15.6. 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

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()

15.6.1. Contributed Exercises

Q-1: After completing the reading, what concepts are still unclear to you? If nothing is unclear, what did you find most interesting?

Write a function named add_wvu(). It should accept one parameter, an optional parameter named colleges designed to take a list. If an existing list is not provided for colleges when calling your function, your function should create a new list.

Your function must append an entry containing “WVU” to the colleges list, and return the updated list.

Be careful that if add_wvu() is called multiple times, any lists it generates are new and independent from other previously returned lists.

====

Create a lambda function that is designed to manipulate a dictionary, such as by returning the keys or values. Store the lambda function as lambda_func.

campuses = {'WVU Main Campus': 'Morgantown', 'Potomac State College' : 'Keyser', 'WVU Institute of Technology': 'Beckley'} lambda_func = # write your lambda function here print(lambda_func(campuses)) ====

Create a function intadd that accepts two integers x and y. The first integer x should have a default value of 7 and the second integer y should have a default value of 3. The function should add the two integers and return this value.

==== from unittest.gui import TestCaseGui import re class myTests(TestCaseGui): def testOne(self): self.assertTrue('def' in self.getEditorText(), 'function created') self.assertTrue(intadd(3,4)==7, '1st situation checked') self.assertTrue(intadd(3)==6, '2nd situation checked') self.assertTrue(intadd(y=4)==11, '3rd situation checked') myTests().main()

Q-1: Given the following sequence of stack operations, what is the top item on the stack when the sequence is complete?

m = Stack()
m.push('x')
m.push('y')
m.push('z')
while not m.isEmpty():
    m.pop()
    m.pop()

• 'x'
• You may want to check out the docs for isEmpty
• the stack is empty
• There is an odd number of things on the stack but each time through the loop 2 things are popped.
• an error will occur
• Good Job.
• 'z'
• You may want to check out the docs for isEmpty

Below is a program that simulates the rolling of dice. Modify this code and use it to simulate the 100 rolls of 5, 10 sided dice. Store the average roll in a variable called solution rounded to the nearest integer.

import random random.seed(3) def initialize(num_dice, n_sides=6): d={} for i in range(num_dice): d[i+1] = n_sides return d def roll(d, nrolls=1): result = 0 for die, sides in d.items(): result += random.randint(1,sides) return result def get_average(values): pass def main(): solution = 0 dice = initialize(2) print(roll(dice)) return solution solution = main() ===== from unittest.gui import TestCaseGui def result_hider(a, b): if a == b: return True class myTests(TestCaseGui): def testOne(self): self.assertEqual(result_hider(27, solution), True, "Testing") myTests().main()

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