Exemplo n.º 1
0
    def update_daily_detection_mach(self):
        logging.info("Start update_daily_detection_mach")
        self.db_dashboard.connectDB()
        self.db_attribute.connectDB()
        try:
            earliest = self.db_dashboard.get_date_of_earliest_row_of_detection()
            logging.debug("get_date_of_earliest_row_of_detection_mach %s" % earliest)
            latest_day = self.db_dashboard.get_date_of_latest_row_of_detection()
            logging.debug("get_date_of_latest_row_of_detection_mach %s" % latest_day)
            for current_day in util.date_range(earliest , latest_day):
                day = util.datetime_to_string(current_day)
                print(day)
                logging.debug("get_detection_by_day_mach:%s" % day)
                detection_list = self.db_attribute.get_detection_by_day_mach(day)
                print(detection_list)
                mach_o_count =plist_count = 0
                for detection in detection_list:
                    if  detection['type'] == 'mach-o':
                        mach_o_count = detection['num']
                        if mach_o_count!=0:
                            print mach_o_count
                    elif detection['type'] == 'plist':
                        plist_count = detection['num']

                # insert_detection
                self.db_dashboard.update_detection_by_day(day,mach_o_count,plist_count)
        except Exception as e:
            logging.exception("update_daily_detection_mach error: %s" % e)
            self.db_dashboard.close()
            self.db_pattern.close()
Exemplo n.º 2
0
    def update_new_virus(self):
        logging.info("Start update_new_virus")

        self.db_dashboard.connectDB()
        self.db_pattern.connectDB()

        try:
            latest_day = self.db_dashboard.get_date_of_latest_row()
            logging.debug("get_date_of_latest_row: %s" % latest_day)

            all_viruses = self.db_dashboard.get_all_viruses()
            logging.debug("get_all_viruses count: %s" % len(all_viruses))

            for current_day in util.date_range(latest_day + datetime.timedelta(1), self.today):
                current_viruses = self.db_pattern.get_viruses_by_day(current_day)
                logging.debug("get_viruses_by_day (%s) count: %s" % (current_day, len(current_viruses)))

                insert_viruses = [virus for virus in current_viruses if virus.lower() not in all_viruses]
                self.db_dashboard.insert_viruses_by_day(insert_viruses, current_day)
                logging.debug("insert_viruses count: %s" % len(insert_viruses))

                for virus in insert_viruses:
                    all_viruses.append(virus.lower())
                logging.debug("update all_viruses count: %s" % len(all_viruses))
        except Exception as e:
            logging.exception("update_new_virus error: %s" % e)
            self.db_dashboard.close()
            self.db_pattern.close()
Exemplo n.º 3
0
    def __read_db(self, start_date, end_date):
        db = self.__open_db()
        date_range = util.date_range(start_date, end_date)

        times = []
        open  = []
        high  = []
        low   = []
        close = []
        volume    = []
        adj_close = []
        for d in date_range:
            try:
                data = db[d.isoformat()]
            except:
                data = '0'

            if data != '0':
                data = data.split()
                times.append(d)
                open.append(float(data[0]))
                high.append(float(data[1]))
                low.append(float(data[2]))
                close.append(float(data[3]))
                volume.append(float(data[4]))
                adj_close.append(float(data[5]))

        return times, open, high, low, close, volume, adj_close
Exemplo n.º 4
0
    def update_daily_crc(self):
        logging.info("Start update_daily_crc")
        
        self.db_dashboard.connectDB()
        self.db_pattern.connectDB()

        try:
            latest_day = self.db_dashboard.get_date_of_latest_row_of_crc()
            logging.info("get_date_of_latest_row_of_crc: %s" % latest_day)

            # version_list = ["android_china", "android_global", "android_global_light",
            #                 "mobile_internal_full", "mobilegateway_global"]
            version_list = ["android_global_light","mobile_internal_full", "mobilegateway_global"]
            flag_list = ["0", "1"]

            for current_day in util.date_range(latest_day + datetime.timedelta(1), self.today):
                day = util.datetime_to_string(current_day)
                logging.info("get_crc_by_day:%s" % day)
                for j in version_list:
                    for k in flag_list:
                        crc_count = self.db_pattern.get_crc_count(day, j, k)
                        crc_added = self.db_pattern.get_crc_added_by_day(day, j, k)
                        crc_modified = self.db_pattern.get_crc_modified_by_day(day, j, k)
                        crc_dropped = self.db_pattern.get_crc_dropped_by_day(day, j, k)

