How can I check if a string contains only digits in Python?

How can I check if a string contains only digits in Python?

You can use the isdigit() method in Python. For example, my_string.isdigit() will return True if all characters are digits.

What if I want to check for alphanumeric characters?

You can use the isalnum() method. It returns True if all characters in the string are alphanumeric.

Are there any other methods for string validation?

Yes, you can use regular expressions with the re module for more complex validations.

Can you show me an example using regular expressions?

Sure! You can use re.match(r'^[A-Za-z0-9]+$', my_string) to check if a string contains only letters and numbers.