Question

我正在尝试基于tkinter构建计算器。我还将遵循there中的提示。确定程序仍在进行中。由于这个错误，我目前陷入困境：

AttributeError：“ Calculator_GUI”对象没有属性“ main”

我不知道如何在两个班级之间进行沟通。我还要求对已经完成的工作进行简短回顾。提前致谢！这是代码：

import tkinter as tk
from tkinter import ttk

class Calculator_Core():
    def __init__(self):
        self.input = tk.StringVar()

    def buttonClick(self, a):
        self.input.set(a)
        #DEBUG:
        print(self.input)


class Calculator_GUI(tk.Frame):
    def __init__(self, master):
        tk.Frame.__init__(self, master)
        self.master = master
        self.button = {}
        self.configure_gui()
        self.create_widgets()
        self.main = Calculator_Core()

    def configure_gui(self):
        self.master.title("Calculator")
        self.master.resizable(False, False)

    def create_widgets(self):
        self.configure_input_space()
        row_number = 1
        column_number = 0
        a = -1
        text_buttons = ('789+', '456-', '123*', '0=/C')
        for button_row in text_buttons:
            for text_button in button_row:
                a += 1
                self.configure_button(text_button, row_number, column_number, a)
                column_number += 1
            row_number += 1
            column_number = 0

    def configure_button(self, text, row, column, key):
        self.button[key] = ttk.Button(self.master, text=text,
                                  command=lambda: self.main.buttonClick(text))
        self.button[key].grid(row=row, column=column)

    def configure_input_space(self):
        self.entry = ttk.Entry(self.master, textvariable=self.main.input)
        self.entry.grid(columnspan=4, sticky='we')


if __name__ == "__main__":
    root = tk.Tk()
    Calculator_GUI(root)
    root.mainloop()

Answer 1

在运行self.main功能之前，您需要先“制作” create_widgets()，这样：

class Calculator_GUI(tk.Frame):
    def __init__(self, master):
        tk.Frame.__init__(self, master)
        self.master = master
        self.button = {}
        self.configure_gui()
        self.create_widgets()
        self.main = Calculator_Core()

应该是这样的：

class Calculator_GUI(tk.Frame):
    def __init__(self, master):
        tk.Frame.__init__(self, master)
        self.master = master
        self.main = Calculator_Core()
        self.button = {}
        self.configure_gui()
        self.create_widgets()

因为create_widgets()函数运行引用了configure_button()的{{1}}和configure_input_space()函数。

在Python中的类之间进行通信

1 个答案: