
Syntax
x in y
Where:
x: the value we are checking for.
y: the sequence that we are checking for the value in.
Examples
String
To check whether 'art' exists in 'artist':
'art' in 'artist'
True
To check whether 'k' exists in 'table':
'k' in 'table'
False
List
To check whether 'orange' is in the list fruits:
fruits = ['apple', 'banana', 'pear', 'orange']'orange' in fruits
True
To check whether 'grape' is in the list fruits:
fruits = ['apple', 'banana', 'pear', 'orange']'grape' in fruits
False
Dictionary
For dictionaries, in tests whether the value exists as a key in the dictionary or not.
To check whether 'height' is a key in dictionary bob:
bob = {'age': 23, 'height': 180, 'hobby': 'surfing', 'fav_movie':'Forrest Gump'}
'height' in bob
True
To check whether 180 is a key in dictionary bob:
bob = {'age': 23, 'height': 180, 'hobby': 'surfing', 'fav_movie':'Forrest Gump'}
180 in bob
False
We obtain False as 180 is a value in the dictionary bob rather than a key.
Published by Arthur Yanagisawa
Edited by 0 others
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Official Python Documentation
https://docs.python.org/3.4/reference/expressions.html?highlight=membership operator#in
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