calculator.py

import tkinter as tk
from tkinter import messagebox
from tkinter.constants import SUNKEN

window = tk.Tk()
window.title("Calculator")

frame = tk.Frame(master=window, bg="gray", padx=10, pady=10)
frame.pack()

entry = tk.Entry(master=frame, relief=SUNKEN, width=30)
entry.grid(row=0, column=0, columnspan=4, pady=2, padx=2)

def btn_click(number):
    entry.insert(tk.END, number)

def equal():
    try:
        y = str(eval(entry.get()))
        entry.delete(0, tk.END)
        entry.insert(0, y)
    except:
        messagebox.showerror("Error", "Syntax Error")

def clear():
    entry.delete(0, tk.END)

# Create number buttons
for i in range(1, 10):
    btn = tk.Button(master=frame, text=str(i), command=lambda i=i: btn_click(i))
    btn.grid(row=(i-1)//3+1, column=(i-1)%3, pady=2, padx=2)

# Other buttons
btn_0 = tk.Button(master=frame, text="0", command=lambda: btn_click(0))
btn_0.grid(row=4, column=1, pady=2, padx=2)

btn_clear = tk.Button(master=frame, text="C", command=clear)
btn_clear.grid(row=4, column=0, pady=2, padx=2)

btn_equal = tk.Button(master=frame, text="=", command=equal)
btn_equal.grid(row=4, column=2, pady=2, padx=2)

# Operator buttons
operators = ['+', '-', '*', '/']
for i, op in enumerate(operators):
    btn = tk.Button(master=frame, text=op, command=lambda op=op: btn_click(op))
    btn.grid(row=i+1, column=3, pady=2, padx=2)

window.mainloop()