为什么我的测验应用程序代码无法正确重置？

我正在尝试编写一个基本的测验应用程序。由于某种原因，当我前后移动时，小测验不会像我想象的那样重置。例如，如果我正在测验中途，如果我决定向前点击箭头然后再次返回，我的进度应该被重置。我有两个脚本，我向您展示一个是我的 main.py，另一个是 quizzes.py。还有我用于测验的 csv 文件的摘录。

问题、答案 爆炸，爆炸 姓氏，埃尔阿佩利多 会议, 会议 强度,la intensidad 包裹，el paquete 该提案，la propuesta 瓶子，拉博特拉 尸体，el cadaver 组合, 组合 那位女士，拉达玛 涟漪，拉昂达 塔，拉托雷 渴望，el afán 委员会 等等等等 不便, el inconveniente 水龙头，拉拉夫 占有, 姿势 候选人, el Candidato 煤气，煤气

import ttkbootstrap as tb
from quizzes import Quizzes


# main.py


class App(tb.Window):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, themename='superhero', **kwargs)
        self.title('App')
        self.geometry('400x300')

        container = tb.Frame(self)
        container.pack(side="top", fill="both", expand=True)

        self.frames = {}
        for F in (Quizzes):
            page_name = F.__name__
            frame = F(parent=container, controller=self)
            self.frames[page_name] = frame

            frame.pack(anchor='center')


if __name__ == "__main__":
    app = App()
    app.mainloop()

import itertools
import pandas as pd
import ttkbootstrap as tb
from PIL import Image
Image.CUBIC = Image.BICUBIC


# quizzes.py


class Quizzes(tb.Frame):
    def __init__(self, parent, controller):
        super().__init__(parent)
        self.controller = controller
        self.parent = parent

        self.question_length = 5

        # add meter
        self.quiz_meter = tb.Meter(self, amounttotal=self.question_length, textright='of',
                              subtext=f'{self.question_length} correct answers')
        self.quiz_meter.pack(anchor='center', pady=10)

        # add question label
        self.quiz_question = tb.Label(self, text='Question', font=('Helvetica', 22))
        self.quiz_question.pack(anchor='center', pady=10)

        # entry
        self.quiz_entry = tb.Entry(self, font=('Helvetica', 25), justify='center')
        self.quiz_entry.pack(anchor='center', pady=10)
        self.quiz_entry.bind('<Return>', self.enter_answer)

        # Quiz number label
        self.quiz_number = tb.Label(self, text=1, font=('Helvetica', 18))
        self.quiz_number.pack(anchor='center', pady=10)

        # establish button style
        self.btn_style = tb.Style()
        self.btn_style.configure('outline.TButton', font=('Helvetica', 18))

        # back button
        self.back_btn = tb.Button(self, text='<', command=self.back, style='outline.TButton')
        self.back_btn.pack(side='left', pady=10)

        # forward button
        self.forward_btn = tb.Button(self, text='>', command=self.forward, style='outline.TButton')
        self.forward_btn.pack(side='right', pady=10)

        # Main menu button
        self.main_menu_btn = tb.Button(self, text='Main Menu', command=self.main_menu, style='outline.TButton')
        self.main_menu_btn.pack(anchor='center', pady=10)

        # df
        self.df = pd.read_csv('csv files\\1000 Spanish Nouns.csv')

        # separate df into multiple parts
        self.quizzes = []
        for i in range(0, len(self.df), self.question_length):
            if i + self.question_length < len(self.df) + 1:
                dataframe = self.df.iloc[i:i + self.question_length]
                lst = [tuple(row) for row in dataframe.itertuples(index=False, name=None)]
                self.quizzes.append(lst)
            else:
                dataframe = self.df.iloc[i:]
                lst = [tuple(row) for row in dataframe.itertuples(index=False, name=None)]
                self.quizzes.append(lst)

        # establish first quiz to test on
        self.quiz_index = 0
        self.current_quiz = self.quizzes[self.quiz_index]

        # quiz cycle
        self.quiz_cycle = itertools.cycle(self.current_quiz)

        # Setup first question
        self.row = next(self.quiz_cycle)
        self.question = self.row[0]
        self.answer = self.row[1]

        self.quiz_question.config(text=self.question)

    def back(self):
        # Reset meter
        self.quiz_meter.configure(amountused=0)

        # enable entry
        self.quiz_entry.config(state='normal')

        # Set next quiz
        if self.quiz_index != 0:
            self.quiz_index -= 1
            self.current_quiz = self.quizzes[self.quiz_index]
            self.quiz_cycle = itertools.cycle(self.current_quiz)
        else:
            self.current_quiz = self.quizzes[self.quiz_index]
            self.quiz_cycle = itertools.cycle(self.current_quiz)

