Python String isalnum() Method

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:

isalnum()  

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.

 # Python isalnum() function example  

# Variable declaration  

str = "Welcome"  

# Calling function  

str2 = str.isalnum()  

# Displaying result  

print(str2)

Output:

True

Example 2

If there is a space anywhere in the string, it returns False. See the example below.

# Python isalnum() function example  

# Variable declaration  

str = "Welcome"  

# Calling function  

str2 = str.isalnum()  

# Displaying result  

print(str2)

Output:

False

Example 3

Let us take an example to demonstrate the Python string isalnum() function in Java.

# Python isalnum() function example  

# Variable declaration  

str = "Welcome123" # True  

str3 = "Welcome 123" # False  

# Calling function  

str2 = str.isalnum()  

str4 = str3.isalnum()  

# Displaying result  

print(str2)  

print(str4)

Output:

True
False

Example 4

It returns True even the string is full of digits. See the example.

# Python isalnum() function example  

# Variable declaration  

str = "123456"  

# Calling function  

str2 = str.isalnum()  

# Displaying result  

print(str2)

Output:

True

Note: This method returns True if any one of these isalpha(), isdecimal(), isdigit(), or isnumeric() returns True.