---

import tkinter as tk


# Добавление символа в поле
def button_click(value):
    entry.insert(tk.END, value)


# Вычисление результата
def calculate():
    try:
        result = eval(entry.get())
        entry.delete(0, tk.END)
        entry.insert(0, result)
    except:
        entry.delete(0, tk.END)
        entry.insert(0, "Ошибка")


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


# Главное окно
window = tk.Tk()
window.title("Мини-калькулятор")
window.geometry("300x350")
window.resizable(False, False)


# Поле вывода
entry = tk.Entry(
    window,
    font=("Arial", 20),
    justify="right",
    width=15
)
entry.grid(row=0, column=0, columnspan=4, padx=10, pady=10)


# Кнопки
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),
    ("C", 4, 1),
    ("=", 4, 2),
    ("+", 4, 3)
]


for text, row, column in buttons:
    if text == "C":
        command = clear
    elif text == "=":
        command = calculate
    else:
        command = lambda value=text: button_click(value)

    tk.Button(
        window,
        text=text,
        font=("Arial", 16),
        width=5,
        height=2,
        command=command
    ).grid(
        row=row,
        column=column,
        padx=3,
        pady=3
    )


# Запуск
window.mainloop()