Water charge calculator for Daepyong building.

waterbill-gimhae.py

def cal(usage, homes, table):
  charge = 0

  for i, j in table:
    assert 0 < i
    assert 0 < j

    if 0 >= usage:
      break

    tmp = i * homes
    tmp = min(tmp, usage)

    charge = charge + j * tmp

    usage = usage - tmp

  return charge


BASE_CHARGE = 1100
EXTRA_CHARGE_UNIT = 170
WATER_TABLE = ((20, 550), (10, 790), (float('inf'), 1210))
# 2015
#SEWAGE_TABLE = ((10, 310), (10, 410), (10, 540), (10, 700), (float('inf'), 900))
# 2016
#SEWAGE_TABLE = ((10, 420), (10, 550), (10, 730), (10, 950), (float('inf'), 1220))
# 2017
SEWAGE_TABLE = ((10, 570), (10, 750), (10, 1000), (10, 1300), (float('inf'), 1680))

HOMES = 5
USAGE = 67

water = cal(USAGE, HOMES, WATER_TABLE)
sewage = cal(USAGE, HOMES, SEWAGE_TABLE)
extra = USAGE * EXTRA_CHARGE_UNIT
total = BASE_CHARGE + water + sewage + extra

print("base: %d" % BASE_CHARGE)
print("water: %d" % water)
print("sewage: %d" % sewage)
print("extra: %d" % extra)
print("total: %d" % total)