input: 
  def calculate_total_cost(items, shipping_cost, tax_rate):
      """Calculate the total cost of a shopping cart, including item prices, quantity, shipping cost, and 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)
      99.125
      """
      total_cost = 0
      for item in items:
          total_cost += item['price'] * item['quantity']
      total_cost += total_cost * tax_rate
      total_cost += shipping_cost
      return total_cost
  
output:     total_cost = 0
      for item in items:
          total_cost += item['price'] * item['quantity']
      total_cost += total_cost * tax_rate
      total_cost += shipping_cost
      return total_cost