From 5ca7507a888c709068ad64067c4aa72a1ae803ff Mon Sep 17 00:00:00 2001
From: Eli <>
Date: Tue, 3 Feb 2026 14:47:44 +0100
Subject: [PATCH] Classe Expression

---
 expression.py | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/expression.py b/expression.py
index 999a7f5..63412fc 100644
--- a/expression.py
+++ b/expression.py
@@ -43,11 +43,18 @@ polonaise inversée et renvoyant l’arbre (de type Expression) correspondant"""
     pile = p()
     for elem in liste_npi :
         if elem == "+" :
-            exp = Expression("+", Expression(Expression()))                
+            droit = pile.depiler()
+            gauche = p.depiler()
+            exp = Expression(elem, gauche, droit)
+            p.empiler(exp)
         elif elem == "*" :
-            exp = Expression("*", Expression(Expression()))
+            droit = pile.depiler()
+            gauche = pile.depiler()
+            exp = Expression(elem, gauche, droit)
+            pile.empiler(exp)
         else :
-            pass
-    return pile[-1]
+            exp = Expression(elem, None, None)
+            pile.empiler(exp)
+    return p.sommet()
             
             
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