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="white")
gui.title("Simple Calculator")
gui.geometry("262x525")
equation = StringVar()
expression_field = Entry(gui, textvariable=equation)
expression_field.grid(columnspan=4, ipadx=70)
button1 = Button(gui, text=' 1 ', fg='black', bg='light blue', command=lambda: press(1), height=7, width=7) button1.grid(row=2, column=0)
button2 = Button(gui, text=' 2 ', fg='black', bg='light blue', command=lambda: press(2), height=7, width=7) button2.grid(row=2, column=1)
button3 = Button(gui, text=' 3 ', fg='black', bg='light blue', command=lambda: press(3), height=7, width=7) button3.grid(row=2, column=2)
button4 = Button(gui, text=' 4 ', fg='black', bg='light blue', command=lambda: press(4), height=7, width=7) button4.grid(row=3, column=0)
button5 = Button(gui, text=' 5 ', fg='black', bg='light blue', command=lambda: press(5), height=7, width=7) button5.grid(row=3, column=1)
button6 = Button(gui, text=' 6 ', fg='black', bg='light blue', command=lambda: press(6), height=7, width=7) button6.grid(row=3, column=2)
button7 = Button(gui, text=' 7 ', fg='black', bg='light blue', command=lambda: press(7), height=7, width=7) button7.grid(row=4, column=0)
button8 = Button(gui, text=' 8 ', fg='black', bg='light blue', command=lambda: press(8), height=7, width=7) button8.grid(row=4, column=1)
button9 = Button(gui, text=' 9 ', fg='black', bg='light blue', command=lambda: press(9), height=7, width=7) button9.grid(row=4, column=2)
button0 = Button(gui, text=' 0 ', fg='black', bg='light blue', command=lambda: press(0), height=7, width=7) button0.grid(row=5, column=0)
plus = Button(gui, text=' + ', fg='black', bg='light blue', command=lambda: press("+"), height=7, width=7) plus.grid(row=2, column=3)
minus = Button(gui, text=' - ', fg='black', bg='light blue', command=lambda: press("-"), height=7, width=7) minus.grid(row=3, column=3)
multiply = Button(gui, text=' ', fg='black', bg='light blue', command=lambda: press(""), height=7, width=7) multiply.grid(row=4, column=3)
divide = Button(gui, text=' / ', fg='black', bg='light blue', command=lambda: press("/"), height=7, width=7) divide.grid(row=5, column=3)
equal = Button(gui, text=' = ', fg='black', bg='light blue', command=equalpress, height=7, width=7) equal.grid(row=5, column=2)
clear = Button(gui, text='Clear', fg='black', bg='light blue', command=clear, height=7, width=7) clear.grid(row=5, column='1')
Decimal= Button(gui, text='.', fg='black', bg='light blue', command=lambda: press('.'), height=2, width=7) Decimal.grid(row=6, column=0)
gui.mainloop()