# the following variable would be set as the result of a runtime calculation:
x = input("Do you need the answer? (y/n): ")
if x.lower() == "y":
required = True
else:
required = False
def the_answer(self, *args):
return 42
def augment_answer(cls):
if required:
cls.the_answer = the_answer
# we have to return the class now:
return cls