class Expression:
    def __init__(self, root, left, right):
        self.root = root
        self.left = left
        self.right = right

    def evaluate(self):
        if self.root == '+':
            return self.left.evaluate() + self.right.evaluate()
        elif self.root == '*':
            return self.left.evaluate() * self.right.evaluate()
        else:
            return int(self.root)

    def __str__(self):
        if self.root in ['+', '*']:
            return f'({self.left} {self.root} {self.right})'
        else:
            return str(self.root)

def npi2tree(npi_list):
    stack = []
    for item in npi_list:
        if item in ['+', '*']:
            right = stack.pop()
            left = stack.pop()
            stack.append(Expression(item, left, right))
        else:
            stack.append(Expression(item, None, None))
    return stack[0]

import tkinter as tk

def evaluate_expression():
    expression_text = entry.get()
    npi_list = expression_text.split()
    expression_tree = npi2tree(npi_list)
    result.set(expression_tree.evaluate())

root = tk.Tk()
root.configure(bg="orange")
root.title("Mini Calculatrice")

expression_label = tk.Label(root, text="Expression:")
expression_label.pack()

expression_label.configure(bg="beige")

entry = tk.Entry(root)
entry.pack()

calculate_button = tk.Button(root, text="Calculer", command=evaluate_expression)
calculate_button.configure(bg="beige")
calculate_button.pack()

result = tk.StringVar()
result_label = tk.Label(root, textvariable=result)
result_label.configure(bg="orange")
result_label.pack()

root.mainloop()