使用Python比較列表？

Question

我對python相當陌生，剛開始這個學期的課程。我努力想辦法編寫一個代碼，將正確的答案存儲爲列表，然後從txt文件中讀取20個問題中的每一個的學生答案，並將答案存儲在另一個列表中。之後，我想比較列表，然後打印答案，程序將顯示一條消息，指示學生是否通過（15或更大的正確是通過），總數正確，總數不正確。所以例如正確答案爲A，C，A，A，D，B，C，A，C，B，A，D，C，A，D，C，B，B，D，A。學生的答案只是創建自己的文本文件來測試。任何幫助，將不勝感激我目前的格式似乎並不奏效，如下所示。

高清的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.') 

的main（）

這裏是更新的程序仍然似乎給問題。我使用的是學生的答案是 ACAADBCACBADCADCBBDAC AADBCACBADCADCBBDD

高清的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.') 

的main（）

Answer 1

可以計算total這樣

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

荏苒兩個列表

它比增加速度快2倍以上total在這個更緊湊但更慢的方式：

total += int(stdnt_ans == correct_ans) 

Answer 2

這將得到您的總和。只需要調整你做循環的方式。

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')