Question

所以我正在为一个非常基本的音乐应用程序开发代码，每个用户信息都使用以下格式保存到数据库中：

usrFile_write.write(username + ' : ' + password + ' : ' + name + ' : ' + dob + ' : ' + fav_artist + ' : ' + fav_genre + ' : ' + '\n' )

现在我想阅读特定用户的现有信息，并允许他们更改他们的fav_genre。以下是我尝试失败的尝试：

textfile = 'user_DB.txt'
def a():
    username = input('name?: ')
    with open(textfile, 'r+') as textIn:
        for line in textIn:
            information = line.split(" : ")
            if information[0] == username:
                print('Your current genre is:',information[5])
                new_genre = input('what would you like your new genre to be?')
                information[5] = new_genre
                textIn.write(information[5]=new_genre)#this line
                print('new genre is saved to',information[5])
                break
            elif information != username:
                print('Name not found, Please try again')
                a()
            else:print('invalid')
            break
    textIn.close()

a()

注释#this行的行是我认为错误正在出现的地方，因为我想用新的那个覆盖该特定用户的fav_genre的先前值。关于我可以做什么不同的任何想法使这项工作？

Answer 1

基本上将该行更改为：

textfile.write(' : '.join(information.values()) + '\n' )

如此完整的代码：

textfile = 'user_DB.txt'
updated_textfile = 'user_DB_Updated.txt'
def a():
    username = input('name?: ')
    updated_lines = []
    with open(textfile, 'r+') as textIn:
        for line in textIn:
            information = line.split(" : ")
            updated_lines.append(line)
            if information[0] == username:
                print('Your current genre is:',information[5])
                new_genre = input('what would you like your new genre to be?')
                information[5] = new_genre
                updated_lines[-1] = ' : '.join(information) + '\n' 
                print('new genre is saved to ',information[5])
                break
            elif information != username:
                print('Name not found, Please try again')
                a()
            else:print('invalid')
            break
    with open(updated_textfile, 'w+') as out_text:
        out_text.write(''.join(updated_lines))
    textfile.close()

a()

如何在此代码中覆盖用户的fav_genre

1 个答案: