Python String isalnum() method

The isalnum() method is used to check that all the characters of a non-empty string are alphanumeric and there is at least one character in the string. This method returns True if the given string only has alphanumeric characters and the length of the string is a minimum of one character.

Syntax:

String_var.isalnum()

This method accepts no parameter.

Return Value:
True If the given string only has alphanumeric characters.
False If the given string has any non-alphanumeric character. 
			

# Python example of the isalnum() method

website = "tutorialsnation"
print(website. isalnum ())   #return True

website = "tutorials nation"
print(website. isalnum ())   #return False it contains white space

website = "@tutorialsnation"
print(website. isalnum ())   #return False it contains special character

Output:

True False False

Alphanumeric means either letters or number or both and white spaces are not alphanumeric

			

string = "Tutorials Nation" 
print(string.isalnum()) # this returns 'False'
string = "TutotialsNation" 
print(string.isalnum()) # this returns 'True'

Output:

False True

Here is an example of removing all non-alphanumeric elements from a list.

			

pythonlist=['Mercury','$$','500','Venus','%','^^','90']
for el in pythonlist:
   if el.isalnum():
        print(w)

Output:

Mercury 500 Venus 90

If you want to print all non-alphanumeric elements from the list.

			

pythonlist=['Mercury','$$','500','Venus','%','^^','90']
for el in pythonlist:
   if not el.isalnum():
        print(el)

Output:

$$ % ^^ >