我无法在Python中更改tkinter画布的背景

Question

尽管使用了 config() 方法，我的画布的背景颜色不会改变。我已经通过使用一些打印语句来确保 if 语句是正确的，我已经做了一些研究，这是更改现有画布颜色的唯一方法 -

此外，在浏览了一些旧问题后，造成这种情况的潜在原因之一是每次迭代后都会创建一个新的画布，并且由于我已经在 innit() 方法中定义了卡瓦，所以这不是案例。

那么我到底应该做什么？

QuizBrain 课程-

import html


class QuizBrain:

def __init__(self, q_list):
    self.question_number = 0
    self.score = 0
    self.question_list = q_list
    self.current_question = None

def still_has_questions(self):
    return self.question_number < len(self.question_list)

def next_question(self):
    self.current_question = self.question_list[self.question_number]
    self.question_number += 1
    q_text = html.unescape(self.current_question.text)
    return f"Q.{self.question_number}: {q_text}"

def check_answer(self, user_answer):
    correct_answer = self.current_question.answer
    if user_answer.lower() == correct_answer.lower():
        self.score += 1
        return True
    else:
        return False

QuizInterface 类 - 查看

def give_feedback(self, is_right: bool)

方法，它负责更改画布背景，告诉用户他们是否答对了（绿色）或错了（红色）。我还分享了其他类（上面和下面）以了解上下文，以防问题出现。

from tkinter import *
from quiz_brain import QuizBrain
THEME_COLOR = "#375362"


class QuizInterface:

def __init__(self, quiz_brain: QuizBrain):
    self.quiz = quiz_brain

    self.window = Tk()
    self.window.config(background=THEME_COLOR, padx=20, pady=20)
    self.window.title("Quiz")

    self.score_label = Label(text="score: 0", font=("Arial", 20, "italic"), padx=20, pady=20, bg=THEME_COLOR,
                             fg="white")
    self.score_label.grid(row=0, column=1)

    self.canvas = Canvas(width=300, height=250, background="white")
    self.question_text = self.canvas.create_text(150, 125, text="SAMPLE",
                                                 font=("Arial", 20, "italic"), fill="black", width=250)
    self.canvas.grid(column=0, row=1, columnspan=2, pady=40)

    true_image = PhotoImage(file="images/true.png")
    false_image = PhotoImage(file="images/false.png")

    self.true_button = Button(image=true_image, command=self.true_pressed)
    self.true_button.grid(row=2, column=0)

    self.false_button = Button(image=false_image, command=self.false_pressed)
    self.false_button.grid(row=2, column=1)

    self.get_next_question()

    self.window.mainloop()

def get_next_question(self):
    question_text = self.quiz.next_question()
    self.canvas.itemconfig(self.question_text, text=question_text)

def true_pressed(self):
    is_right = self.quiz.check_answer("True")
    self.give_feedback(is_right)

def false_pressed(self):
    is_right = self.quiz.check_answer("False")
    self.give_feedback(is_right)

def give_feedback(self, is_right: bool):
    print("Called")
    if is_right:
        print("Called-2")
        self.canvas.configure(bg="green")
        print("Executed")
    elif not is_right:
        print("called-3")
        self.canvas.configure(bg="red")
        print("Executed")

    self.window.after(3000, self.get_next_question)
    self.canvas.config(background="white")

问题类-

class Question:

def __init__(self, q_text, q_answer):
    self.text = q_text
    self.answer = q_answer

我如何得到我的问题-

import requests

parameters = {
    "amount": 10,
    "type": "boolean"
}

quiz_data = requests.get(url="https://opentdb.com/api.php", params=parameters)

quiz_data.raise_for_status()
quiz_questions = quiz_data.json()

question_data = quiz_questions["results"]

主要.py-

from question_model import Question
from data import question_data
from quiz_brain import QuizBrain
from ui import QuizInterface

question_bank = []
for question in question_data:
    question_text = question["question"]
    question_answer = question["correct_answer"]
    new_question = Question(question_text, question_answer)
    question_bank.append(new_question)


quiz = QuizBrain(question_bank)
quiz_interface = QuizInterface(quiz)

#
# while quiz.still_has_questions():
#     quiz.next_question()
#
# print("You've completed the quiz")
# print(f"Your final score was: {quiz.score}/{quiz.question_number}")

Answer 1

移动线路

self.canvas.config(background="white")

从 Give_feedback 函数到 get_next_question 函数。

Answer 2

我认为我们正在做同样的课程，我在这部分遇到了同样的问题。您只需更新屏幕即可：

def give_feedback(self, is_right: bool):
if is_right:
    self.canvas.configure(bg="green")
elif not is_right:
    self.canvas.configure(bg="red")
self.canvas.update()
self.window.after(3000, self.get_next_question)
self.canvas.config(background="white")