[Python] Why does item_cost not get subtracted from whiskers (my games form of currency)?

Im currently working in Pygame, and when the item is pressed, it should compare the item_cost and the whiskers (a form of currency) first, then it should subtract them if it is less - however, even when I have given myself 30 whiskers and the cost of the item is 5, it tells me I do not have enough whiskers.

I believe that I have left in and included all of the code being used within the calling. If anyone could help and explain - That would be appreciated.

class Inventory:
#holds items
def __init__(self, defense, x, y, img, item_cost):
self.x = x
self.y = y
self.width = img.get_width()
self.height = img.get_height()
self.item_cost = item_cost
self.buttons = []
self.items = 0
self.bg = pygame.image.load('inventory.png').convert_alpha()
self.font = pygame.font.SysFont("cherri.ttf", 25)
self.defense = defense

def add_slot(self, img, name):
self.items += 1
self.buttons.append(InventorySlot(self, img, name))
print("works")

def draw(self, Screen):
Screen.blit(self.bg, (self.x - self.bg.get_width()/2 , self.y-10))

def get_clicked(self, X, Y):
for bu in self.buttons:
if bu.click(X,Y):
return bu.name, item_cost

return None

def update(self):
for btn in self.buttons:
btn.update()



class Holder(Inventory):
def __init__(self, x, y, img):
self.x = x
self.y = y
self.width = img.get_width()
self.height = img.get_height()
self.hold = []
self.items = 0
self.bg = img
self.buttons = []
self.font = pygame.font.SysFont("Mulan.ttf", 25)

def add_slot(self, img, name, cost):
self.items += 1
slotx = self.x - 40
sloty = self.y-150 + (self.items-1)*100
self.hold.append(HolderSlot(slotx, sloty, img, name, cost))

def get_item_cost(self, name):
for hld in self.hold:
if hld.name == name:
return hld.cost
return -1

def draw(self, screen):
global whiskersimg
screen.blit(self.bg, (self.x - self.bg.get_width()/2 - 100, self.y-120))
for item in self.hold:
item.draw(screen)
screen.blit(whiskersimg, (item.x-40, item.y + item.height))
text = self.font.render(str(item.cost), 1, (255,255,255))
screen.blit(text, (item.x + item.width/2 - text.get_width()/2 - 40, item.y + item.height - 100))

class Game(): def __init__(self):
global browncat, browncat, whitecat, gingercat, tabbycat, whitestripecat, buyblack,buybrown,buywhite,buytabby,buyginger,buywhitestripe
global ScreenWidth, ScreenHeight, objectWidth, objectHeight, Screen, v, x, y, Playing, Shopping, development, pause, Instructions, whiskers, TabbyCat, WhiteCat, GingerCat, BrownCat, BlackCat, WhiteStripeCat, tilesize, FPS, screen
pygame.init()
self.selected_defense = None #no defense selected
self.defense = [] #array of defense
self.Inventory = Holder(ScreenWidth - gingercat.get_width() + 70, 250, gingercat)
self.screen = Screen
self.selectdefense = None
self.attack_towers = []
self.support_towers = []

[...]

def playing(self):
global Playing
global whiskers
global development
global pause
global x
global y
global TabbyCat # Add this line
global WhiteCat # Add this line
global GingerCat # Add this line
global BlackCat # Add this line
global BrownCat # Add this line
global WhiteStripeCat # Add this line

[...]

while Playing == True:
[...]
if pause == False and development == False:
pygame.time.delay(10)
Screen.fill((0))
self.Background(self.mapim) # moved background
gamegrid = Grid(30, 44, 40) # grid create
gamegrid.draw(Screen) # draw the grid

self.charactergroup.update() # update
self.charactergroup.draw(Screen) # draw the enemyim on screen
timer.update()
timer.output(Screen) # output not draw
whisker.output(Screen, Screen) # outputs whisker
self.new()
self.update()
#self.all_sprites.draw(Screen)
#for df in self.defense:
#df.draw(self.Screen)
self.Inventory.add_slot(buytabby, "Buy Tabby Cat", 5)
self.Inventory.add_slot(buyginger, "Buy Ginger cat", 10)
self.Inventory.add_slot(buywhite, "Buy White Cat", 15)
self.Inventory.add_slot(buyblack, "Buy Black Cat", 20)
self.Inventory.add_slot(buybrown, "Buy Brown Cat", 35)
self.Inventory.add_slot(buywhitestripe, "Buy White Striped Cat", 50)
self.Inventory.draw(self.screen)
pos = pygame.mouse.get_pos()
defclick = self.Inventory.get_clicked(pos[0], pos[1])
pygame.display.update()



for event in pygame.event.get():
if event.type == pygame.QUIT:
Playing = False
if event.type == pygame.KEYDOWN:
if event.key == K_d: # Press 'd' to enter development mode
development = True

elif event.type == pygame.MOUSEBUTTONDOWN and event.button == 1:
mouse_pos = pygame.mouse.get_pos()
cat = Cats(cursor_cats, mouse_pos)
cats_group.add(cat)

if event.type == pygame.KEYDOWN and event.key == pygame.K_i: # i opens inventory
Inventory()

if event.type == pygame.KEYDOWN:
if event.key == K_p:
pause = True

if event.type == pygame.MOUSEBUTTONDOWN:
if event.button == 1: #check left button pressed
if defclick:
cost = self.Inventory.get_item_cost(defclick) #checks prices against whiskers
print("touched")
if whiskers >= cost: #prices = great
whiskers -= cost #take cost from whiskers
self.add_defense(defclick)
else:
print("Not enough whiskers.")



pygame.display.update()

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