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Python String | isidentifier method

Programming
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Python
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Operations
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String Operations
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Documentation
schedule Mar 10, 2022
Last updated
local_offer 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.

robocat
Published by Isshin Inada
Edited by 0 others
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