Tkinter 是 Python 的标准 GUI 库。Python 使用 Tkinter 可以快速的创建 GUI 应用程序。我们可以用它来实现一个简易计算器。
直接上代码：
# encoding=utf-8
from tkinter import *class Calculator:def __init__(self, pwindow):self.pwindow = pwindowself.num1 = 0self.num2 = 0self.sign = None # 运算符号self.if_equal = None # 判断输入显示之前是否已进行过运算self.init_pwindow()def init_pwindow(self):"""父窗口相关配置"""self.pwindow.title('计算器') # 窗口名self.pwindow.geometry('200x300+10+10') # 设置窗口的大小以及在屏幕上的位置# 设置按钮self.button_1 = Button(self.pwindow, text=1, width=5, command=lambda: self.show_num(1))self.button_1.grid(row=1, column=0)self.button_2 = Button(self.pwindow, text=2, width=5, command=lambda: self.show_num(2))self.button_2.grid(row=1, column=1)self.button_3 = Button(self.pwindow, text=3, width=5, command=lambda: self.show_num(3))self.button_3.grid(row=1, column=2)self.button_4 = Button(self.pwindow, text=4, width=5, command=lambda: self.show_num(4))self.button_4.grid(row=2, column=0)self.button_5 = Button(self.pwindow, text=5, width=5, command=lambda: self.show_num(5))self.button_5.grid(row=2, column=1)self.button_6 = Button(self.pwindow, text=6, width=5, command=lambda: self.show_num(6))self.button_6.grid(row=2, column=2)self.button_7 = Button(self.pwindow, text=7, width=5, command=lambda: self.show_num(7))self.button_7.grid(row=3, column=0)self.button_8 = Button(self.pwindow, text=8, width=5, command=lambda: self.show_num(8))self.button_8.grid(row=3, column=1)self.button_9 = Button(self.pwindow, text=9, width=5, command=lambda: self.show_num(9))self.button_9.grid(row=3, column=2)self.button_0 = Button(self.pwindow, text=0, width=5, command=lambda: self.show_num(0))self.button_0.grid(row=4, column=2)self.button_add = Button(self.pwindow, text='+', width=5, command=lambda: self.sign_num('+'))self.button_add.grid(row=4, column=0)self.button_add = Button(self.pwindow, text='-', width=5, command=lambda: self.sign_num('-'))self.button_add.grid(row=4, column=1)self.button_add = Button(self.pwindow, text='*', width=5, command=lambda: self.sign_num('*'))self.button_add.grid(row=5, column=0)self.button_add = Button(self.pwindow, text='/', width=5, command=lambda: self.sign_num('/'))self.button_add.grid(row=5, column=1)self.button_equal = Button(self.pwindow, text='=', width=5, command=self.equal_num)self.button_equal.grid(row=5, column=2)# 设置文本显示框self.text_1 = Text(self.pwindow, width=18, height=3)self.text_1.grid(row=0, column=0, columnspan=3)def show_num(self, num):"""显示数字到显示框"""if self.if_equal:self.text_1.delete(1.0, END)self.if_equal = Falseself.text_1.insert(2.0, num)def sign_num(self, sign):"""运算符号"""self.sign = signself.num1 = self.text_1.get(1.0, END)self.text_1.delete(1.0, END) # 清空显示框def equal_num(self):"""等于号"""self.if_equal = Trueself.num2 = self.text_1.get(1.0, END)self.text_1.delete(1.0, END)count = 0if self.sign == '+':count = float(self.num1) + float(self.num2)elif self.sign == '-':count = float(self.num1) - float(self.num2)elif self.sign == '*':count = float(self.num1) * float(self.num2)else:count = float(self.num1) / float(self.num2)self.text_1.insert(1.0, count)if __name__ == '__main__':parent_window = Tk()c = Calculator(parent_window)parent_window.mainloop()
该计算器真的很简易，还有很多可以优化的地方。