                        # insert_crc
                        self.db_dashboard.insert_crc_by_day(day, j, k, crc_added, crc_modified, crc_dropped, crc_count)
                        logging.debug("insert finished, [%s] [%s] flag[%s] crc_added[%s] crc_modified[%s] "
                                      "crc_dropped[%s] crc_count[%s]"
                                      % (day, j, k, crc_added, crc_modified, crc_dropped, crc_count))
        except Exception as e:
            logging.exception("update_daily_crc error: %s" % e)
            self.db_dashboard.close()
            self.db_pattern.close()
Exemplo n.º 5
0
    def update_daily_malware_report(self):
        logging.info("Start update_daily_malware_report")

        self.db_dashboard.connectDB()
        self.db_attribute.connectDB()

        try:
            latest_day = self.db_dashboard.get_date_of_latest_daily_malware_report()
            logging.debug("get_date_of_latest_row_of_sample: %s" % latest_day)

            for current_day in util.date_range(latest_day + datetime.timedelta(1), self.today):
                day = util.datetime_to_string(current_day)
                logging.debug("get_sample_by_day:%s" % day)

                malware_apk = self.db_attribute.get_daily_malware_apk_number(day)
                malware_sample = self.db_attribute.get_daily_malware_sample_number(day)
                high_risk_apk = self.db_attribute.get_daily_high_risk_apk_number(day)
                high_risk_sample = self.db_attribute.get_daily_high_risk_sample_number(day)
                logging.info( "malware_apk =%s high_risk_apk = %s malware_sample = %s high_risk_sample = %s"
                % (malware_apk, high_risk_apk, malware_sample, high_risk_sample))
                # insert_detection
                #malware_apk, high_risk_apk, malware_sample, high_risk_sample
                self.db_dashboard.insert_daily_malware_report(day, malware_apk, high_risk_apk, malware_sample,
                                                              high_risk_sample)
        except Exception as e:
            logging.exception("update_daily_malware_report error: %s" % e)
            self.db_dashboard.close()
            self.db_attribute.close()
Exemplo n.º 6
0
 def get_weather(self, province, city, spell):
     month_list = date_range(self.start_time, self.end_time)
     for month in month_list:
         url = self.history_url % (spell, month)
         print(url)
         weather_list = get_soup(url).find(name='div',
                                           id='content').find_all(name='tr')
         # remove the first element
         del (weather_list[0])
         for weather in weather_list:
             detail = weather.find_all(name='td')
             date = detail[0].find(
                 name='a').get('href').split('.')[0].split('/')[-1]
             date = get_all(date)
             state = detail[1].get_text()
             state = get_all(state)
             temperature = detail[2].get_text()
             temperature = get_all(temperature)
             wind = detail[3].get_text()
             wind = get_all(wind)
             print(province, city, date, state, temperature, wind)
             sql = 'INSERT INTO weather_list(weather_date, province, city, spell, state, temperature, wind) ' \
                   'values (%s, %s, %s, %s, %s, %s, %s)'
             params = [
                 date, province, city, spell, state, temperature, wind
             ]
             self.mysql.insert(sql=sql, params=params)
Exemplo n.º 7
0
    def __init__(self,
                 strategy_label,
                 enter_signal,
                 exit_signal,
                 risk_cap,
                 starting_cash,
                 chart_functions,
                 chart_functions_new,
                 symbol_blacklist,
                 trading_symbols,
                 trading_start,
                 trading_end,
                 trading_type,
                 trading_commission,
                 always_plot):

        self.strategy_label     = strategy_label
        p = re.compile('(\s\s*)')
        self.enter_signal       = p.sub(' ', enter_signal)
        self.exit_signal        = p.sub(' ', exit_signal)
        self.risk_cap           = p.sub(' ', risk_cap)
        self.starting_cash      = starting_cash
        self.chart_functions    = chart_functions
        self.chart_functions_new = chart_functions_new

        self.trading_start  = util.convert_to_datetime(trading_start)
        self.trading_end    = util.convert_to_datetime(trading_end)
        symbol_start = self.trading_start - datetime.timedelta(100)

        self.trading_symbols    = sl.SymbolList(trading_symbols,
                                                symbol_blacklist,
                                                symbol_start,
                                                self.trading_end)
        self.trading_symbols_label = trading_symbols
        #self.trading_start  = datetime.strptime(trading_start, "%Y%M%d")
        #self.trading_end    = datetime.strptime(trading_end, "%Y%M%d")
        self.trading_type       = trading_type
        self.trading_commission = trading_commission
        self.always_plot        = always_plot

        self.daterange = util.date_range(self.trading_start, self.trading_end)
        print self.daterange

