How to determine that the data entered by the user is a number?

Question

Python

a = int(input('Your age > '))
If the user enters characters that are not numbers, then an error will occur because the variable is int. It is necessary that when the user writes any data that is not a number, a certain code occurs, and not an error.

Answer 1

In Python, input() returns a string. A string has many methods, some of them are checking the string for belonging to one or another type of character. One such method, .isdigit() returns a boolean whether the string contains only digits. You can use this method to validate entered characters.

Answer 2

if a == 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ' or a == 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ':