# Bad
def pay():
    for e in employees:
        pay = e.calculate_pay()
        e.deliver_pay(pay)

# Better
def pay():
    for e in employees:
        pay_if_necessary(e)

def pay_if_necessary(emp):
    if emp.is_payday():
        calculate_and_deliver_pay(emp)

def calculate_and_deliver_pay(emp):
    pay = emp.calculate_pay()
    emp.deliver_pay(pay)