input: from typing import Dict
  
  class StoreItem:
      def __init__(self, item_id: int, name: str, price: float, description: str):
          """Define a class representing an online store item with fields for ID, name, price, and description.
          This class also provides methods to convert the item to a string and to a dictionary.
          >>> item = StoreItem(1, 'Book', 19.99, 'A great read')
          >>> print(item)
          Book, $19.99
          >>> item.to_dict()
          {'item_id': 1, 'name': 'Book', 'price': 19.99, 'description': 'A great read'}
          """
          self.item_id = item_id
          self.name = name
          self.price = price
          self.description = description
  
      def __str__(self) -> str:
          return f'{self.name}, ${self.price}'
  
      def to_dict(self) -> Dict:
          return {
              'item_id': self.item_id,
              'name': self.name,
              'price': self.price,
              'description': self.description
          }
output:     
      def __repr__(self) -> str:
          return f'StoreItem(item_id={self.item_id}, name={self.name}, price={self.price}, description={self.description})'
  