基于python的Tkinter实现一个简易计算器

 #coding:utf-8 from Tkinter import * import time root = 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 n def callback1(n): print n class 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 = v e1.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<b style="color:transparent">来源gao@!dai!ma.com搞$$代^@码网</b>(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('', 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()