基于python的Tkinter实现一个简易计算器

#coding:utf-8from Tkinter import *import timeroot = Tk()def cacl(input_str):if "x" in input_str:ret = input_str.split("x")return int(ret[0]) * int(ret[1])def callback(n):print ndef callback1(n):print nclass App:def __init__(self, master):frame1 = Frame(master)frame1.pack()frame = Frame(master)frame.pack()Button(frame, text="1",command=lambda: callback(1) ).grid(row=0,column=0)Button(frame, text="2",command=lambda: callback(2) ).grid(row=0,column=1)Button(frame, text="3",command=lambda: callback(3) ).grid(row=0,column=2)Button(frame, text="4",command=lambda: callback(4) ).grid(row=1,column=0)Button(frame, text="5",command=lambda: callback(5) ).grid(row=1,column=1)Button(frame, text="6",command=lambda: callback(6) ).grid(row=1,column=2)Button(frame, text="7",command=lambda: callback(7) ).grid(row=2,column=0)Button(frame, text="8",command=lambda: callback(8) ).grid(row=2,column=1)Button(frame, text="9",command=lambda: callback(9) ).grid(row=2,column=2)Button(frame, text="0",command=lambda: callback(0) ).grid(row=3,column=0)Button(frame, text="+",command=lambda: callback1("+") ).grid(row=3,column=1)Button(frame, text="-",command=lambda: callback1("-") ).grid(row=3,column=2)Button(frame, text="*",command=lambda: callback1("*") ).grid(row=4,column=1)Button(frame, text="/",command=lambda: callback1("/") ).grid(row=4,column=2)Button(frame, text="=", command=self.say_hi).grid(row=4,column=0)w = Label(frame1,text="输入结果")w.pack()self.e = Entry(frame1)self.e.pack(padx=5)w1 = Label(frame1,text="计算结果")w1.pack()v = StringVar()e1 = Entry(frame1, textvariable=v)v.set("")self.v = ve1.pack()def say_hi(self):print "hi there, everyone!",self.e.get()input_str = self.e.get()self.v.set(cacl(input_str))app = App(root)root.mainloop()

from Tkinter import *  #创建横条型框架 def frame(root, side):  w = Frame(root)  w.pack(side = side, expand = YES, fill = BOTH)  return w #创建按钮 def button(root, side, text, command = None):  w = Button(root, text = text, command = command)  w.pack(side = side, expand = YES, fill = BOTH)  return w #继承了Frame类，初始化程序界面的布局 class Calculator(Frame):  def __init__(self):   Frame.__init__(self)   self.pack(expand = YES, fill = BOTH)  self.master.title('Simple Calculater')   display = StringVar()  #添加输入框  Entry(self, relief = SUNKEN,  textvariable = display).pack(side = TOP, expand = YES,    fill = BOTH)  #添加横条型框架以及里面的按钮  for key in('123', '456', '789', '-0.'):  keyF = frame(self, TOP)  for char in key:  button(keyF, LEFT, char, lambda w = display, c = char:w.set(w.get() + c))  #添加操作符按钮  opsF = frame(self, TOP)  for char in '+-*/=':  if char == '=':  btn = button(opsF, LEFT, char)  btn.bind('<ButtonRelease - 1>', lambda e, s = self, w = display:s.calc(w), '+')   else:  btn = button(opsF, LEFT, char, lambda w = display, s = '%s' %char:w.set(w.get() + s))  #添加清除按钮  clearF = frame(self, BOTTOM)  button(clearF, LEFT, 'clear', lambda w = display:w.set(''))   #调用eval函数计算表达式的值  def calc(self, display):  try:  display.set(eval(display.get()))  except:  display.set("ERROR") #程序的入口 if __name__ == '__main__':  print('ok')  Calculator().mainloop()