MOOC 2025 Python课程评分编程题输出不符问题求助

核心错误分析 #

1. 习题点数计算逻辑完全偏离题目规则 #

题目明确：总习题40道，完成至少10%（4道）得1分，至少20%（8道）得2分……完成100%（40道）得10分。但现有代码用ex_pt = exer_nmbr // 10，还错误添加if ex_pt >=4: ex_pt=10，导致计算完全错误：

• jaana完成27道习题，按规则应得6分（27≥24，对应60%比例），但代码计算为2分，最终总分2+11=13，低于15阈值，返回0分，与预期不符。
• liisa完成35道习题，按规则应得8分（35≥32，对应80%比例），代码计算为3分，最终总分3+14=17，返回1分，与预期不符。

正确的计算逻辑应为：用完成的习题数除以4（40道的10%为4道），取整数部分，且上限为10：

ex_pt = min(exer_nmbr // 4, 10)

2. 文件读取存在语法错误 #

代码中line.split(";").strip()是错误写法——split(";")返回列表，列表没有strip()方法，会触发AttributeError。正确写法是先对整行去除首尾空白，再分割：

line_content = [word.strip() for word in line.strip().split(";")]

修正后的完整代码 #

# write your solution here
def get_student_matrix(filename: str):
    student_matrix = {}
    with open(filename) as new_file:
        for line in new_file:
            line_content = [word.strip() for word in line.strip().split(";")]
            if line_content[0] != "id":
                student_matrix[line_content[0]] = f"{line_content[1]} {line_content[2]}"
    return student_matrix


def get_exercise_matrix(filename: str):
    exercise_matrix = {}
    with open(filename) as new_file:
        for line in new_file:
            line_content = [word.strip() for word in line.strip().split(";")]
            if line_content[0] != "id":
                exercise_matrix[line_content[0]] = sum([int(w) for w in line_content[1:]])
    return exercise_matrix


def get_exam_points_matrix(filename: str):
    exam_points_matrix = {}
    with open(filename) as new_file:
        for line in new_file:
            line_content = [word.strip() for word in line.strip().split(";")]
            if line_content[0] != "id":
                exam_points_matrix[line_content[0]] = sum([int(w) for w in line_content[1:]])
    return exam_points_matrix


def grade(exer_nmbr: int, exm_pt: int) -> int:
    # 修正习题点数计算逻辑
    ex_pt = min(exer_nmbr // 4, 10)
    ex_pt = max(ex_pt, 0)  # 确保最低为0分
    points = ex_pt + exm_pt

    if points < 15:
        return 0
    if 15 <= points <= 17:
        return 1
    if 18 <= points <= 20:
        return 2
    if 21 <= points <= 23:
        return 3
    if 24 <= points <= 27:
        return 4
    return 5


def main():
    if False:
        # user input
        student_info = input("Student information: ")
        exercise_data = input("Exercises completed: ")
        exam_info = input("Exam points: ")
    else:
        # hard-coded input
        student_info = "students1.csv"
        exercise_data = "exercises1.csv"
        exam_info = "exam_points1.csv"

    students = get_student_matrix(student_info)
    exercises = get_exercise_matrix(exercise_data)
    exam_points = get_exam_points_matrix(exam_info)

    for student in students:
        if (student in exam_points) and (student in exercises):
            print(f"{students[student]} {grade(exercises[student], exam_points[student])}")


main()

验证结果 #

运行修正后的代码，输出与题目预期完全一致：

pekka peloton 0
jaana javanainen 1
liisa virtanen 3

内容的提问来源于stack exchange，提问作者TheSelfTaughtNoob