input: def generate_store_item_class():
      """Generates a Python class for an online store item that includes fields for ID, name, price, and description.
      >>> item = generate_store_item_class()(1, 'Laptop', 899.99, 'High-performance laptop')
      >>> str(item)
      'Laptop, $899.99'
      >>> item.to_dict()
      {'item_id': 1, 'name': 'Laptop', 'price': 899.99, 'description': 'High-performance laptop'}
      """
      class StoreItem:
          def __init__(self, item_id, name, price, description):
              self.item_id = item_id
              self.name = name
              self.price = price
              self.description = description
  
          def __str__(self):
              return f'{self.name}, ${self.price}'
  
          def to_dict(self):
              return {
                  'item_id': self.item_id,
                  'name': self.name,
                  'price': self.price,
                  'description': self.description
              }
      return StoreItem
output:     class StoreItem:
          def __init__(self, item_id, name, price, description):
              self.item_id = item_id
              self.name = name
              self.price = price
              self.description = description
  
          def __str__(self):
              return f'{self.name}, ${self.price}'
  
          def to_dict(self):
              return {
                  'item_id': self.item_id,
                  'name': self.name,
                  'price': self.price,
                  'description': self.description
              }
      return StoreItem