How do I raise an exception in Python?

How do I raise an exception in Python?

In Python, you can raise an exception using the raise statement. For example: raise ValueError('Invalid value').

Can you show me an example of raising a custom exception?

Sure! You can define a custom exception like this:

class MyCustomError(Exception):
    pass

raise MyCustomError('This is a custom error!')

What happens if I don't handle the exception?

If you don't handle the exception, it will propagate up the call stack and may cause your program to terminate.

How can I catch exceptions in Python?

You can catch exceptions using a try and except block. For example:

try:
    # code that may raise an exception
except ValueError:
    print('Caught a ValueError!')