Question

我正在为我的CS课程编写一个程序来计算成绩的加权平均值，但在尝试运行它几次之后，我继续得到这个奇怪的内置错误。我不知道问题是什么，因此很有可能在我的其他一些定义中出现同样的问题。

def main():
    #user inputs grades into a set of lists
    assignmentList = [float(input('assignment scores: ')) for grade in range(14)]
    quizList = [float(input('quiz scores: ')) for grade1 in range(4)]
    wExamList = [float(input('written exam scores: ')) for grade2 in range(2)]
    lExamList = [float(input('lab exam scores: ')) for grade3 in range(2)]
    finalExam = [float(input('final exam score: ')) for grade4 in range(1)]
    print()

    #import the definitions
    gradeAvg = round(assignments(assignmentList) + quizzes(quizList) + writtenExams(wExamList) + labExams(lExamList) + finalExam(finalExam), 2)
    print('Overall grade:', gradeAvg)

    #create elifs to figure out Letter grades
    if gradeAvg <= 93:
        print('Letter grade: A') 
    elif 90 <= gradeAvg > 93:
        print('Letter grade: A-')
    elif 87 <= gradeAvg >89:
        print('Letter grade: B+')
    elif 83 <= gradeAvg > 87:
        print('Letter grade: B')
    elif 80<= gradeAvg > 83:
        print('Letter grade: B-')
    elif 77 <= gradeAvg >80:
        print('Letter grade: C+')    
    elif 73 <= gradeAvg >77:
        print('Letter grade: C') 
    elif 70 <= gradeAvg >73:
        print('Letter grade: C-') 
    elif 67<= gradeAvg >70:
        print('Letter grade: D+')
    elif 60 <= gradeAvg >67:
        print('Letter grade: D')
    else:
        print('Letter grade: F')

def assignments(assignment):
    list1 = [assignment]

    #sort assignments and delete the lowest score
    list1.sort()
    del list1[0]

    #get the weighted average for homework
    assignAvg = sum(list1)
    assignAvg = round((assignAvg / 14) * .25, 2)
    return assignAvg

def quizzes(quiz):
    list2 = [quiz]
    list2.sort()

    #weighted average for quizzes
    quizAvg = (sum(list2))
    quizAvg1 = round((quizAvg / 4) * .15, 2)
    return quizAvg1

def writtenExams(wExam):
    list3 = [wExam]

    #weighted average for written exams
    examAvg = sum(list3)
    examAvg1 = round((examAvg / 2) * .20, 2)
    return examAvg1

def labExams(lExam):
    list4 = [lExam]

    examAvg = sum(list4)
    examAvg2 = round((examAvg / 2) * .20, 2)
    return examAvg2

def finalExam(fExam):
    list5 = [fExam]
    examAvg = sum(list5)
    examAvg3 = round(examAvg * .20, 2)
    return examAvg3

main()

错误的第一个实例是第66行，其中'quizAvg =（sum（list2））'

Answer 1

quizList是list。您将其传递给quizzes()。然后你做list2 = [quiz]。这不仅不会生成quiz的单独副本，而是将其包装在另一个list中。你会得到这样的东西：

[[1, 3, 3, 2, 4]]

这意味着当您将其发送到sum()时，它会尝试将第一个元素添加到默认的起始值0，这意味着它在内部执行0 + [1, 3,...] - 并且它在那里添加了{ {1}}和int。

相反，请单独制作一个副本进行排序，不要更改结构：

list

builtins.TypeError：+：'int'和'list'不支持的操作数类型

1 个答案: