python 简易计算器

mm111222

#-*- coding:UTF-8-*-
#Simple Cal
#######################
from Tkinter import *
def frame(root, side):
w = Frame(root)
w.pack(side=side, expand=YES, fill=BOTH)
return w
#end of def
def button(root, side, text, command=None):
w = Button(root, text=text, command=command)
w.pack(side=side, expand=YES, fill=BOTH)
return w
#end of def
class Calculator(Frame):
def __init__(self):
Frame.__init__(self)
#self.oprion_add('*Font', 'Verdana 12 bold')
self.option_add('*Font', 'Verdana 12 bold')
self.pack(expand=YES, fill=BOTH)
self.master.title('Simple Cal')
self.master.iconname('calc1')
display = StringVar()
Entry(self, relief=SUNKEN, textvariable=display).pack(side=TOP, expand=YES, fill=BOTH)
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))
#end of for
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))
#end of if
#end of for
clearF = frame(self, BOTTOM)
button(clearF, LEFT, 'Clr', lambda w=display: w.set(''))
#end of def
def calc(self, display):
try:
display.set(eval(display.get()))
except:
display.set('ERROR')
#end of try and except
#end of def
#end of class
if __name__ == '__main__':
Calculator().mainloop()