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Python string | isalnum()
  • Difficulty Level : Basic
  • Last Updated : 05 Jan, 2018

isalnum() function in Python programming language checks whether all the characters in a given string is alphanumeric or not.

Alphanumeric:A character that is either a letter or a number

Syntax:

string_name.isalnum()
string_name is the name of the string

Parameter: isalnum() method takes no parameters



Return:

True: If all the characters are alphanumeric
False: If one or more characters are not alphanumeric

Below is the Python implementation of the isalnum() method




# Python program to demonstrate the use of
# isalnum() method  
  
# here a,b and c are characters and 1,2 and 3
# are numbers
string = "abc123"
print(string.isalnum())
  
# here a,b and c are characters and 1,2 and 3 
# are numbers but space is not a alphanumeric 
# character
string = "abc 123" 
print(string.isalnum()) 

Output:

True
False

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