Projet Tkinter : calculatrice

import tkinter as tk

class Calculatrice(tk.Tk):

    def __init__(self):
        super().__init__()
        self.title("Calculatrice")
        self.resizable(False, False)
        self.expression = tk.StringVar(value="0")
        self._en_cours   = ""      # expression en construction
        self._creer_interface()
        self._lier_clavier()

    def _creer_interface(self):
        # Affichage
        affichage = tk.Entry(
            self, textvariable=self.expression,
            font=("Arial", 22), justify="right",
            state="readonly", readonlybackground="#1a1a2e",
            fg="white", bd=0, width=16
        )
        affichage.grid(row=0, column=0, columnspan=4,
                       ipady=12, padx=2, pady=2)

        # Définition des boutons : (texte, ligne, colonne, colspan, couleur_fond)
        boutons = [
            ("C",   1, 0, 1, "#ef5350"), ("±",  1, 1, 1, "#757575"),
            ("%",   1, 2, 1, "#757575"), ("÷",  1, 3, 1, "#f57c00"),
            ("7",   2, 0, 1, "#2d2d44"), ("8",  2, 1, 1, "#2d2d44"),
            ("9",   2, 2, 1, "#2d2d44"), ("×",  2, 3, 1, "#f57c00"),
            ("4",   3, 0, 1, "#2d2d44"), ("5",  3, 1, 1, "#2d2d44"),
            ("6",   3, 2, 1, "#2d2d44"), ("−",  3, 3, 1, "#f57c00"),
            ("1",   4, 0, 1, "#2d2d44"), ("2",  4, 1, 1, "#2d2d44"),
            ("3",   4, 2, 1, "#2d2d44"), ("+",  4, 3, 1, "#f57c00"),
            ("0",   5, 0, 2, "#2d2d44"), (",",  5, 2, 1, "#2d2d44"),
            ("=",   5, 3, 1, "#1565c0"),
        ]

        for texte, ligne, col, colspan, couleur in boutons:
            btn = tk.Button(
                self, text=texte,
                font=("Arial", 16, "bold"),
                bg=couleur, fg="white",
                activebackground=couleur, activeforeground="white",
                relief="flat", bd=0, width=4, height=2,
                command=lambda t=texte: self._appuyer(t)
            )
            btn.grid(row=ligne, column=col, columnspan=colspan,
                     padx=2, pady=2, sticky="nsew")

        # Toutes les colonnes de taille égale
        for i in range(4):
            self.columnconfigure(i, weight=1)

    def _appuyer(self, touche):
        if touche == "C":
            self._en_cours = ""
            self.expression.set("0")

        elif touche == "=":
            self._calculer()

        elif touche == "±":
            try:
                val = float(self._en_cours or "0")
                self._en_cours = str(-val)
                self.expression.set(self._en_cours)
            except ValueError:
                pass

        elif touche == "%":
            try:
                val = float(self._en_cours or "0")
                self._en_cours = str(val / 100)
                self.expression.set(self._en_cours)
            except ValueError:
                pass

        else:
            # Remplacer les symboles affichés par les opérateurs Python
            correspondances = {"×": "*", "÷": "/", "−": "-", ",": "."}
            self._en_cours += correspondances.get(touche, touche)
            self.expression.set(self._en_cours)

    def _calculer(self):
        try:
            resultat = eval(self._en_cours)
            # Afficher sans .0 inutile pour les entiers
            if isinstance(resultat, float) and resultat.is_integer():
                resultat = int(resultat)
            self._en_cours = str(resultat)
            self.expression.set(self._en_cours)
        except ZeroDivisionError:
            self.expression.set("Division par 0")
            self._en_cours = ""
        except Exception:
            self.expression.set("Erreur")
            self._en_cours = ""

    def _lier_clavier(self):
        self.bind("", self._touche_clavier)

    def _touche_clavier(self, event):
        correspondances = {
            "Return": "=", "KP_Enter": "=", "Escape": "C",
            "Delete": "C", "BackSpace": "C",
        }
        touche = correspondances.get(event.keysym, event.char)
        if touche in "0123456789.+-*/=C%":
            self._appuyer(touche)

if __name__ == "__main__":
    app = Calculatrice()
    app.mainloop()