        # Portfolio to manage the trading transactions of the strategy
        self.portfolio = portfolio.Portfolio(self.starting_cash,
                                             self.trading_start,
                                             self.trading_commission)

        # time series used to store when we are in or out of the market
        self.in_n_out = None

        self.trading_days = None

        # dictionary with time series of computed indicators
        # time series to store the performance of the current trading strategy
        self.performance_index = {}
        self.stock_chart = {}
        self.indicators = {}
def get_holidays_between(instance, start_date, end_date):
    holidays = []

    for date in date_range(start_date, end_date, exclusive=False):
        if date in instance:
            holiday_names = instance.get(date).split(', ')
            for holiday_name in holiday_names:
                holidays.append([holiday_name, date])

    return pd.DataFrame(holidays, columns=['holiday', 'ds'])
Exemplo n.º 9
0
    def update_daily_detection(self):
        logging.info("Start update_daily_detection")

        self.db_dashboard.connectDB()
        self.db_attribute.connectDB()

        try:
            latest_day = self.db_dashboard.get_date_of_latest_row_of_detection()
            logging.debug("get_date_of_latest_row_of_detection %s" % latest_day)

            for current_day in util.date_range(latest_day + datetime.timedelta(1), self.today):
                day = util.datetime_to_string(current_day)
                logging.debug("get_detection_by_day:%s" % day)
                detection_list = self.db_attribute.get_detection_by_day(day)
                apk_count = ar_count = cod_count = deb_count = dex_count = \
                    elf_count = ipa_count = other_count = sis_count = mach_o_count =plist_count =zip_count = 0
                for detection in detection_list:
                    if detection['type'] == 'apk':
                        apk_count = detection['num']
                    elif detection['type'] == 'ar':
                        ar_count = detection['num']
                    elif detection['type'] == 'cod':
                        cod_count = detection['num']
                    elif detection['type'] == 'deb':
                        deb_count = detection['num']
                    elif detection['type'] == 'dex':
                        dex_count = detection['num']
                    elif detection['type'] == 'elf':
                        elf_count = detection['num']
                    elif detection['type'] == 'ipa':
                        ipa_count = detection['num']
                    elif detection['type'] == 'other':
                        other_count = detection['num']
                    elif detection['type'] == 'sis':
                        sis_count = detection['num']
                    elif detection['type'] == 'zip':
                        zip_count = detection['num']
                    elif detection['type'] == 'mach-o':
                        mach_o_count = detection['num']
                    elif detection['type'] == 'plist':
                        plist_count = detection['num']

                # insert_detection
                self.db_dashboard.insert_detection_by_day(day, apk_count, ar_count, cod_count, deb_count, dex_count,
                                                          elf_count, ipa_count, other_count, sis_count, zip_count,mach_o_count,plist_count)
        except Exception as e:
            logging.exception("update_daily_detection error: %s" % e)
            self.db_dashboard.close()
            self.db_pattern.close()
Exemplo n.º 10
0
def analyse(path, filter_fn, field_name, print_csv=False):
    data = load_data(path, filter_fn)
    occurrences = data['days']
    day_of_cycle = data['day_of_cycle']
    weekdays = data['weekdays']
    day_of_cycle_total = sum([day_of_cycle[x] for x in day_of_cycle])

    if len(occurrences) == 0:
        print "No tags found. Are you sure '%s' is the correct tag?" % tag
        return

    deltas = []
    for d in xrange(len(occurrences)-1):
        delta = occurrences[d+1] - occurrences[d]
        if delta.days > 2:
            deltas.append(delta.days)

    if print_csv:
        print "date,%s" % field_name
        for d in date_range(occurrences[0], occurrences[len(occurrences)-1]):
            if d in occurrences:
                print str(d) + ",1"
            else:
                print str(d) + ",0"
        return

