Calculator GUI

import tkinter as tk

# Initialize the window
window = tk.Tk()
window.title("Calculator")

# Entry widget to display and input numbers
entry = tk.Entry(window, width=25, font=("Arial", 12))
entry.grid(row=0, column=0, columnspan=4, padx=10, pady=10)

# Function to handle button clicks
def button_click(number):
    current = entry.get()
    entry.delete(0, tk.END)
    entry.insert(tk.END, current + str(number))

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

def button_equal():
    try:
        result = eval(entry.get())
        entry.delete(0, tk.END)
        entry.insert(tk.END, result)
    except Exception:
        entry.delete(0, tk.END)
        entry.insert(tk.END, "Error")

# Create number buttons
buttons = [
    ("7", 1, 0),
    ("8", 1, 1),
    ("9", 1, 2),
    ("4", 2, 0),
    ("5", 2, 1),
    ("6", 2, 2),
    ("1", 3, 0),
    ("2", 3, 1),
    ("3", 3, 2),
    ("0", 4, 0),
]

for button in buttons:
    text, row, column = button
    tk.Button(window, text=text, width=5, height=2, command=lambda t=text: button_click(t)).grid(row=row, column=column)

# Create operator buttons
operators = [
    ("+", 1, 3),
    ("-", 2, 3),
    ("*", 3, 3),
    ("/", 4, 3),
    ("=", 4, 2),
    ("C", 4, 1),
]

for operator in operators:
    text, row, column = operator
    if text == "=":
        tk.Button(window, text=text, width=5, height=2, command=button_equal).grid(row=row, column=column)
    elif text == "C":
        tk.Button(window, text=text, width=5, height=2, command=button_clear).grid(row=row, column=column)
    else:
        tk.Button(window, text=text, width=5, height=2, command=lambda t=text: button_click(t)).grid(row=row, column=column)

window.mainloop()