Question

Write a function called oops that explicitly raises a Index Error exception when called. Then write another function that calls oops inside a try/except statement to catch the error. What happens if you change oops to raise Key Error instead of Index Error?

Answer 1

def oops():
    raise IndexError("Index is out of range")

def call_oops():
    try:
        oops()
    except IndexError as error:
        print("Caught IndexError:", error)

call_oops()

Output:

Caught IndexError: Index is out of range

If oops() is changed to raise KeyError, the except IndexError block will not match it. The KeyError will remain unhandled and will propagate to the caller, usually terminating the program with a traceback. It can be caught by adding except KeyError or by catching a suitable common exception class.