Python代码报错‘FinalGrade is not defined’：如何找出最高成绩学生？

错误原因分析 #

1. finalGrade是aveGrade函数内部的局部变量，函数外部无法直接访问，导致主函数调用max(finalGrade)时触发未定义错误
2. 未将学生姓名与对应的最终成绩关联存储，无法匹配成绩最高的学生
3. 原代码中max(studentnames)仅会返回姓名字典序最大的学生，并非成绩最高者

修复后的完整代码 #

def welcome():
    print("Hello and Welcome to Top Students")
    print("Our program lists your students and displays the highest of honors")
    print("Let's get started\n")

def aveGrade():
    quizGrade = int(input("What is the grade this student is receiving for their quiz?\n"))
    # 修正拼写错误：prarticipation → participation
    partGrade = int(input("What is the grade this student is receiving for their participation?\n"))
    # 修正语法错误：去掉重复的is
    assignGrade = int(input("What is the grade this student is receiving for their assignment?\n"))
    finalGrade = ((quizGrade * .35) + (partGrade * .15) + (assignGrade * .50))
    print("The final grade for this student is", finalGrade)
    # 返回计算好的最终成绩，供主函数存储
    return finalGrade

def main():
    welcome()
    studentnames = ["Fred", "Daphne", "Velma", "Norville"]
    # 用字典存储学生姓名与对应最终成绩
    student_grades = {}
    for student in studentnames:
        print("The current grade standing for", student, "are as follows:\n")
        # 接收aveGrade返回的成绩并存入字典
        student_grades[student] = aveGrade()
    
    # 找到成绩最高的学生：通过max函数的key参数指定按成绩排序
    top_student = max(student_grades, key=student_grades.get)
    top_score = student_grades[top_student]
    print(f"The student with the highest final grade is {top_student} with a total of {top_score}")

# 调用主函数执行程序
if __name__ == "__main__":
    main()

关键修改点 #

• 返回成绩：修改aveGrade函数，让其返回计算后的finalGrade，使主函数能获取并存储每个学生的成绩
• 存储关联数据：使用字典student_grades存储学生姓名与成绩的对应关系，解决成绩与学生匹配的问题
• 修正拼写/语法错误：修复了prarticipation的拼写错误和输入语句中的重复is
• 正确获取最高分：利用max()函数的key参数，基于字典的值（成绩）找到对应学生，而非仅比较姓名

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