imported>Unknown at 05:28, 7 February 2021

2021-02-07T05:28:15Z

New page

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('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, 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.calc(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 calc(self, display):
try:
display.set(repr(eval(display.get())))
except ValueError:
display.set("Error")

if __name__ == '__main__':
calculator().mainloop();

TkinterProgramming/SimpleCalculator - Revision history

imported>Unknown at 05:28, 7 February 2021