Python String isalnum()

Python string isalnum() method is a built-in function that returns True if all the characters in a string are alphanumeric. Otherwise, it returns false.

Example of characters that are not alphanumeric: (space)!#%&? etc.

What is Alphanumeric?

The alphanumeric is a string that consists of letters and numbers and often other symbols (such as punctuation marks and mathematical symbols).

isalnum() Syntax

The syntax of isalnum() method is:


isalnum() Parameters

The isalnum() method doesn’t take any parameters.

 isalnum() Return value

The isalnum() method returns:

  • True if all the characters in a string are either letters or numbers
  • False if one or more characters are not alphanumeric.

Example 1: Python string isalnum() working examples

# string is Alphanumeric 
text1 = "Python3"

# string is Alphanumeric
text2= "abc123def456"

# only alphabets and returns true
text3= "Itsmycode"

# only numbers and returns true

# Contains space returns false
text5= "Python Tutorials123"



Example 2: Program to check if the string is alphanumeric

# Alphanumeric string
text1 = "Python123Tutorials"
    print("String is Alphanumeric")
    print("String is not Alphanumeric")

# Non Alphanumeric String
text2= "hello World"
    print("String is Alphanumeric")
    print("String is not Alphanumeric")


String is Alphanumeric
String is not Alphanumeric
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