    print "==============="
    print "Day of cycle distribution"
    previous = None
    for k in sorted(day_of_cycle.keys()):
        if previous:
            if k - previous > 1:
                print ".\n."
        previous = k
        print ("Day %s:" % k).ljust(10), str(day_of_cycle[k]).ljust(4), round(day_of_cycle[k] / float(day_of_cycle_total), 2)
    print "==============="
    print "Weekday distribution"
    for k in sorted(weekdays.keys()):
        print weekday_from_int(k).ljust(5), weekdays[k]
    print "==============="
    print "Total amount of days with %s: " % field_name, len(occurrences)
    print "Average amount of days between %s: " % field_name, average(deltas)
    print "Std dev: ", std_dev(deltas)
    print "Last day with %s: " % field_name, occurrences[len(occurrences)-1]
    print "Days between today and last day with %s: " % field_name, (datetime.datetime.today().date() - occurrences[len(occurrences)-1].date()).days
    print "==============="
Exemplo n.º 11
0
    def __init__(self, strategy_label, enter_signal, exit_signal, risk_cap,
                 starting_cash, chart_functions, chart_functions_new,
                 symbol_blacklist, trading_symbols, trading_start, trading_end,
                 trading_type, trading_commission, always_plot):

        self.strategy_label = strategy_label
        p = re.compile('(\s\s*)')
        self.enter_signal = p.sub(' ', enter_signal)
        self.exit_signal = p.sub(' ', exit_signal)
        self.risk_cap = p.sub(' ', risk_cap)
        self.starting_cash = starting_cash
        self.chart_functions = chart_functions
        self.chart_functions_new = chart_functions_new

        self.trading_start = util.convert_to_datetime(trading_start)
        self.trading_end = util.convert_to_datetime(trading_end)
        symbol_start = self.trading_start - datetime.timedelta(100)

        self.trading_symbols = sl.SymbolList(trading_symbols, symbol_blacklist,
                                             symbol_start, self.trading_end)
        self.trading_symbols_label = trading_symbols
        #self.trading_start  = datetime.strptime(trading_start, "%Y%M%d")
        #self.trading_end    = datetime.strptime(trading_end, "%Y%M%d")
        self.trading_type = trading_type
        self.trading_commission = trading_commission
        self.always_plot = always_plot

        self.daterange = util.date_range(self.trading_start, self.trading_end)
        print self.daterange

        # Portfolio to manage the trading transactions of the strategy
        self.portfolio = portfolio.Portfolio(self.starting_cash,
                                             self.trading_start,
                                             self.trading_commission)

        # time series used to store when we are in or out of the market
        self.in_n_out = None

        self.trading_days = None

        # dictionary with time series of computed indicators
        # time series to store the performance of the current trading strategy
        self.performance_index = {}
        self.stock_chart = {}
        self.indicators = {}
Exemplo n.º 12
0
	def get_x_values(self):
		x_min, x_max, scale_division = self._x_range()
		if self.timescale_divisions:
			pattern = re.compile('(\d+) ?(\w+)')
			m = pattern.match(self.timescale_divisions)
			if not m:
				raise ValueError, "Invalid timescale_divisions: %s" % self.timescale_divisions
			
			magnitude = int(m.group(1))
			units = m.group(2)
			
			parameter = self.lookup_relativedelta_parameter(units)
			
			delta = relativedelta(**{parameter:magnitude})
			
			scale_division = delta

		return date_range(x_min, x_max, scale_division)
Exemplo n.º 13
0
    def __insert_symbol(self, start_date, end_date, db):       
        list = self.__get_historical_prices(self.symbol, start_date, end_date)
        if len(list) == 1:
            return None

        last_trade_date = list[1][0]
        days_without_trade = util.date_range(start_date, last_trade_date)

        # fill dictionary with data for trading days
        for i in range(1,len(list)):
            trade_date = list[i][0]
            days_without_trade.remove(trade_date)

            data = ''
            for j in range(1, len(list[i])):
                data = data + str(list[i][j]) + ' '
            db[ trade_date.isoformat() ] = data
            
        # make the data for non-trading days '0'
        for i in days_without_trade:
            db [i.isoformat()] = '0'
Exemplo n.º 14
0
def load_data(path, filter_fn):
    with open(path) as f:
        data_sorted = sorted(json.loads(f.read())['data'], key=lambda x: x['day'])

    data = { x['day'][:10]: x for x in data_sorted }
    days = []
    day_of_cycle_dict = {}
    day_of_cycle = 0
    start_date = parse(data_sorted[0]['day'])
    end_date = parse(data_sorted[len(data_sorted)-1]['day'])
    dates = [x.date().strftime('%Y-%m-%d') for x in date_range(start_date, end_date)]
    weekdays = { x: 0 for x in xrange(0, 7) }

