用python写的一个简单的计算器

http://blog.csdn.net/qqyyhh/archive/2007/04/12/1562523.aspx

 

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()