        # Load first question
        self.row = next(self.quiz_cycle)
        self.question = self.row[0]
        self.answer = self.row[1]

        self.quiz_question.config(text=self.question)

        # Set new quiz number
        self.quiz_number.config(text=self.quiz_index + 1)

    def forward(self):
        # Reset meter
        self.quiz_meter.configure(amountused=0)

        # enable entry
        self.quiz_entry.config(state='normal')

        # Set next quiz
        if self.quiz_index != len(self.quizzes) - 1:
            self.quiz_index += 1
            self.current_quiz = self.quizzes[self.quiz_index]
            self.quiz_cycle = itertools.cycle(self.current_quiz)
        else:
            self.current_quiz = self.quizzes[self.quiz_index]
            self.quiz_cycle = itertools.cycle(self.current_quiz)

        # Load first question
        self.row = next(self.quiz_cycle)
        self.question = self.row[0]
        self.answer = self.row[1]

        self.quiz_question.config(text=self.question)

        # Set new quiz number
        self.quiz_number.config(text=self.quiz_index + 1)

        print(self.current_quiz)

    def main_menu(self):
        pass

    def enter_answer(self, event):
        # Check answer
        if self.quiz_entry.get() == self.answer:
            self.quiz_meter.configure(bootstyle='success')
            self.parent.after(400, self.reset_meter)
            self.quiz_meter.configure(amountused=self.quiz_meter.amountusedvar.get() + 1)

            # if last question is correct disable quiz
            if self.quiz_meter.amountusedvar.get() == self.question_length:
                self.quiz_question.config(text='Completed!')
                self.quiz_entry.delete(0, tb.END)
                self.quiz_entry.config(state='disabled')
                return

            self.current_quiz.remove(self.row)
            self.quiz_cycle = itertools.cycle(self.current_quiz)
            self.parent.after(400, self.next_question)
        else:
            self.quiz_meter.configure(bootstyle='danger')
            self.parent.after(2000, self.reset_meter)
            self.quiz_question.config(text=self.answer)
            self.parent.after(2000, self.next_question)

    def next_question(self):

        # Clear entry
        self.quiz_entry.delete(0, tb.END)

        # next question
        self.row = next(self.quiz_cycle)
        self.question = self.row[0]
        self.answer = self.row[1]

        self.quiz_question.config(text=self.question)

    def reset_meter(self):
        self.quiz_meter.configure(bootstyle="info")

代码中导致测验重置问题的原因是 forward 和 back 函数的逻辑。问题在于，当使用 itertools.cycle 创建 self.quiz_cycle 时，正在创建一个迭代器，该迭代器在迭代完当前测验后循环回到测验的开头。这意味着，当前进或后退到新测验，然后又返回时， self.quiz_cycle 迭代器将从上一次停止的位置继续，而不是从测验的开头重新开始。

要解决此问题，需要在每次切换测验时重新创建 self.quiz_cycle 迭代器。可以通过将 self.quiz_cycle = itertools.cycle(self.current_quiz) 行移到 forward 和 back 函数的调用 next(self.quiz_cycle) 之前来实现。

以下是更新后的 forward 和 back 函数：

    def back(self):
        # Reset meter
        self.quiz_meter.configure(amountused=0)

        # enable entry
        self.quiz_entry.config(state='normal')

        # Set next quiz
        if self.quiz_index != 0:
            self.quiz_index -= 1
            self.current_quiz = self.quizzes[self.quiz_index]
        else:
            self.current_quiz = self.quizzes[self.quiz_index]

        # Reset quiz cycle
        self.quiz_cycle = itertools.cycle(self.current_quiz)

        # Load first question
        self.row = next(self.quiz_cycle)
        self.question = self.row[0]
        self.answer = self.row[1]

        self.quiz_question.config(text=self.question)

        # Set new quiz number
        self.quiz_number.config(text=self.quiz_index + 1)

    def forward(self):
        # Reset meter
        self.quiz_meter.configure(amountused=0)

        # enable entry
        self.quiz_entry.config(state='normal')

        # Set next quiz
        if self.quiz_index != len(self.quizzes) - 1:
            self.quiz_index += 1
            self.current_quiz = self.quizzes[self.quiz_index]
        else:
            self.current_quiz = self.quizzes[self.quiz_index]

        # Reset quiz cycle
        self.quiz_cycle = itertools.cycle(self.current_quiz)

        # Load first question
        self.row = next(self.quiz_cycle)
        self.question = self.row[0]
        self.answer = self.row[1]

        self.quiz_question.config(text=self.question)

        # Set new quiz number
        self.quiz_number.config(text=self.quiz_index + 1)

        print(self.current_quiz)

通过进行此更改，每次切换测验时，都会创建一个新的 self.quiz_cycle 迭代器，该迭代器从测验的开头开始，从而确保测验按预期重置。