diff --git a/kelner/src/components/Drawable.py b/kelner/src/components/Drawable.py
index 02d91d7..694a226 100644
--- a/kelner/src/components/Drawable.py
+++ b/kelner/src/components/Drawable.py
@@ -1,10 +1,5 @@
 class Drawable:
 
-    GREY    = (128, 128, 128)
-    YELLOW  = (255, 255, 0)
-    RED     = (255, 0, 0)
-    GREEN   = (0, 255, 0)
-
     def __init__(self, x, y, minX, maxX, minY, maxY, cellSize, offset):
         self.__minX = minX
         self.__maxX = maxX
diff --git a/kelner/src/components/Waiter.py b/kelner/src/components/Waiter.py
index 445e69a..a9e3e4d 100644
--- a/kelner/src/components/Waiter.py
+++ b/kelner/src/components/Waiter.py
@@ -117,7 +117,7 @@ class Waiter(Drawable):
     def draw(self, screen):
         direction = self.getDirection()
         imageKind = None
-        if direction == Direction.LeftUp:
+        if direction == Direction.LeftUp: 
             imageKind = Images.WaiterLeftUp
         elif direction == Direction.Up:
             imageKind = Images.WaiterUp
diff --git a/kelner/src/managers/DrawableCollection.py b/kelner/src/managers/DrawableCollection.py
index 05d5216..a4f3fed 100644
--- a/kelner/src/managers/DrawableCollection.py
+++ b/kelner/src/managers/DrawableCollection.py
@@ -1,7 +1,7 @@
 import random
 from threading import Lock
 
-from kelner.src.components.Table import Table, Status
+from kelner.src.components.Table import Table
 from kelner.src.components.Waiter import Waiter
 
 
@@ -71,7 +71,7 @@ class DrawableCollection:
     def getReservedPlaces(self, waiter):
         cols = waiter.getMaxX() - waiter.getMinX() + 1
         rows = waiter.getMaxY() - waiter.getMinY() + 1
-        reservedPlaces = [[0] * cols for i in range(rows)]
+        reservedPlaces = [[0] * cols for _ in range(rows)]
         tables = self.getTables(None)
         if tables:
             for table in tables:
diff --git a/kelner/src/managers/ImageCache.py b/kelner/src/managers/ImageCache.py
index dc1815f..f1ad355 100644
--- a/kelner/src/managers/ImageCache.py
+++ b/kelner/src/managers/ImageCache.py
@@ -60,7 +60,7 @@ class ImageCache:
 
     def __getFont(self):
         if self.__font is None:
-            self.__font = font = pygame.font.SysFont('comicsansms', 24, True)
+            self.__font = pygame.font.SysFont('comicsansms', 24, True)
         return self.__font
 
     def getImage(self, imageKind, width, height):
diff --git a/kelner/src/managers/MenuManager.py b/kelner/src/managers/MenuManager.py
index 47b34d5..57e7eda 100644
--- a/kelner/src/managers/MenuManager.py
+++ b/kelner/src/managers/MenuManager.py
@@ -30,6 +30,6 @@ class MenuManager:
     def generateOrder(self):
         count = random.randint(self.__MinDishes, self.__MaxDishes)
         order = []
-        for i in range(0, count):
+        for _ in range(0, count):
             order += [(self.__menuCard[random.randint(0, len(self.__menuCard) - 1)])]
         return order