15.7. Exercises

21. 1. Fill in the parameter list for g so that the invocations of g yield the return values specified

    def g(): return 2*x + y + z print(g(3)) # should output 10 print(g(3, 2)) # should output 8 print(g(3, 2, 1)) #should output 9

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22. 2. Define a function called nums that has three parameters. The first parameter, an integer, should be required. A second parameter named mult_int should be optional with a default value of 5. The final parameter, switch, should also be optional with a default value of False. The function should multiply the two integers together, and if switch is True, should change the sign of the product before returning it.

    def nums(): pass #remove this once you start writing the function ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertEqual(nums(5), 25, "Testing the function nums on input 5.") self.assertEqual(nums(2, mult_int = 4), 8, "Testing the function nums on inputs 2, mult_int = 4.") self.assertEqual(nums(3, switch = True), -15, "Testing the function nums on inputs 3, switch = True.") self.assertEqual(nums(4, mult_int = 3, switch = True), -12, "Testing the function nums on inputs 4, mult_int = 3, switch = True.") self.assertEqual(nums(0, switch = True), 0, "Testing the function nums on inputs 0, switch = True.") myTests().main()

23. 3. Write a function called together that takes three parameters, the first is a required parameter that is a number (integer or float), the second is a required parameter that is a string, and the third is an optional parameter whose default is “ “. What is returned is the first parameter, concatenated with the second, using the third.

    ==== from unittest.gui import TestCaseGui class myTests(TestCaseGui): def testOne(self): self.assertEqual(together(12, 'cats'), '12 cats', "Testing that together returns the correct string on input (12, 'cats')") self.assertEqual(together(17.3, 'birthday cakes'), '17.3 birthday cakes', "Testing that together returns the correct string on input (17.3, 'birthday cakes')") self.assertEqual(together(3, 'dogs', ': '), '3: dogs', "Testing that together returns the correct string on input (3, 'dogs', ': ')") self.assertEqual(together(493.3, 'beans', ' lima '), '493.3 lima beans', "Testing that together returns the correct string on input (493.3, 'beans', 'lima')") myTests().main()

15.7.1. Contributed Exercises

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