Oops, try again. The following exception was raised when calling the_flying_circus(): NameError: global name 'answer' is not defined
The error says that answer isn't defined. You have many way to do that, you could add a raw_input and save it inside answer or you could change answer > 10 to a boolean.
if 2 * 10 == 20 and 10 % 2 == 0:
answer = raw_input("please type a number : ")