calculatorGUI.py

import tkinter as tk

calculation = ""

def add_to_calulation(symbol):
    global calculation
    calculation += str(symbol)
    text_result.delete(1.0, 'end')
    text_result.insert(1.0, calculation)

def evaluate_calculation():
    global calculation
    try:
        calculation = str(eval(calculation))
        text_result.delete(1.0, 'end')
        text_result.insert(1.0, calculation)
    except:
        clear_field()
        text_result.insert(1.0, 'Error')
    

def clear_field():
    global calculation
    calculation = ""
    text_result.delete(1.0, 'end')

root = tk.Tk()
root.geometry("300x275")

text_result = tk.Text(root, height=2, width=16, font=("Arial", 24))
text_result.grid(columnspan=5)

btn_1 = tk.Button(root, text='1', command=lambda: add_to_calulation(1), width=5, font=('Arial', 14))
btn_1.grid(row=2, column=1)
btn_2 = tk.Button(root, text='2', command=lambda: add_to_calulation(2), width=5, font=('Arial', 14))
btn_2.grid(row=2, column=2)
btn_3 = tk.Button(root, text='3', command=lambda: add_to_calulation(3), width=5, font=('Arial', 14))
btn_3.grid(row=2, column=3)
btn_4 = tk.Button(root, text='4', command=lambda: add_to_calulation(4), width=5, font=('Arial', 14))
btn_4.grid(row=3, column=1)
btn_5 = tk.Button(root, text='5', command=lambda: add_to_calulation(5), width=5, font=('Arial', 14))
btn_5.grid(row=3, column=2)
btn_6 = tk.Button(root, text='6', command=lambda: add_to_calulation(6), width=5, font=('Arial', 14))
btn_6.grid(row=3, column=3)
btn_7 = tk.Button(root, text='7', command=lambda: add_to_calulation(7), width=5, font=('Arial', 14))
btn_7.grid(row=4, column=1)
btn_8 = tk.Button(root, text='8', command=lambda: add_to_calulation(8), width=5, font=('Arial', 14))
btn_8.grid(row=4, column=2)
btn_9 = tk.Button(root, text='9', command=lambda: add_to_calulation(9), width=5, font=('Arial', 14))
btn_9.grid(row=4, column=3)
btn_0 = tk.Button(root, text='0', command=lambda: add_to_calulation(0), width=5, font=('Arial', 14))
btn_0.grid(row=5, column=2)
btn_plus = tk.Button(root, text='+', command=lambda: add_to_calulation('+'), width=5, font=('Arial', 14))
btn_plus.grid(row=2, column=4)
btn_minus = tk.Button(root, text='-', command=lambda: add_to_calulation('-'), width=5, font=('Arial', 14))
btn_minus.grid(row=3, column=4)
btn_multiplication = tk.Button(root, text='*', command=lambda: add_to_calulation('*'), width=5, font=('Arial', 14))
btn_multiplication.grid(row=4, column=4)
btn_division = tk.Button(root, text='/', command=lambda: add_to_calulation('/'), width=5, font=('Arial', 14))
btn_division.grid(row=5, column=4)
btn_open = tk.Button(root, text='(', command=lambda: add_to_calulation('('), width=5, font=('Arial', 14))
btn_open.grid(row=5, column=1)
btn_close = tk.Button(root, text=')', command=lambda: add_to_calulation(')'), width=5, font=('Arial', 14))
btn_close.grid(row=5, column=3)
btn_equals = tk.Button(root, text='=', command=evaluate_calculation, width=11, font=('Arial', 14))
btn_equals.grid(row=6, column=3, columnspan=2)
btn_clear = tk.Button(root, text='C', command=clear_field, width=11, font=('Arial', 14))
btn_clear.grid(row=6, column=1, columnspan=2)
root.mainloop()