How do I raise an exception in a Python function?

How do I raise an exception in a Python function?

You can raise an exception in a Python function using the 'raise' keyword followed by the exception type. For example, 'raise ValueError("Invalid input")'.

Can you show me an example of a function that raises an exception?

Sure! Here's a simple example:

def check_positive(number):
    if number < 0:
        raise ValueError("Number must be positive")
    return number

What happens if I don't handle the exception?

If you don't handle the exception, it will propagate up the call stack and terminate the program, displaying an error message.

How can I handle exceptions in my code?

You can handle exceptions using a try-except block. For example:

try:
    check_positive(-1)
except ValueError as e:
    print(e)