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Python String | isalnum() method with Examples

Python String isalnum() method with Examples on capitalize(), center(), count(), encode(), find(), format(), index(), join(), lower(), ljust(), isupper(), istitle(), isspace(), isprintable(), isnumeric(), islower() etc.

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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.

Signature

isalnum()

Parameters

No parameter is required.

Return

It returns either True or False.

Let's see some examples of isalnum() method to understand it's functionalities.

Python String isalnum() Method Example 1

# Python isalnum() function example
# Variable declaration
str = "Welcome"
# Calling function
str2 = str.isalnum()
# Displaying result
print(str2)

Output:

True

Python String isalnum() Method 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

Python String isalnum() Method Example 3

# 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

Python String isalnum() Method 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.


Next TopicPython Strings




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