.Please post answer who is expert in Python!! so I wanna answers of Python OOP experts

Explain the following code how its work step by step then show what its print out but DONT POST ONLY OUTPUT as I said explain step by step

def test A(): raise ValueError() def test B(): raise TypeError() def test_c): raise KeyError def test_D(): return "Hello" def status function ): retval-0 try: except ValueError: except TypeError: except Exception as e: retval - function() retval = 10 retval = 22 retval 35 retval+= retval retwal 2 else: inally: return retva.l print status testA)) print ( status( test_B)) print ( status( test C)) print status( test_D))