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calc.py
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calc.py
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from tkinter import *
import sys
#global variable
expression = ""
# Function to update expression
def press(num):
# point out the global expression variable
global expression
# concatenation of string
expression = expression + str(num)
equation.set(expression)
# equal to function
def equalto():
try:
global expression
total = str(eval(expression))
equation.set(total)
expression = ""
except:
equation.set(" error ")
expression = ""
# Function to clear the contents
# of text entry box
def clear():
global expression
expression = ""
equation.set("")
def exitSystem():
sys.exit()
# Driver code
if __name__ == "__main__":
# create a GUI window
gui = Tk()
# set the background colour of GUI window
gui.configure(background="light blue")
gui.title("Simple Calculator in Python")
gui.geometry("400x300")
equation = StringVar()
expression_field = Entry(gui, textvariable=equation, width = 30)
expression_field.grid(columnspan=5, ipadx=70, padx =9, pady = 9)
equation.set('')
button1 = Button(gui, text=' 1 ', fg='black', bg='blue',
command=lambda: press(1), height=1, width=7)
button1.grid(row=2, column=0)
button2 = Button(gui, text=' 2 ', fg='black', bg='blue',
command=lambda: press(2), height=1, width=7)
button2.grid(row=2, column=1)
button3 = Button(gui, text=' 3 ', fg='black', bg='blue',
command=lambda: press(3), height=1, width=7)
button3.grid(row=2, column=2)
button4 = Button(gui, text=' 4 ', fg='black', bg='blue',
command=lambda: press(4), height=1, width=7)
button4.grid(row=3, column=0)
button5 = Button(gui, text=' 5 ', fg='black', bg='blue',
command=lambda: press(5), height=1, width=7)
button5.grid(row=3, column=1)
button6 = Button(gui, text=' 6 ', fg='black', bg='blue',
command=lambda: press(6), height=1, width=7)
button6.grid(row=3, column=2)
button7 = Button(gui, text=' 7 ', fg='black', bg='blue',
command=lambda: press(7), height=1, width=7)
button7.grid(row=4, column=0)
button8 = Button(gui, text=' 8 ', fg='black', bg='blue',
command=lambda: press(8), height=1, width=7)
button8.grid(row=4, column=1)
button9 = Button(gui, text=' 9 ', fg='black', bg='blue',
command=lambda: press(9), height=1, width=7)
button9.grid(row=4, column=2)
button0 = Button(gui, text=' 0 ', fg='black', bg='blue',
command=lambda: press(0), height=1, width=7)
button0.grid(row=5, column=0)
plus = Button(gui, text=' + ', fg='black', bg='blue',
command=lambda: press("+"), height=1, width=7)
plus.grid(row=2, column=3)
minus = Button(gui, text=' - ', fg='black', bg='blue',
command=lambda: press("-"), height=1, width=7)
minus.grid(row=3, column=3)
multiply = Button(gui, text=' * ', fg='black', bg='blue',
command=lambda: press("*"), height=1, width=7)
multiply.grid(row=4, column=3)
divide = Button(gui, text=' / ', fg='black', bg='blue',
command=lambda: press("/"), height=1, width=7)
divide.grid(row=5, column=3)
equal = Button(gui, text=' = ', fg='black', bg='blue',
command=equalto, height=1, width=7)
equal.grid(row=5, column=2)
clear = Button(gui, text='Clear', fg='black', bg='blue',
command=clear, height=1, width=7)
clear.grid(row=5, column='1')
Decimal= Button(gui, text='.', fg='black', bg='blue',
command=lambda: press('.'), height=1, width=7)
Decimal.grid(row=6, column=0)
Exit= Button(gui, text='Exit', fg='black', bg='blue',
command=exitSystem, height=1, width=7)
Exit.grid(row=6, column= 1)
# start the GUI
gui.mainloop()