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calculator.py
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from tkinter import *
expression = ""
def press(num):
global expression
expression = expression + str(num)
equation.set(expression)
def equalpress():
try:
global expression
total = str(eval(expression))
equation.set(total)
expression = ""
except:
equation.set("error")
expression = ""
def clear():
global expression
expression = ""
equation.set("")
if __name__ == "__main__":
gui = Tk()
gui.configure(background="grey")
gui.title("Calculator Using Python")
gui.geometry("550x350")
equation = StringVar()
expression_field = Entry(gui, textvariable=equation)
expression_field.grid(columnspan=10, ipadx=70)
equation.set("Enter your expression")
button1 = Button(gui, text = '1', fg='black', bg='white', command=lambda: press(1), height=3, width=7)
button1.grid(row=2, column=0)
button2 = Button(gui, text='2', fg='black', bg='white', command=lambda: press(2), height=3, width=7)
button2.grid(row=2, column=1)
button3 = Button(gui, text='3', fg='black', bg='white', command=lambda: press(3), height=3, width=7)
button3.grid(row=2, column=2)
button4 = Button(gui, text='4', fg='black', bg='white', command = lambda: press(4), height=3, width=7)
button4.grid(row=3, column=0)
button5 = Button(gui, text=' 5 ', fg='black', bg='white', command=lambda: press(5), height=3, width=7)
button5.grid(row=3, column=1)
button6 = Button(gui, text='6', fg='black', bg='white', command=lambda: press(6), height=3, width=7)
button6.grid(row=3, column=2)
button7 = Button(gui, text='7', fg='black', bg='white', command= lambda: press(7), height=3, width=7)
button7.grid(row=4, column=0)
button8 = Button(gui, text='8', fg='black', bg='white', command= lambda: press(8), height=3, width=7)
button8.grid(row=4, column=1)
button9 = Button(gui, text='9', fg='black', bg='white', command= lambda: press(9), height=3, width=7)
button9.grid(row=4, column=2)
button0 = Button(gui, text='0', fg='black', bg='white', command= lambda: press(0), height=3, width=7)
button0.grid(row=5, column=0)
plus = Button(gui, text=' + ', fg='black', bg='white',command=lambda: press("+"), height=3, width=7)
plus.grid(row=2, column=3)
minus = Button(gui, text=' - ', fg='black', bg='white',command=lambda: press("-"), height=3, width=7)
minus.grid(row=3, column=3)
multiply = Button(gui, text=' * ', fg='black', bg='white',command=lambda: press("*"), height=3, width=7)
multiply.grid(row=4, column=3)
divide = Button(gui, text=' / ', fg='black', bg='white',command=lambda: press("/"), height=3, width=7)
divide.grid(row=5, column=3)
equal = Button(gui, text=' = ', fg='black', bg='white',command=equalpress, height=3, width=7)
equal.grid(row=5, column=2)
clear = Button(gui, text='Clear', fg='black', bg='white',command=clear, height=3, width=7)
clear.grid(row=5, column='1')
# start the GUI
gui.mainloop()