add bidirectionnal tab

python/bitab.py

@@ -0,0 +1,54 @@
+class Tableau:
+    def __init__(self, gauche, droite):
+        self.gauche = gauche
+        self.droite = droite
+
+    def imin(self):
+        return -len(self.gauche)
+
+    def imax(self):
+        return len(self.droite) - 1
+
+    def append(self, elt):
+        self.droite.append(elt)
+
+    def prepend(self, elt):
+        self.gauche.append(elt)
+
+    def __getitem__(self, i):
+        if i < 0:
+            try:
+                return self.gauche[i]
+            except IndexError:
+                print(f"erreur lors de l'index")
+        else:
+            try:
+                return self.droite[i]
+            except IndexError:
+                print("error")
+
+    def __setitem__(self, i, v):
+        if i < 0:
+            try:
+                self.gauche[i] = v
+            except IndexError:
+                print("error")
+        else:
+            try:
+                self.droite[i] = v
+            except IndexError:
+                print("error")
+
+    def __str__(self) -> str:
+        string = "|"
+        for i in self.gauche:
+            string += str(i) + "|"
+        for i in self.droite:
+            string += str(i) + "|"
+        return string
+
+
+if __name__ == "__main__":
+    tab = Tableau([1, 2], [3, 4])
+    tab.prepend(5)
+    print(tab.__str__())