顺便学习下Python桌面应用程序写法

import tkinter as tk


class Calculator:
    def __init__(self, root):
        self.root = root
        self.root.title("Calculator")

        # 创建输入框
        self.display = tk.Entry(root, width=30, font=('Arial', 16), borderwidth=5, justify='right')
        self.display.grid(row=0, column=0, columnspan=4, padx=10, pady=10)

        # 创建按钮
        self.create_button('7', 1, 0)
        self.create_button('8', 1, 1)
        self.create_button('9', 1, 2)
        self.create_button('/', 1, 3)
        self.create_button('4', 2, 0)
        self.create_button('5', 2, 1)
        self.create_button('6', 2, 2)
        self.create_button('*', 2, 3)
        self.create_button('1', 3, 0)
        self.create_button('2', 3, 1)
        self.create_button('3', 3, 2)
        self.create_button('-', 3, 3)
        self.create_button('0', 4, 0)
        self.create_button('.', 4, 1)
        self.create_button('AC', 4, 2)
        self.create_button('+', 4, 3)
        self.create_button('=', 5, 0, columnspan=4)

    def create_button(self, text, row, column, columnspan=1, padx=10, pady=10):
        button = tk.Button(self.root, text=text, padx=padx, pady=pady, font=('Arial', 16),
                           command=lambda: self.button_click(text))
        button.grid(row=row, column=column, columnspan=columnspan, padx=padx, pady=pady)

    def button_click(self, text):
        if text == 'AC':
            self.display.delete(0, tk.END)
        elif text == '=':
            try:
                result = eval(self.display.get())
                self.display.delete(0, tk.END)
                self.display.insert(0, result)
            except:
                self.display.delete(0, tk.END)
                self.display.insert(0, 'Error')
        else:
            self.display.insert(tk.END, text)





if __name__ == '__main__':
    root = tk.Tk()
    app = Calculator(root)
    root.mainloop()