The isalnum Method in Python: Checking a String for Letters and Numbers

Returns True or False, indicating whether the string contains only numbers and/or letters.

isalnum()¶

Returns True if the string has at least one character and all characters are numbers and/or letters; otherwise, returns False.

''.isalnum()  # False
'  '.isalnum()  # False
'!@#'.isalnum()  # False
'abc'.isalnum()  # True
'123'.isalnum()  # True
'abc123'.isalnum()  # True