Generator pipelining hard

generatory_pipe_hard.py

def employees():
    for y in ['Bob', 'Sally', 'Jake']:
        yield y

def customers():
    for ex in ['James', 'Ted', 'Kent']:
        yield ex

def retrieve_all_users():
    for employee in employees():
        yield employee

    for customer in customers():
        yield customer

for user in retrieve_all_users():
    print(user)