def daterange(date1, date2, freq, multi, dt_format):
    start = datetime.strptime(date1, "%Y-%m-%d")
    end = datetime.strptime(date2, "%Y-%m-%d")
    while start < end:
        yield start, start + timedelta(**{freq: multi})
        start = start + timedelta(**{freq: multi})

for from_dt, to_dt in daterange('2018-01-01', '2018-02-01', 'hours', 1, "%Y-%m-%dT%H:%M:%S"):
    print("Range:",from_dt,"-",to_dt)