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master master.title("Calculator") # Create the entry field self.entry = tk.Entry(master, width=30, justify='right', font=('Arial', 16)) self.entry.grid(row=0, column=0, columnspan=4, padx=10, pady=10) # Create the buttons self.create_button("1", 1, 0) self.create_button("2", 1, 1)