isalnum()
Python String isalnum() Method
Last Updated : 30 Dec 2025
Python isalnum() method checks whether the all characters of the string is alphanumeric or not. A character which is either a letter or a number is known as alphanumeric. It does not allow special chars even spaces.
Syntax of String isalnum() Method
It has the following syntax:
Parameters
No parameter is required.
Return
It returns either True or False.
Different Examples for Python String isalnum() Method
Let's see some examples of isalnum() method to understand it's functionalities.
Example 1
Let us take an example to demonstrate the Python string isalnum() function in Java.
Output:
Example 2
If there is a space anywhere in the string, it returns False. See the example below.
Output:
Example 3
Let us take an example to demonstrate the Python string isalnum() function in Java.
Output:
Example 4
It returns True even the string is full of digits. See the example.
Output: