Seite - 92 - in Programming for Computations – Python - A Gentle Introduction to Numerical Simulations with Python 3.6, Band Second Edition

92 4 FunctionsandtheWritingofCode print(’\n*** Welcome to the times tables test! ***\ \n (To stop: ctrl-c)’) # Ask user for a*b, ... a, b are in [1, N] N = 2 score = 0 for i in range(1, N+1, 1): for j in range(1, N+1, 1): user_answer = ask_user(i, j) score = score + points(i, j, user_answer) print(’Your score is now: {:d}’.format(score)) print(’\nFinished! \nYour final score: {:d} (max: {:d})’\ .format(score, N*N)) Running theprogram, thedialoguecould, forexample,proceedlike *** Welcome to the times tables test! *** (To stop: ctrl-c) 1 * 1 = 1 Correct! Your score is now: 1 1 * 2 = 2 Correct! Your score is now: 2 2 * 1 = 3 Sorry! Correct answer was: 2 Your score is now: 2 2 * 2 = 4 Correct! Your score is now: 3 Finished! Your final score: 3 (max: 4) Weseethat thebehavior isasexpected.Again, it is important thatyoureadthecode andconfirmthatyourunderstandingis in linewith theoutputshown. Testing forEquality with== Inourcode,we compare two integers in theif test if user_answer == true_answer: Testing for equality with == works fine for the integers we have here. In general, however, such tests need to account for the inexact number representation thatwehaveoncomputers.Moreabout this inSect.6.6.3. Note that thenewcodeimplementedwhenupdatingfromtimes_tables_1.py totimes_tables_2.py, included the functionbodies in both functionsask_user