Web Reference: Definition and Usage The isalnum() method returns True if all the characters are alphanumeric, meaning alphabet letter (a-z) and numbers (0-9). Example of characters that are not alphanumeric: (space)!#%&? etc. Apr 21, 2025 · The isalnum () method is a string function in Python that checks if all characters in the given string are alphanumeric. If every character is either a letter or a number, isalnum () returns True. The syntax of the isalnum()method is: Here, the isalnum() method checks if all the characters of stringare alphanumeric or not.
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