python 计算器

#!/usr/bin/python2.6
# -*- coding: utf-8 -*-

from Tkinter import *

#root = Tk()
# 80x80代表了初始化时主窗口的大小，0，0代表了初始化时窗口所在的位置
#root.geometry('800x600+10+10')
#root.mainloop()

class yyCalcutor(Frame):

def __init__(self):
Frame.__init__(self)
self.pack(expand = YES, fill = BOTH)
self.master.title('Simple Calculater')
display = StringVar()
Entry(self, relief = SUNKEN,textvariable = display).pack(side = TOP, expand = YES,fill = BOTH)
#当expand选项为”yes”时，填充父组件的剩余空间

for key in('123', '456', '789', '-0.'):
keyF = self.frame(self, TOP)
for char in key:
self.button(keyF, LEFT, char, lambda w = display, c = char:w.set(w.get() + c))

opsF = self.frame(self, TOP)
for char in '+-*/=':
if char == '=':
btn = self.button(opsF, LEFT, char)
print btn
btn.bind('<ButtonRelease - 1>', lambda e, s = self, w = display:s.calc(w), '+')

else:
btn = self.button(opsF, LEFT, char, lambda w = display, s = '%s' %char:w.set(w.get() + s))

clearF = self.frame(self, BOTTOM)
self.button(clearF, LEFT, 'clear', lambda w = display:w.set(''))

def button(self,root, side, text, command = None):
w = Button(root, text = text, command = command)
w.pack(side = side, expand = YES, fill = BOTH)
#return w

def frame(self,root, side):
w = Frame(root)
w.pack(side = side, expand = YES, fill = BOTH)
return w
#假如你有一个类称为MyClass和这个类的一个实例MyObject。当你调用这个对象的方法MyObject.method(arg1, arg2)的时候，这会由Python自动转为MyClass.method(MyObject, arg1,arg2)——这就是self的原理了

if __name__=='__main__':
yyCalcutor().mainloop()