Hykilpikonna
110 lines
3.5 KiB
Python
Executable File
110 lines
3.5 KiB
Python
Executable File
"""CSC110 Fall 2021 Assignment 1, Part 3: Debugging Exercises
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Instructions (READ THIS FIRST!)
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===============================
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This Python module contains the program and tests described in Part 3.
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You can run this file as given to see the pytest report given in the handout.
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Your task is to fix all errors in this file so that each test passes
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(see assignment handout for details).
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Copyright and Usage Information
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===============================
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This file is provided solely for the personal and private use of students
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taking CSC110 at the University of Toronto St. George campus. All forms of
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distribution of this code, whether as given or with any changes, are
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expressly prohibited. For more information on copyright for CSC110 materials,
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please consult our Course Syllabus.
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This file is Copyright (c) 2021 David Liu, Mario Badr, and Tom Fairgrieve.
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"""
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import math
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import pytest
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###############################################################################
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# Professor Xavier's program
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###############################################################################
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def class_average(class_grades: list) -> float:
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"""Return the weighted average grade of students for all grades in class_grades.
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Each element of class_grades is itself a list, containing three floats
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representing the grades of a particular student on the three assignments.
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See assignment handout for details.
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You may ASSUME that:
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- class_grades is non-empty
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- class_grades contains only lists
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- the lists in class_grades contain exactly three floats
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- each float in each list is between 0.0 and 100.0.
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"""
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student_averages = [student_average(grades) for grades in class_grades]
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# Return the average grade across all students in this section
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return sum(student_averages) / len(student_averages)
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def student_average(grades: list) -> float:
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"""Return the weighted average of a student's grades.
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You may ASSUME that:
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- grades consists of exactly three float values
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"""
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# Sort the student's grades
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sorted_grades = sorted(grades)
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# These are the weights for the assignment grades
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weights = [0.25, 0.35, 0.4]
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return (
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weights[0] * sorted_grades[0] +
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weights[1] * sorted_grades[1] +
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weights[2] * sorted_grades[2]
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)
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###############################################################################
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# Tests for section_average
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###############################################################################
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def test_section_average_all_grades_equal() -> None:
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"""Test section_average when students have the same grade on each assignment.
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"""
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grades = [[80.0, 80.0, 80.0],
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[90.0, 90.0, 90.0]]
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expected = 85.0
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actual = class_average(grades)
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assert math.isclose(actual, expected)
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def test_class_average_no_grades_equal() -> None:
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"""Test class_average when every grade is different.
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"""
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grades = [[60.0, 70.0, 75.0], [80.0, 65.0, 85.0]]
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expected = 73.875
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actual = class_average(grades)
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assert math.isclose(actual, expected)
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def test_class_average_many_students() -> None:
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"""Test class_average when there are a lot of students in a section.
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"""
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grades = [[80.0, 70.0, 75.0],
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[90.0, 78.0, 65.0],
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[66.0, 74.0, 60.0],
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[60.0, 55.0, 75.0],
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[82.0, 80.0, 88.0],
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[50.0, 88.0, 73.0]]
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expected = 74.15
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actual = class_average(grades)
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assert math.isclose(actual, expected)
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if __name__ == '__main__':
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pytest.main(['a1_part3.py', '-v'])
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