import tkinter as tk # Create main window root = tk.Tk() root.title("Simple Calculator") root.geometry("300x400") root.resizable(False, False) # Entry widget to display the expression expression = "" def press(num): global expression expression += str(num) equation.set(expression) def clear(): global expression expression = "" equation.set("") def equalpress(): try: global expression total = str(eval(expression)) # Evaluate the math expression equation.set(total) expression = total except: equation.set("Error") expression = "" # StringVar() to update entry box dynamically equation = tk.StringVar() # Entry field entry_field = tk.Entry(root, textvariable=equation, font=('Arial', 20), bd=10, insertwidth=2, width=14, borderwidth=4, relief="ridge", justify='right') entry_field.grid(row=0, column=0, columnspan=4, pady=10) # Button layout buttons = [ ('7',1,0), ('8',1,1), ('9',1,2), ('/',1,3), ('4',2,0), ('5',2,1), ('6',2,2), ('*',2,3), ('1',3,0), ('2',3,1), ('3',3,2), ('-',3,3), ('0',4,0), ('.',4,1), ('+',4,2), ('=',4,3) ] # Create buttons dynamically for (text, row, col) in buttons: if text == '=': tk.Button(root, text=text, padx=20, pady=20, bg="lightgreen", command=equalpress).grid(row=row, column=col, padx=5, pady=5) else: tk.Button(root, text=text, padx=20, pady=20, command=lambda t=text: press(t)).grid(row=row, column=col, padx=5, pady=5) # Clear button tk.Button(root, text='C', padx=20, pady=20, bg="lightcoral", command=clear).grid(row=5, column=0, columnspan=4, sticky="we", padx=5, pady=5) # Start the main loop root.mainloop()