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Python String | isidentifier method
schedule Mar 5, 2023
Last updated local_offer
Tags Python
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Python's str.isidentifier() method returns a boolean indicating whether a string is a valid identifier.
NOTE
A valid identifier is defined as a string that only contains alphanumeric letters (a-z) and (0-9), or underscores (_), with the additional condition that the first character cannot be a number.
Parameters
No parameters.
Return value
A single boolean indicating whether or not the string is a valid identifier.
Examples
Valid identifier
To check whether 'SkyTowner_123' is a valid identifier:
x = 'SkyTowner_123'x.isidentifier()
True
Not a valid identifier
To check whether 'Sky Towner123' is a valid identifier:
y = 'Sky Towner123'y.isidentifier()
False
As 'Sky Towner123' contains a space character it is not a valid identifier.
To check whether '1SkyTowner123' is a valid identifier:
z = '1SkyTowner123'z.isidentifier()
False
As '1SkyTowner123' begins with a number it is not a valid identifier.
Published by Isshin Inada
Edited by 0 others
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Official Python Documentation
https://docs.python.org/3/library/stdtypes.html#str.isidentifier
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