Luigi RangeBase implementation replacing datetime with an integer

range_integer.py

import luigi
import datetime
import itertools
import time

class RangeInteger(luigi.tools.range.RangeBase):
    """
    Instead of datetime with a specific resolution, we use a simple integer.
    The rangeBase is a bit inflexible regarding the parameter type, but we can 
    work around it by parsing it to unix timestamps back and forth. 
    """
    start = luigi.Parameter(default=1)
    stop = luigi.Parameter(default=1000)
    # Task limit usually set to stop, to enable scheduling of all parameters.
    task_limit = luigi.IntParameter(1000)

    def moving_start(self, now):
        return self.parameter_to_datetime(int(self.start))

    def moving_stop(self, now):
        return self.parameter_to_datetime(int(self.stop))

    def datetime_to_parameter(self, dt):
        return time.mktime(dt.timetuple())

    def parameter_to_datetime(self, p):
        return datetime.datetime.fromtimestamp(int(p))

    def finite_datetimes(self, finite_start, finite_stop):
        date_start = datetime.datetime(finite_start.year, finite_start.month, finite_start.day)
        dates = []
        for i in itertools.count():
            t = date_start + datetime.timedelta(seconds=i)
            if t >= finite_stop:
                return dates
            if t >= finite_start:
                dates.append(t)