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A calculator that is easy to make/develop.

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.option_add('*Font', 'Verdana 12 bold')
self.pack(expand=YES, fill=BOTH)
self.master.title('Simple Calculator')
self.master.iconname("calc1" wink

display = StringVar()
Entry(self, relief=SUNKEN,
textvariable=display).pack(side=TOP, expand=YES,
fill=BOTH)

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

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))

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

def calc(self, display):
try:
display.set('eval(display.get() wink ')
except:
display.set("ERROR" wink

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