How can I validate user input in Python?

How can I validate user input in Python?

You can use various methods like regular expressions, type checking, and custom validation functions.

Can you show me an example using regular expressions?

Sure! Here's a simple example to validate an email address:

import re

def is_valid_email(email):
    pattern = r'^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$'
    return re.match(pattern, email) is not None

What about validating numeric input?

For numeric input, you can use the isinstance() function or try-except blocks to handle exceptions. Here's an example:

try:
    number = int(input('Enter a number: '))
except ValueError:
    print('Invalid input! Please enter a valid number.')

Are there libraries that can help with input validation?

Yes, libraries like Cerberus and Pydantic are great for more complex validation needs.