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Chapter 9
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‎Ch9/average_orders.py‎

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orders_per_day = [56, 41, 49, 22, 71, 43, 18]
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average_orders = sum(orders_per_day) // len(orders_per_day)
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print(average_orders)

‎Ch9/brew_map.py‎

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orders = ['cold brew', 'lemongrass tea', 'chai latte', 'medium drip',
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'french press', 'mocha cappuccino', 'pumpkin spice latte',
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'double-shot espresso', 'dark roast drip', 'americano']
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def brew(order):
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print(f"Making {order}...")
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return order
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for order in map(brew, orders):
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print(f"One {order} is ready!")

‎Ch9/cafequeue.py‎

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class CafeQueue:
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def __init__(self):
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self._queue = []
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self._orders = {}
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self._togo = {}
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def __iter__(self):
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return CafeQueueIterator(self)
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def add_customer(self, customer, *orders, to_go=True):
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self._queue.append(customer)
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self._orders[customer] = tuple(orders)
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self._togo[customer] = to_go
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def __len__(self):
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return len(self._queue)
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def __contains__(self, customer):
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return (customer in self._queue)
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class CafeQueueIterator:
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def __init__(self, cafe_queue):
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self._cafe = cafe_queue
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self._position = 0
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def __next__(self):
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try:
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customer = self._cafe._queue[self._position]
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except IndexError:
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raise StopIteration
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orders = self._cafe._orders[customer]
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togo = self._cafe._orders[customer]
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self._position += 1
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return (customer, orders, togo)
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def __iter__(self):
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return self
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queue = CafeQueue()
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queue.add_customer('Newman', 'tea', 'tea', 'tea', 'tea', to_go=False)
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queue.add_customer('James', 'medium roast drip, milk, 2 sugar substitutes')
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queue.add_customer('Glen', 'americano, no sugar, heavy cream')
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queue.add_customer('Jason', 'pumpkin spice latte', to_go=False)
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print(len(queue)) # prints 4
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print('Glen' in queue) # prints True
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print('Kyle' in queue) # prints False
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def brew(order):
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print(f"(Making {order}...)")
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return order
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for customer, orders, to_go in queue:
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for order in orders: brew(order)
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if to_go:
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print(f"Order for {customer}!")
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else:
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print(f"(Takes order to {customer})")

‎Ch9/checkout_dict_eafp.py‎

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menu = {'drip': 1.95, 'cappuccino': 2.95, 'americano': 2.49}
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def checkout(order):
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try:
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print(f"Your total is {menu[order]}")
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except KeyError:
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print("That item is not on the menu.")
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checkout("drip") # prints "Your total is 1.95"
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checkout("tea") # prints "That item is not on the menu."

‎Ch9/checkout_dict_lbyl.py‎

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menu = {'drip': 1.95, 'cappuccino': 2.95, 'americano': 2.49}
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def checkout(order):
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if order in menu:
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print(f"Your total is {menu[order]}")
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else:
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print("That item is not on the menu.")
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checkout("drip") # prints "Your total is 1.95"
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checkout("tea") # prints "That item is not on the menu."

‎Ch9/coffeeorder_namedtuple.py‎

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from collections import namedtuple
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CoffeeOrder = namedtuple("CoffeeOrder", ('item', 'addons', 'to_go'))
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order = CoffeeOrder('pumpkin spice latte', ('whipped cream',), True)
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print(order.item) # prints 'pumpkin spice latte'
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print(order[2]) # prints 'True'

‎Ch9/customers_deque.py‎

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from collections import deque
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customers = deque(['Daniel', 'Denis'])
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customers.append('Simon')
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print(customers) # prints deque(['Daniel', 'Denis', 'Simon'])
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customer = customers.popleft()
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print(customer) # prints 'Daniel'
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print(customers) # prints deque(['Denis', 'Simon'])
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customers.appendleft('James')
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print(customers) # prints deque(['James', 'Denis', 'Simon'])
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last_in_line = customers.pop()
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print(last_in_line) # prints 'Simon'
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print(customers) # prints deque(['James', 'Denis'])

‎Ch9/double_orders.py‎

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orders = ["pumpkin spice latte", "caramel macchiato", "mocha cappuccino"]
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new_orders = orders[:]
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for order in orders:
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# ... do whatever ...
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new_orders.append(order)
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orders = new_orders
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print(orders)

‎Ch9/enumerate_orders.py‎

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for number, (customer, drink) in enumerate(customers, start=1):
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print(f"#{number}. {customer}: {drink}")

‎Ch9/get_number.py‎

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number = None
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while number is None:
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try:
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raw = input("Enter a number ('q' to quit): ")
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if raw == 'q':
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break
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number = int(raw)
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except ValueError:
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print("You must enter a number.")
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else:
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print(f"You entered {number}")

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