from __future__ import division
import Tkinter
from Tkinter import *
mygui = Tkinter.Tk()
mygui.title("Calculator")
l = Label(mygui, text="Answer: ")
l.place(relx=0.15, rely=0.2, anchor=CENTER)
e = Entry(mygui)
e.place(relx=0.4, rely=0.1, anchor=CENTER)
def Disp(nstr):
e.insert(END, nstr)
def Calc():
expr=e.get()
try:
b = Label(mygui, text=eval(expr))
b.place(relx=0.4, rely=0.2, anchor=CENTER)
except:
b = Label(mygui, text="Not computable")
b.place(relx=0.4, rely=0.2, anchor=CENTER)
def Erase():
e.delete(0,END)
x = 0.1
y = 0.4
for char in '123+456-789*0^./()':
b = Button(mygui, text=char,command=lambda n=char:Disp(n),
width=2, height=1)
b.place(relx=x, rely=y, anchor=CENTER)
x=x+0.1
if x==0.5:
x=0.1
y=y+0.1
b = Button(mygui, text="C",command=Erase, width=2, height=1)
b.place(relx=0.3, rely=0.8, anchor=CENTER)
b = Button(mygui, text="=",command=Calc, width=2, height=1)
b.place(relx=0.4, rely=0.8, anchor=CENTER)
mygui.mainloop()
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