challenge 2 ok

birdie.py

@@ -9,7 +9,8 @@ def on_mouse_down() :
         titi.speed = 6.5
 
 def on_key_down(key) :
-    print(key)
+    if key== keys.F :
+        titi.invincible = True
 
 def reset():
     print("Retour au départ...")
@@ -18,12 +19,14 @@ def reset():
     tube_superieur.center = (300, 0)
     tube_inferieur.center = (300, tube_superieur.height + ecart)
     titi.vivant = True
+    titi.invincible = False
     titi.image = "bird1"
 
 def heurte_tube() :
     print ("Paf !")
-    titi.image = "birddead" # (oiseau mort)
-    titi.vivant = False
+    if titi.invincible==False:
+        titi.image = "birddead" # (oiseau mort)
+        titi.vivant = False
     
 def update():
     titi.speed += gravite