old_contents: class VendingMachine():
  
      def __init__(self, items, money):
          self.items = dict(enumerate(items))
          self.money = money
  
      def vend(self, selection, item_money):
          try:
              n,v = [(n,self.items[n]) for n in self.items 
                        if (self.items[n]['code']).lower() == selection.lower()][0]       
          except:
              return "Invalid selection! : Money in vending machine = {:.2f}".format(self.money)
              
          if item_money < v['price']:
          
              return "Not enough money!"
              
          if v['quantity'] <= 0:
          
              return "{}: Out of stock!".format(v['name'])
              
          if item_money > v['price']:
          
              change        = item_money - v['price']
              v['quantity'] = v['quantity'] - 1
              self.money   += (-change + item_money)
              self.items[n] = v
              
              return "Vending {} with {:.2f} change.".format(v['name'], change)
              
          else:
          
              v['quantity'] = v['quantity'] - 1
              self.money   += item_money
              self.items[n] = v
              
              return "Vending {}".format(v['name'])
  
new_contents: class VendingMachine():
  
      def __init__(self, items, money):
          self.items = dict(enumerate(items))
          self.money = money
  
      def vend(self, selection, item_money):
          try:
              n,v = [(n,self.items[n]) for n in self.items 
                        if (self.items[n]['code']).lower() == selection.lower()][0]       
          except:
              return "Invalid selection! : Money in vending machine = {:.2f}".format(self.money)
              
          if item_money < v['price']:
              return "Not enough money!"
              
          if v['quantity'] <= 0:
              return "{}: Out of stock!".format(v['name'])
              
          if item_money > v['price']:
              change        = item_money - v['price']
              v['quantity'] = v['quantity'] - 1
              self.money   += (-change + item_money)
              self.items[n] = v
              
              return "Vending {} with {:.2f} change.".format(v['name'], change)
              
          else:
              v['quantity'] = v['quantity'] - 1
              self.money   += item_money
              self.items[n] = v
              
              return "Vending {}".format(v['name'])
  
subject: Update 6kyu_vending_machine.py