    for d in dates:
        try:
            i = data[d]
        except:
            if day_of_cycle != 0:
                day_of_cycle += 1
            continue
        if 'period' in i:
            if (day_of_cycle > 15 or day_of_cycle == 0) and i['period'] != 'spotting':
                day_of_cycle = 1
        if filter_fn(i):
            days.append(parse(i['day']))
            weekdays[parse(i['day']).weekday()] += 1
            if day_of_cycle != 0:
                if not day_of_cycle_dict.get(day_of_cycle):
                    day_of_cycle_dict[day_of_cycle] = 1
                else:
                    day_of_cycle_dict[day_of_cycle] += 1
        if day_of_cycle != 0:
            day_of_cycle += 1

    return {
        "days": days,
        "day_of_cycle": day_of_cycle_dict,
        "weekdays": weekdays
    }
Exemplo n.º 15
0
    def update_top10_family(self):
        logging.info("Start update_top10_family")
        
        self.db_dashboard.connectDB()
        self.db_attribute.connectDB()
        
        try:
            latest_day = self.db_dashboard.get_date_of_latest_row_of_top10_family()
            logging.debug("get_date_of_latest_row_of_top10_family: %s" % latest_day)

            for current_day in util.date_range(latest_day + datetime.timedelta(1), self.today):
                day = util.datetime_to_string(current_day)
                logging.debug("get_sample_by_day:%s" % day)

                detection_list = self.db_attribute.get_detection_list_by_day(day)
                adware_family_list = self.db_attribute.get_adware_family_list()

                malware_list = list()
                adware_list = list()
                malware_count = 0
                adware_count = 0

                for detection in detection_list:
                    adware_count += detection['num']
                    if detection['family_name'] in adware_family_list:
                        adware_list.append((detection['family_name'], detection['num']))
                    elif detection['family_name'] != 'GEN':
                        malware_list.append((detection['family_name'], detection['num']))

                # insert
                self.db_dashboard.insert_top10_family_by_day(day, "malware", malware_count, malware_list)
                self.db_dashboard.insert_top10_family_by_day(day, "adware", adware_count, adware_list)

        except Exception as e:
            logging.exception("update_top10_family error: %s" % e)
            self.db_dashboard.close()
            self.db_pattern.close()
Exemplo n.º 16
0
 def __iter__(self):
     if type(self.min_key) is int:
         return iter(xrange(self.min_key, self.max_key+1))
     elif type(self.min_key) is datetime.date:
         return util.date_range(self.min_key, self.max_key)
Exemplo n.º 17
0
    def build_r_0_arr(self):
        """Returns an array of the reproduction numbers (R) for each day.

        Each element in the array represents a single day in the simulation.
            For example, if self.first_date is 2020-03-01 and self.projection_end_date
            is 2020-09-01, then R_0_ARR[10] would be the R value on 2020-03-11.

        Full description at: https://covid19-projections.com/about/#effective-reproduction-number-r
            and https://covid19-projections.com/model-details/#modeling-the-r-value

        We use three different R values: R0, post-mitigation R, and reopen R.
            We use an inverse logistic/sigmoid function to smooth the transition between
            the three R values.
        """

        reopen_r = self.get_reopen_r()
        assert 0.5 <= self.LOCKDOWN_FATIGUE <= 1.5, self.LOCKDOWN_FATIGUE

        reopen_date_shift = self.REOPEN_DATE + datetime.timedelta(
            days=int(self.REOPEN_SHIFT_DAYS) + DEFAULT_REOPEN_SHIFT_DAYS)
        fatigue_idx = self.inflection_day_idx + DAYS_UNTIL_LOCKDOWN_FATIGUE
        reopen_idx = self.get_day_idx_from_date(reopen_date_shift)
        lockdown_reopen_midpoint_idx = (self.inflection_day_idx +
                                        reopen_idx) // 2

