diff --git a/squirrelbattle/entities/friendly.py b/squirrelbattle/entities/friendly.py
index 15ce8d1..0e7ac1c 100644
--- a/squirrelbattle/entities/friendly.py
+++ b/squirrelbattle/entities/friendly.py
@@ -3,7 +3,7 @@ from ..translations import gettext as _
 from .player import Player
 from .items import Item
 from random import choice
-from typing import Dict, Tuple, Any
+from typing import Any
 
 
 class Merchant(FriendlyEntity):
@@ -51,7 +51,7 @@ class Merchant(FriendlyEntity):
         d = super().save_state()
         d["inventory"] = [item.save_state() for item in self.inventory]
         return d
-    
+
     def add_to_inventory(self, obj: Any) -> None:
         """
         Adds an object to inventory
diff --git a/squirrelbattle/entities/items.py b/squirrelbattle/entities/items.py
index 5148a5c..87c9ba1 100644
--- a/squirrelbattle/entities/items.py
+++ b/squirrelbattle/entities/items.py
@@ -17,8 +17,8 @@ class Item(Entity):
     held_by: Optional[Player]
     price: int
 
-    def __init__(self, held: bool = False, held_by: Optional[Player] = None, price : int=2,
-                 *args, **kwargs):
+    def __init__(self, held: bool = False, held_by: Optional[Player] = None,
+                 price: int = 2, *args, **kwargs):
         super().__init__(*args, **kwargs)
         self.held = held
         self.held_by = held_by
@@ -66,27 +66,30 @@ class Item(Entity):
     def get_all_items() -> list:
         return [BodySnatchPotion, Bomb, Heart, Sword]
 
-    def be_sold(self, buyer: Entity, seller: Entity, game :  Any) -> bool:
+    def be_sold(self, buyer: Entity, seller: Entity, game: Any) -> bool:
         """
         Does all necessary actions when an object is to be sold.
-        Is overwritten by some classes that cannot exist in the player's inventory
+        Is overwritten by some classes that cannot exist in the player's
+        inventory
         """
-        if buyer.hazel>=self.price :
+        if buyer.hazel >= self.price:
             buyer.add_to_inventory(self)
             seller.remove_from_inventory(self)
             buyer.change_hazel_balance(-self.price)
             seller.change_hazel_balance(self.price)
             return True
-        else :
+        else:
             return False
 
+
 class Heart(Item):
     """
     A heart item to return health to the player
     """
     healing: int
 
-    def __init__(self, name: str = "heart", healing: int = 5, price: int = 3, *args, **kwargs):
+    def __init__(self, name: str = "heart", healing: int = 5, price: int = 3,
+                 *args, **kwargs):
         super().__init__(name=name, price=price, *args, **kwargs)
         self.healing = healing
 
@@ -105,20 +108,21 @@ class Heart(Item):
         d["healing"] = self.healing
         return d
 
-    def be_sold(self, buyer: Entity, seller: Entity, game: Any) -> str:
+    def be_sold(self, buyer: Entity, seller: Entity, game: Any) -> bool:
         """
         Does all necessary actions when an object is to be sold.
-        Is overwritten by some classes that cannot exist in the player's inventory
+        Is overwritten by some classes that cannot exist in the player's
+        inventory
         """
-        if buyer.hazel>=self.price :
+        if buyer.hazel >= self.price:
             self.hold(buyer)
             seller.remove_from_inventory(self)
             buyer.change_hazel_balance(-self.price)
             seller.change_hazel_balance(self.price)
             return True
-        else :
+        else:
             return False
-        
+
 
 class Bomb(Item):
     """
@@ -212,7 +216,8 @@ class BodySnatchPotion(Item):
     other entity.
     """
 
-    def __init__(self, name: str = "body_snatch_potion", price: int = 14, *args, **kwargs):
+    def __init__(self, name: str = "body_snatch_potion", price: int = 14,
+                 *args, **kwargs):
         super().__init__(name=name, price=price, *args, **kwargs)
 
     def use(self) -> None:
diff --git a/squirrelbattle/game.py b/squirrelbattle/game.py
index 1dc4fc0..34ce960 100644
--- a/squirrelbattle/game.py
+++ b/squirrelbattle/game.py
@@ -195,7 +195,7 @@ class Game:
             if key == KeyValues.ENTER:
                 item = self.store_menu.validate()
                 flag = item.be_sold(self.player, self.store_menu.merchant, self)
-                if not flag :
+                if not flag:
                     self.message = _("You do not have enough money")
                     self.display_actions(DisplayActions.UPDATE)
             # Ensure that the cursor has a good position