2-more_exercises

2/17/24, 7:37 AM 2-more_exercises https://inst-fs-iad-prod.inscloudgate.net/files/63a3952e-76eb-48fe-8842-92f453f2a0e1/nb1.2 solutions.html?token=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzUxMiJ9.e… 3/10 Exercise 1 ( assignments_test : 1 point). Complete the function get_assignments . The function takes grades (a nested list structured similarly to grades above) as a parameter. It should return a new list assignments which holds the names of the class assignments. (These appear in the descriptive header element of grades .) In [7]: def get_assignments(grades): ### ### YOUR CODE HERE ### return grades[0][1:] The demo cell below should display ['Exam 1', 'Exam 2', 'Exam 3'] In [8]: assignments = get_assignments(grades) assignments The following test cell will check your function against several randomly generated test cases. In [9]: import nb_1_2_tester tester = nb_1_2_tester.Tester_1_2_1() for _ in range(20): try : tester.run_test(get_assignments) (input_vars, original_input_vars, returned_output_vars, true_o utput_vars) = tester.get_test_vars() except : (input_vars, original_input_vars, returned_output_vars, true_o utput_vars) = tester.get_test_vars() raise print('Passed. Please submit!') Exercise 2 ( grade_lists_test : 1 point). Complete the function for build_grade_lists , again taking grades as a parameter. The function should return a new dictionary , named grade_lists , that maps names of students to lists of their exam grades. The grades should be converted from strings to integers. For instance, grade_lists['Thorny'] == [100, 90, 80] . Out[8]: ['Exam 1', 'Exam 2', 'Exam 3'] Passed. Please submit!

2/17/24, 7:37 AM 2-more_exercises https://inst-fs-iad-prod.inscloudgate.net/files/63a3952e-76eb-48fe-8842-92f453f2a0e1/nb1.2 solutions.html?token=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzUxMiJ9.e… 6/10 Exercise 4 ( avg_grades_by_student_test : 1 point). Complete the function build_avg_by_student , taking grades as a parameter and returning a dictionary named avg_by_student that maps each student to his or her average exam score. For instance, avg_grades_by_student['Thorny'] == 90 . You may find solutions to earlier exercises useful for completing this one. Feel free to use them! Hint. The statistics (https://docs.python.org/3.5/library/statistics.html) module of Python has at least one helpful function. In [16]: # Create a dict mapping names to grade averages. def build_avg_by_student(grades): ### ### YOUR CODE HERE ### grade_lists = build_grade_lists(grades) from statistics import mean return {n: mean(G) for n, G in grade_lists.items()} The demo cell below should display {'Thorny': 90, 'Mac': 99.33333333333333, 'Farva': 56, 'Rabbit': 62.333333333333336, 'Ursula': 78.33333333333333, 'Foster': 95.66666666666667} In [17]: avg_grades_by_student = build_avg_by_student(grades) avg_grades_by_student Out[17]: {'Thorny': 90, 'Mac': 99.33333333333333, 'Farva': 56, 'Rabbit': 62.333333333333336, 'Ursula': 78.33333333333333, 'Foster': 95.66666666666667}

2/17/24, 7:37 AM 2-more_exercises https://inst-fs-iad-prod.inscloudgate.net/files/63a3952e-76eb-48fe-8842-92f453f2a0e1/nb1.2 solutions.html?token=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzUxMiJ9.e… 9/10 In [24]: import nb_1_2_tester tester = nb_1_2_tester.Tester_1_2_6() for _ in range(20): try : tester.run_test(build_avg_by_asn) (input_vars, original_input_vars, returned_output_vars, true_o utput_vars) = tester.get_test_vars() except : (input_vars, original_input_vars, returned_output_vars, true_o utput_vars) = tester.get_test_vars() raise print('Passed. Please submit!') Exercise 7 ( rank_test : 2 points). Complete the function get_ranked_students which takes grades as an argument and returns a new list, ranked_students , which contains the names of students in order by decreasing score. That is, ranked_students[0] should contain the name of the top student (highest average exam score), and ranked_students[-1] should have the name of the bottom student (lowest average exam score). You may find solutions to earlier exercises useful for completing this one. Feel free to use them! In [25]: def get_ranked_students(grades): ### ### YOUR CODE HERE ### avg_grades_by_student = build_avg_by_student(grades) return sorted(avg_grades_by_student, key=avg_grades_by_student.ge t, reverse= True ) The demo cell below shuould display ['Mac', 'Foster', 'Thorny', 'Ursula', 'Rabbit', 'Farva'] In [26]: rank = get_ranked_students(grades) rank In [27]: import nb_1_2_tester tester = nb_1_2_tester.Tester_1_2_7() for i in range(5): try : tester.run_test(get_ranked_students) (input_vars, original_input_vars, returned_output_vars, true_o utput_vars) = tester.get_test_vars() except : (input_vars, original_input_vars, returned_output_vars, true_o utput_vars) = tester.get_test_vars() raise print('Passed. Please submit!') Passed. Please submit! Out[26]: ['Mac', 'Foster', 'Thorny', 'Ursula', 'Rabbit', 'Farva'] Passed. Please submit!