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Python | in operator

Programming
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Python
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Operators
schedule Jul 1, 2022
Last updated
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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.

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Published by Arthur Yanagisawa
Edited by 0 others
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