input: def calculate_total_cost(items, shipping_cost, tax_rate):
      """ Calculate the total cost of a shopping cart considering item prices, quantity, 
      shipping cost, and any applicable taxes.
      >>> calculate_total_cost([
      ...     {"name": "widget", "price": 10, "quantity": 5},
      ...     {"name": "thingy", "price": 7, "quantity": 3},
      ...     {"name": "doodad", "price": 5, "quantity": 2},
      ... ], 7.50, 0.095)
      115.6
      """
      
output:     total_item_cost = sum(item["price"] * item["quantity"] for item in items)
      total_cost = total_item_cost + shipping_cost
      total_cost_with_tax = total_cost * (1 + tax_rate)
      return round(total_cost_with_tax, 1)