rent.py

import inspect

#: Annual percentage rate of your savings account, certificate of deposit, etc.
APR = 0.032
TAX_RATE = 0.154


class Terms:
    def __init__(self, deposit, rent, utilities, commute_time, commute_cost):
        frame = inspect.currentframe()
        args, _, _, values = inspect.getargvalues(frame)

        for key in args[1:]:
            setattr(self, key, float(values[key]))

    @property
    def values(self):
        return self.deposit, self.rent, self.utilities, self.commute_time, \
            self.commute_cost


def annual_costs(deposit, rent, utilities, commute_time, commute_cost):
    """Calculate the annual cost of renting a premises.

    :param deposit: Fully refundable deposit
    :param rent: Monthly rent
    :param utilities: Monthly utility costs
    :param commute_time: Commute time in minutes (one way)
    :param commute_cost: Commute cost in minutes (one way)
    """

    oppt_cost = deposit * APR * (1 - TAX_RATE)

    # Assuming you have a full-time job (40 hours/week) and get 15-day paid
    # vacations per year, and there are about 25 holidays per year on average.
    working_days = (52 * 5) - (15 + 25)

    costs = oppt_cost + ((rent + utilities) * 12) \
        + commute_cost * working_days * 2

    time = commute_time * working_days * 2

    return costs, time / 60.0


def compare(t1, t2):
    """Compare two different rent contracts."""

    annual_costs1 = annual_costs(*t1.values)
    annual_costs2 = annual_costs(*t2.values)

    cost_diff = annual_costs2[0] - annual_costs1[0]
    time_diff = annual_costs2[1] - annual_costs1[1]

    return cost_diff, time_diff


def make_assessment(t1, t2):
    cost_diff, time_diff = compare(t1, t2)

    print("You are spending {} to save {} hours annually.".format(
        round(cost_diff, 2), round(-time_diff, 2)))

    if time_diff >= 0:
        print("You're not saving any time at all.")
    else:
        sufficient_hourly_wage = cost_diff / -time_diff
        if sufficient_hourly_wage < 0:
            print("This is an absolute win. What are you waiting for?")
        else:
            print("Unless you are making {} per hour, don't move.".format(
                round(sufficient_hourly_wage, 2)))