Generators Yield

generators-yield.py

import time

# As people enter the queue, take their order, but pause(yield) to make their sandwich
def get_next_customer():
    # people are going to be adding themselves to this queue and it will grow quickly
    list_of_customers = [('Bob', 'Ham Sandwich'), ('Paul', 'Grilled Cheese'), ('Sally', 'Chicken Croissant')]
    for an_order in list_of_customers:
        yield an_order


# make a sandwich, but pause(yield) to deliver it
def make_sandwiches():
    for customer in get_next_customer():
        time.sleep(1)  # making the sandwich for our customer
        yield (customer[0], customer[1])

sandwiches = make_sandwiches()

# deliver the sandwiches
for sandwich in sandwiches:
    print('Delivering sandwich:', sandwich[1], 'for', sandwich[0])