保存并能够在 python 3 中加载列表

Question

我正在尝试在 python 3.9 中制作一个测验制作器和加载器，我想知道如何保存问题和答案列表。这样您就可以创建一个列表，然后将其保存到一个文件中并加载它来回答它。

    questions = [
        input("Enter question 1: "),
        input("Enter question 2: "),
        input("Enter question 3: "),
        input("Enter question 4: "),
        input("Enter question 5: "),
        input("Enter question 6: "),
        input("Enter question 7: "),
        input("Enter question 8: "),
        input("Enter question 9: "),
        input("Enter question 10: "),
    ]

Answer 1

鉴于您的用例，我认为使用 pickle 文件并不明智。相反，我建议将list 转换为string 并将其存储在一个简单的txt 文件中。以下是您可以如何做到的示例：

questions = [
        input("Enter question 1: "),
        input("Enter question 2: "),
        input("Enter question 3: "),
        input("Enter question 4: "),
        input("Enter question 5: "),
        input("Enter question 6: "),
        input("Enter question 7: "),
        input("Enter question 8: "),
        input("Enter question 9: "),
        input("Enter question 10: "),
    ]

with open('outfile.txt','w') as f:
    f.write('SEP'.join(questions)) #You can replace the SEP with a newline or say a pipe operator (|) or something similar
    
with open('outfile.txt') as f:
    print(f.read().split("SEP")) #Returns the list of questions as you have earlier

Answer 2

python 的pickle 库通常是一个不错的选择，但它是一种人类无法读取的文件格式。如果您想方便地在简单的文本编辑器中打开问题列表，我建议您将问题列表简单地保存为 txt 文件中的行。您已经知道如何获取用户输入列表，因此您只需遍历该字符串列表，并将它们写入文件。

#create a new txt file and open it in write mode
with open(r"C:\some\file\path.txt", "w") as f: #use a 'raw' string to handle windows file paths more easily
    for question in questions:
        f.write(question + "\n") #add a newline to the end of the question so each question is on it's own line in the text file

将文件读回到 python 中同样容易，但您可以花时间添加一些功能，例如忽略空白行，甚至可能包括应该忽略的 cmets 语法。

#open the file in read mode
questions = [] #create an empty list to read the questions into from the file
with open(r"C:\some\file\path.txt", "r") as f:
    for line in f:
        if line.strip(): #if we strip whitespace from the front and back of a line is there any text left
            if not line.strip().startswith("#"): #if the first non whitespace character is a '#', treat the line as a comment and skip it
                questions.append(line)