Tkinter数字猜谜游戏：错误猜测时计数器无法持续递减求助

问题描述 #

开发基于CustomTkinter的数字猜谜游戏时，期望每次猜错数字时计数器递减，但目前仅首次猜错时计数器减1，后续不再变化。原代码如下：

import random
import customtkinter as ctk
import tkinter


root = ctk.CTk()
ctk.set_appearance_mode('dark')
ctk.set_default_color_theme("dark-blue")
root.geometry('800x800')
root.title('Name Guessing Game')

random_number = random.randint(1, 100)
global counter
counter = 8
n_var = tkinter.StringVar(root, value='hint')


def low():
    print('Higher')


def high():
    print('Lower')

def won():
    print('You Guessed Correctly!!!!')


def submit(counter, chances_counter):
    
    global number
    number = 0

    while number != random_number and counter != 0:
        number = int(number_guess.get())
        if number < random_number:
            n_var.set(value='Too low go higher')
            counter -= 1
            chances_counter.configure(text=counter)
            return low()

        elif number > random_number:
            n_var.set(value='Too high go lower')
            counter -= 1
            chances_counter.configure(text=counter)
            return high()

        else:
            n_var.set(value='')
            return won()
            break

#GUI


frame_title = ctk.CTkFrame(master=root, corner_radius=20)
frame_title.pack(pady=(20, 20), padx=20, fill='x')

frame_guess = ctk.CTkFrame(master=root, corner_radius=20)
frame_guess.pack(side='top', ipady=80, fill='x', padx=20)

frame_hint = ctk.CTkFrame(master=root, corner_radius=20)
frame_hint.pack(side='top', ipady=80, fill='x', padx=20, pady=(20, 10))

frame_answer = ctk.CTkFrame(master=root, corner_radius=20)
frame_answer.pack(side='top', ipady=80, fill='x', padx=20, pady=(10, 10))

title_block = ctk.CTkLabel(master=frame_title, text='Number Guessing Game!', font=ctk.CTkFont(size=30))
title_block.pack(pady=80)

# guess input
number_guess = ctk.CTkEntry(master=frame_guess, placeholder_text='number to guess')
number_guess.pack(side='left', padx=20)

# guess submit
button = ctk.CTkButton(master=frame_guess, text='submit', command=lambda:[submit(counter, chances_counter), answer_a()])
button.pack(side='left')

#chances left


chances_counter = ctk.CTkLabel(master=frame_guess, text=counter, font=ctk.CTkFont(size=18))
chances_counter.pack(side='right', padx=20)

chances_counter1 = ctk.CTkLabel(master=frame_guess, text='How many chances left:', font=ctk.CTkFont(size=16))
chances_counter1.pack(side='right')

#hint


hint_lower = ctk.CTkLabel(master=frame_hint, textvariable=n_var, font=ctk.CTkFont(size=16))
hint_lower.pack(side='left',fill='both', expand=True, padx=20)


#answer
a_var = tkinter.StringVar(root, value='')
def answer_a():
    if number == random_number:
        a_var.set(value='Congratultions you guessed right!!!')
    


hint_answer = ctk.CTkLabel(master=frame_answer, textvariable=a_var, font=ctk.CTkFont(size=16))
hint_answer.pack(side='left',fill='both', expand=True, padx=20)


root.mainloop()

问题分析 #

1. 参数传递错误：submit函数将counter作为参数传入，属于值传递，函数内修改的是局部变量，不会影响全局的counter。每次点击按钮都会传入全局初始值8，导致计数器始终停在7。
2. 不必要的while循环：Tkinter是事件驱动模型，每次点击按钮触发一次submit执行，while循环会打乱逻辑，仅需单次判断即可。
3. 全局变量声明逻辑错误：要在函数内修改全局变量，需在函数内部声明global counter，而非全局作用域开头。

修复后的代码 #

import random
import customtkinter as ctk
import tkinter


root = ctk.CTk()
ctk.set_appearance_mode('dark')
ctk.set_default_color_theme("dark-blue")
root.geometry('800x800')
root.title('Number Guessing Game')

random_number = random.randint(1, 100)
counter = 8
n_var = tkinter.StringVar(root, value='hint')
number = 0  # 全局变量统一声明


def low():
    print('Higher')


def high():
    print('Lower')

def won():
    print('You Guessed Correctly!!!!')


def submit(chances_counter):
    global counter, number
    
    # 判断剩余机会
    if counter <= 0:
        n_var.set(value='No chances left!')
        return
    
    # 处理非数字输入
    try:
        number = int(number_guess.get())
    except ValueError:
        n_var.set(value='Please enter a valid number!')
        return
    
    if number < random_number:
        n_var.set(value='Too low go higher')
        counter -= 1
        chances_counter.configure(text=counter)
        low()
    elif number > random_number:
        n_var.set(value='Too high go lower')
        counter -= 1
        chances_counter.configure(text=counter)
        high()
    else:
        n_var.set(value='')
        won()
        a_var.set(value='Congratulations you guessed right!!!')


# GUI部分
frame_title = ctk.CTkFrame(master=root, corner_radius=20)
frame_title.pack(pady=(20, 20), padx=20, fill='x')

frame_guess = ctk.CTkFrame(master=root, corner_radius=20)
frame_guess.pack(side='top', ipady=80, fill='x', padx=20)

frame_hint = ctk.CTkFrame(master=root, corner_radius=20)
frame_hint.pack(side='top', ipady=80, fill='x', padx=20, pady=(20, 10))

frame_answer = ctk.CTkFrame(master=root, corner_radius=20)
frame_answer.pack(side='top', ipady=80, fill='x', padx=20, pady=(10, 10))

title_block = ctk.CTkLabel(master=frame_title, text='Number Guessing Game!', font=ctk.CTkFont(size=30))
title_block.pack(pady=80)

# 猜数字输入框
number_guess = ctk.CTkEntry(master=frame_guess, placeholder_text='number to guess')
number_guess.pack(side='left', padx=20)

# 提交按钮，移除counter参数
button = ctk.CTkButton(master=frame_guess, text='submit', command=lambda: submit(chances_counter))
button.pack(side='left')

# 剩余机会显示
chances_counter = ctk.CTkLabel(master=frame_guess, text=counter, font=ctk.CTkFont(size=18))
chances_counter.pack(side='right', padx=20)

chances_counter1 = ctk.CTkLabel(master=frame_guess, text='How many chances left:', font=ctk.CTkFont(size=16))
chances_counter1.pack(side='right')

# 提示信息
hint_lower = ctk.CTkLabel(master=frame_hint, textvariable=n_var, font=ctk.CTkFont(size=16))
hint_lower.pack(side='left',fill='both', expand=True, padx=20)

# 结果信息
a_var = tkinter.StringVar(root, value='')
hint_answer = ctk.CTkLabel(master=frame_answer, textvariable=a_var, font=ctk.CTkFont(size=16))
hint_answer.pack(side='left',fill='both', expand=True, padx=20)


root.mainloop()

关键修改点 #

• 移除submit函数的counter参数，在函数内部通过global counter声明使用全局变量，确保修改的是全局计数器。
• 删除不必要的while循环，改为单次判断，符合Tkinter事件驱动逻辑。
• 将answer_a函数的逻辑合并到submit的正确分支中，简化调用流程。
• 添加输入合法性判断，避免非数字输入导致报错。
• 增加剩余机会耗尽的提示逻辑。

内容的提问来源于stack exchange，提问作者JustTrying