Syed Shayan Shahid

``` import tkinter as tk import tkinter.messagebox from tkinter.constants import SUNKEN class Calculator(tk.Tk): def __init__(self): super().__init__() self.title('Calculator') self._build_ui() self._bind_keys() def _build_ui(self): self.frame = tk.Frame(self, bg="skyblue", padx=10) self.frame.pack() self.entry = tk.Entry(self.frame,...