How to use the parsedatetime.pdtLocales function in parsedatetime

def tearDown(self):
        if self.__old_pdtlocale_fr is not None:  # restore the locale
            pdt.pdtLocales['fr_FR'] = self.__old_pdtlocale_fr
        super(TestDayOffsets, self).tearDown()

def setUp(self):
        pdt.pdtLocales['en_us'] = pdtLocale_en  # override for the test
        self.ptc = pdt.Constants('en_us', usePyICU=False)
        self.cal = pdt.Calendar(self.ptc)
        (self.yr, self.mth, self.dy, self.hr,
         self.mn, self.sec, self.wd, self.yd, self.isdst) = time.localtime()

def setUp(self):
        super(TestDayOffsets, self).setUp()
        self.__old_pdtlocale_fr = pdt.pdtLocales.get('fr_FR')  # save for later
        pdt.pdtLocales['fr_FR'] = pdtLocale_fr  # override for the test
        self.ptc = pdt.Constants('fr_FR', usePyICU=False)
        self.cal = pdt.Calendar(self.ptc)

import datetime
import parsedatetime as pdt
from dateutil.relativedelta import relativedelta
from .formats import plural, human_join
from discord.ext import commands
import re

# Monkey patch mins and secs into the units
units = pdt.pdtLocales['en_US'].units
units['minutes'].append('mins')
units['seconds'].append('secs')

class ShortTime:
    compiled = re.compile("""(?:(?P[0-9])(?:years?|y))?             # e.g. 2y
                             (?:(?P[0-9]{1,2})(?:months?|mo))?     # e.g. 2months
                             (?:(?P[0-9]{1,4})(?:weeks?|w))?        # e.g. 10w
                             (?:(?P[0-9]{1,5})(?:days?|d))?          # e.g. 14d
                             (?:(?P[0-9]{1,5})(?:hours?|h))?        # e.g. 12h
                             (?:(?P[0-9]{1,5})(?:minutes?|m))?    # e.g. 10m
                             (?:(?P[0-9]{1,5})(?:seconds?|s))?    # e.g. 15s
                          """, re.VERBOSE)

    def __init__(self, argument, *, now=None):
        match = self.compiled.fullmatch(argument)
        if match is None or not match.group(0):