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为什么这个Python字典会反复写入文件？

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我的程序具有将问题添加到字典中的功能，“问题”稍后被写入文本文件 . 我添加了输入另一个问题的选项，而不是再次浏览菜单;你能解释一下为什么这段代码：

def add_info():

    #ask what IF want to add fact
    decision = input("You've selected '1' to add a fact. Are you sure you would you like to add a fact? \
    \n(Respond with 'y' or 'n')\n").title()
    #IF they WANT TO ADD A FACT
    if decision == 'Y':
        print('I am going to ask for the question and the answer next.')

    while True:
        review2 = open('review.txt', 'r')
        reviewing = review2.readlines()
        review2.close()
        x=len(reviewing)+1
        question = input('Please type the question you want displayed:\n')
        questionz.append(question)
        answer = str(input('Please type the answer you want displayed\n'))
        solution = {
        }
        solution[question] = answer
        questions[x]= solution
        review = open('review.txt', 'a')
        review.write(str(questions))
        review.write("\n")
        review.close()
        #asks if want to add ANOTHER
        decision2= input('Would you like to add another fact?\
        \n(Please answer "y" ot "n")\n').title()
        if decision2 == "N":
            menu()
            break
        elif decision2 =='Y':
            continue

当我尝试在函数中添加另一个问题时写这个吗？：

{1: {'3+3?': '6'}}
{2: {'4+5?': '9'}}
{3: {'2+6?': '8'}}
{4: {'5?': '5'}}
{4: {'5?': '5'}, 5: {'6?': '6'}}

（问题1,2和3已经单独添加，我输入'5？'作为问题，'5'作为答案，'6？'作为下一个问题，'6'作为下一个答案，并重写第五个问题代替第五个问题，然后添加一个逗号 . 我没有重新输入任何内容 . ）

python function file writing

1 回答

  • 0

    我相信这就是你所追求的：

    import os


def add_info():
    # ask what IF want to add fact
    decision = input("You've selected '1' to add a fact. Are you sure you would you like to add a fact? \
    \n(Respond with 'y' or 'n')\n").upper()

    # IF they WANT TO ADD A FACT
    if decision == 'Y':
        print('I am going to ask for the question and the answer next.')
        questions = []

        if os.path.isfile('review.txt'):
            review = open('review.txt', 'r', encoding='utf-8')
            index = len(review.readlines()) + 1
            review.close()
        else:
            index = 1

        while True:
            question = input('Please type the question you want displayed:\n')

            answer = input('Please type the answer you want displayed:\n')

            nextQuestion = {}
            nextQuestion[index] = {}
            nextQuestion[index][question] = answer

            questions.append(nextQuestion)

            index += 1

            if input('Would you like to add another fact?\n(Please answer "y" ot "n")\n').upper() == 'N':
                break;

        if os.path.isfile('review.txt'):
            review = open('review.txt', 'a', encoding='utf-8')
            for x in questions:
                review.write(str(x) + '\n')
            review.close()
        else:
            review = open('review.txt', 'w')
            for x in questions:
                review.write(str(x) + '\n')
            review.close()


add_info()

    我使用os.path测试文件's existence so you wouldn' t获取错误，如果它不存在 . 我还移动了一些东西，所以代码更容易阅读，你的代码中有一些错误，如 questionz 和 questions 可能试图引用相同的变量 . 希望这可以帮助 .

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