        NUMERATOR_CONST = 6
        days_until_post_reopen = int(
            np.rint(NUMERATOR_CONST / self.REOPEN_INFLECTION))
        assert 10 <= days_until_post_reopen <= 80, days_until_post_reopen
        post_reopen_midpoint_idx = reopen_idx + days_until_post_reopen
        post_reopen_idx = reopen_idx + days_until_post_reopen * 2
        fall_start_idx = self.get_day_idx_from_date(FALL_START_DATE_NORTH) - 30

        sig_lockdown = get_transition_sigmoid(
            self.inflection_day_idx,
            self.rate_of_inflection,
            self.INITIAL_R_0,
            self.LOCKDOWN_R_0,
        )
        sig_fatigue = get_transition_sigmoid(fatigue_idx,
                                             0.2,
                                             0,
                                             self.LOCKDOWN_FATIGUE - 1,
                                             check_values=False)
        sig_reopen = get_transition_sigmoid(
            reopen_idx,
            self.REOPEN_INFLECTION,
            self.LOCKDOWN_R_0 * self.LOCKDOWN_FATIGUE,
            reopen_r,
        )
        sig_post_reopen = get_transition_sigmoid(
            post_reopen_idx,
            self.REOPEN_INFLECTION,
            reopen_r,
            min(reopen_r, self.post_reopen_equilibrium_r),
        )

        dates = util.date_range(self.first_date, self.projection_end_date)
        assert len(dates) == self.N

        R_0_ARR = [self.INITIAL_R_0]
        for day_idx in range(1, self.N):
            if day_idx < lockdown_reopen_midpoint_idx:
                r_t = sig_lockdown(day_idx)
                if abs(self.LOCKDOWN_FATIGUE - 1) > 1e-9:
                    r_t *= 1 + sig_fatigue(day_idx)
            elif day_idx > post_reopen_midpoint_idx:
                r_t = sig_post_reopen(day_idx)
            else:
                r_t = sig_reopen(day_idx)

            if day_idx > fall_start_idx:
                fall_r_mult = max(
                    0.9,
                    min(1.5,
                        self.fall_r_multiplier**(day_idx - fall_start_idx)))
                assert 0.9 <= fall_r_mult <= 1.5, fall_r_mult
                r_t *= fall_r_mult

            # Make sure R is stable
            # if day_idx > reopen_idx and abs(r_t / R_0_ARR[-1] - 1) > 0.2:
            #     assert (
            #         False
            #     ), f"{str(self)} - R changed too quickly: {day_idx} {R_0_ARR[-1]} -> {r_t} {R_0_ARR}"

            R_0_ARR.append(r_t)

        assert len(R_0_ARR) == self.N
        self.reopen_idx = reopen_idx

        return R_0_ARR
Exemplo n.º 18
0
def test_date_range(date_cls):
    assert list(date_range(date_cls(2019, 1, 1), date_cls(2019, 1, 1))) == []
    assert list(date_range(date_cls(2019, 1, 2), date_cls(2019, 1, 1))) == []
    assert list(
        date_range(date_cls(2019, 1, 1), date_cls(2019, 1, 1),
                   relativedelta(months=1))) == []
    assert list(
        date_range(date_cls(2019, 1, 1),
                   date_cls(2019, 1, 1),
                   timedelta(days=-1),
                   asc=False)) == []
    assert list(
        date_range(date_cls(2019, 1, 1),
                   date_cls(2019, 1, 2),
                   timedelta(days=-1),
                   asc=False)) == []
    assert list(
        date_range(date_cls(2019, 1, 1),
                   date_cls(2019, 1, 1),
                   relativedelta(months=-1),
                   asc=False)) == []

    assert list(date_range(date_cls(2019, 1, 31), date_cls(
        2019, 2, 2))) == [date_cls(2019, 1, 31),
                          date_cls(2019, 2, 1)]
    assert list(
        date_range(date_cls(2019, 1, 31), date_cls(2019, 2, 2),
                   timedelta(days=2))) == [date_cls(2019, 1, 31)]
    assert list(
        date_range(
            date_cls(2019, 2, 1),
            date_cls(2019, 1, 30),
            timedelta(days=-1),
            asc=False)) == [date_cls(2019, 2, 1),
                            date_cls(2019, 1, 31)]
    assert list(
        date_range(date_cls(2019, 2, 2),
                   date_cls(2019, 1, 31),
                   timedelta(days=-2),
                   asc=False)) == [date_cls(2019, 2, 2)]
    assert list(
        date_range(date_cls(2019, 1, 1), date_cls(2019, 3, 1),
                   relativedelta(months=1))) == [
                       date_cls(2019, 1, 1),
                       date_cls(2019, 2, 1)
                   ]
    assert list(
        date_range(date_cls(2019, 3, 1),
                   date_cls(2019, 1, 1),
                   relativedelta(months=-1),
                   asc=False)) == [date_cls(2019, 3, 1),
                                   date_cls(2019, 2, 1)]