Answer 1

Value Error is Exception Error - Exceptions handling in Python is very similar to Java. The code, which harbours the risk of an exception, is embedded in a try block. But whereas in Java exceptions are caught by catch clauses, we have statements introduced by an "except" keyword in Python. It's possible to "create custom-made" exceptions: With the raise statement it's possible to force a specified exception to occur.

read more here: https://docs.python.org/3/tutorial/errors.html