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用Python完成的一个简单的计算器，能算简单的＋，-，×，/运算，暂不支持键盘输入，以后会慢慢加些附加的功能，让它变得强大些

from Tkinter import *

def frame(root,side):
?w=Frame(root)
?w.pack(side=side,expand=YES,fill=BOTH)
?return w

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

class Calculator(Frame):
?def __init__(self):
? Frame.__init__(self)
? self.pack(expand=YES,fill=BOTH)
? self.master.title("Simple Calculator")
? self.master.iconname("calcl")
?
? display=StringVar()
? Entry(self,relief=SUNKEN,textvariable=display).pack(side=TOP,
??? expand=YES,fill=BOTH)
?
? for key in ("123","456","789","-0."):
?? deyF=frame(self,TOP)
?? for char in key:
??? button(deyF,LEFT,char,lambda w=display,s="%s"%char: w.set\
????? (w.get()+s))
?
? 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.clac(w),'+')
?? else:
??? btn=button(opsF,LEFT,char,lambda w=display,c=char: w.set\
????? (w.get()+' '+c+' '))
?
? clearF=frame(self,BOTTOM)
? button(clearF,LEFT,'Clr',lambda w=display: w.set(' '))
?
?def clac(self,display):
? try:
?? display.set(eval(display.get()))
? except SyntaxError:
?? display.set("ERROR")
? except ZeroDivisionError:
?? display.set("ZeroDivisionError")

if __name__=="__main__":
?Calculator().mainloop()