使用 Python 比较列表？

Question

我对 python 还很陌生，本学期才开始学习这门课程。我正在努力寻找一种编写代码的方法，该代码将正确答案存储为列表，然后从 txt 文件中读取 20 个问题中每个问题的学生答案，并将答案存储在另一个列表中。之后，我想比较列表，然后打印他们的答案，程序将显示一条消息，指示学生是否通过，（15 或更大的正确是通过）和总数正确和总数不正确。所以例如正确的答案为 A，C，A，A，D，B，C，A，C，B，A，D，C，A，D，C，B，B，D，A。对于学生的答案将只是创建您的自己的文本文件进行测试。任何帮助将不胜感激我目前的格式似乎不起作用，如下所示。

def main():

total = 0
index = 0
answers = [ 'A', 'C', 'A', 'A', 'D',\
            'B', 'C', 'A', 'C', 'B',\
            'A', 'D', 'C', 'A', 'D',\
            'C', 'B', 'B', 'D', 'A']

student_answers = open('student_solution.txt', 'r')

for answer in student_answers:
    print(answer.strip())

    while index in answers == student_answers:
        if student_answers[0] == answers[0]:
            total +=1
        else:
            total +=0



student_answers.close()
print('Total correct answers: ', total)
print('Total of incorrect answers: ', 20 - total)

if total >= 15:
    print('Congratulations! You passed the exam.')
else:
    print('Sorry, you have failed the exam.')

main()

这是似乎仍然存在问题的更新程序。我正在使用的学生答案是 A C A A D B C A C B A D C A D C B B D A C A A D B C A C B A D C A D C B B D D

def main():

total = 0
index = 0
answers = [ 'A', 'C', 'A', 'A', 'D',\
            'B', 'C', 'A', 'C', 'B',\
            'A', 'D', 'C', 'A', 'D',\
            'C', 'B', 'B', 'D', 'A']

infile = open('student_solution.txt', 'r')

student_answers = infile.readline()
infile.close()
print(student_answers)

for answer in student_answers:
    for y in range(len(answer)):
        if answer[y] == answers[y]:
            total += 1


print('Total correct answers: ', total)
print('Total of incorrect answers: ', 20 - total)

if total >= 15:
        print('Congratulations! You passed the exam.')
else:
        print('Sorry, you have failed the exam.')

main()

Answer 1

你可以通过这种方式计算total 压缩两个列表

total = 0
for stdnt_ans,correct_ans in zip(student_answers, answers):
    if stdnt_ans == correct_ans:
        total += 1

它比以这种更紧凑但更慢的方式递增 total 快 2 倍以上：

total += int(stdnt_ans == correct_ans)

Answer 2

这将得到您的总数。只需要调整你循环的方式。

def main():

    total = 0
    index = 0
    answers = [ 'A', 'C', 'A', 'A', 'D',\
                'B', 'C', 'A', 'C', 'B',\
                'A', 'D', 'C', 'A', 'D',\
                'C', 'B', 'B', 'D', 'A']

    student_answers = [[ 'A', 'C', 'A', 'A', 'D',\
                'B', 'C', 'D', 'C', 'B',\
                'A', 'D', 'C', 'A', 'D',\
                'C', 'B', 'A', 'D', 'A'],\
                [ 'A', 'C', 'D', 'D', 'D',\
                'A', 'C', 'A', 'D', 'B',\
                'D', 'D', 'C', 'A', 'D',\
                'B', 'B', 'B', 'D', 'A']]

    for answer in student_answers:
        for i in range(len(answer)):
            if answer[i] == answers[i]:
                total += 1
        print('Total correct answers: ', total)
        print('Total of incorrect answers: ', 20 - total)
        if total >= 15:
            print('Congratulations! You passed the exam.')
        else:
            print('Sorry, you have failed the exam.')
        total = 0

main()

Answer 3

for index, value in enumerate(answers):
    total += int(value == student_answers[index])

 print('Pass' if total >= 15 else 'Fail')