Exercise

Writing your own functions

You've seen how to write functions. Now it's time to practice and write your own. In this exercise, you'll be writing a function to calculate the cost of a customer's order. Pre-defined is a dictionary restaurant_menu with menu items as keys and their corresponding prices as values, and you, as the restaurant owner, want to use this dictionary mapping to calculate the total price of a customer's order.

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The first step here is to define a function called calculate_order_cost, which should take an unlimited number of arguments called items, as customers can order as much as they want!