input: def generate_store_item():
      """Generate a Python class for an online store item that includes fields for ID, name, price, and description.
      >>> item = generate_store_item()
      >>> item_instance = item(1, 'Laptop', 999.99, 'High-performance laptop')
      >>> print(item_instance)
      'Laptop, $999.99'
      >>> item_instance.to_dict()
      {'item_id': 1, 'name': 'Laptop', 'price': 999.99, '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