--- a/env/lib/python3.7/site-packages/dateutil/tz/_common.py	Thu May 14 16:47:39 2020 -0400
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,419 +0,0 @@
-from six import PY2
-
-from functools import wraps
-
-from datetime import datetime, timedelta, tzinfo
-
-
-ZERO = timedelta(0)
-
-__all__ = ['tzname_in_python2', 'enfold']
-
-
-def tzname_in_python2(namefunc):
-    """Change unicode output into bytestrings in Python 2
-
-    tzname() API changed in Python 3. It used to return bytes, but was changed
-    to unicode strings
-    """
-    if PY2:
-        @wraps(namefunc)
-        def adjust_encoding(*args, **kwargs):
-            name = namefunc(*args, **kwargs)
-            if name is not None:
-                name = name.encode()
-
-            return name
-
-        return adjust_encoding
-    else:
-        return namefunc
-
-
-# The following is adapted from Alexander Belopolsky's tz library
-# https://github.com/abalkin/tz
-if hasattr(datetime, 'fold'):
-    # This is the pre-python 3.6 fold situation
-    def enfold(dt, fold=1):
-        """
-        Provides a unified interface for assigning the ``fold`` attribute to
-        datetimes both before and after the implementation of PEP-495.
-
-        :param fold:
-            The value for the ``fold`` attribute in the returned datetime. This
-            should be either 0 or 1.
-
-        :return:
-            Returns an object for which ``getattr(dt, 'fold', 0)`` returns
-            ``fold`` for all versions of Python. In versions prior to
-            Python 3.6, this is a ``_DatetimeWithFold`` object, which is a
-            subclass of :py:class:`datetime.datetime` with the ``fold``
-            attribute added, if ``fold`` is 1.
-
-        .. versionadded:: 2.6.0
-        """
-        return dt.replace(fold=fold)
-
-else:
-    class _DatetimeWithFold(datetime):
-        """
-        This is a class designed to provide a PEP 495-compliant interface for
-        Python versions before 3.6. It is used only for dates in a fold, so
-        the ``fold`` attribute is fixed at ``1``.
-
-        .. versionadded:: 2.6.0
-        """
-        __slots__ = ()
-
-        def replace(self, *args, **kwargs):
-            """
-            Return a datetime with the same attributes, except for those
-            attributes given new values by whichever keyword arguments are
-            specified. Note that tzinfo=None can be specified to create a naive
-            datetime from an aware datetime with no conversion of date and time
-            data.
-
-            This is reimplemented in ``_DatetimeWithFold`` because pypy3 will
-            return a ``datetime.datetime`` even if ``fold`` is unchanged.
-            """
-            argnames = (
-                'year', 'month', 'day', 'hour', 'minute', 'second',
-                'microsecond', 'tzinfo'
-            )
-
-            for arg, argname in zip(args, argnames):
-                if argname in kwargs:
-                    raise TypeError('Duplicate argument: {}'.format(argname))
-
-                kwargs[argname] = arg
-
-            for argname in argnames:
-                if argname not in kwargs:
-                    kwargs[argname] = getattr(self, argname)
-
-            dt_class = self.__class__ if kwargs.get('fold', 1) else datetime
-
-            return dt_class(**kwargs)
-
-        @property
-        def fold(self):
-            return 1
-
-    def enfold(dt, fold=1):
-        """
-        Provides a unified interface for assigning the ``fold`` attribute to
-        datetimes both before and after the implementation of PEP-495.
-
-        :param fold:
-            The value for the ``fold`` attribute in the returned datetime. This
-            should be either 0 or 1.
-
-        :return:
-            Returns an object for which ``getattr(dt, 'fold', 0)`` returns
-            ``fold`` for all versions of Python. In versions prior to
-            Python 3.6, this is a ``_DatetimeWithFold`` object, which is a
-            subclass of :py:class:`datetime.datetime` with the ``fold``
-            attribute added, if ``fold`` is 1.
-
-        .. versionadded:: 2.6.0
-        """
-        if getattr(dt, 'fold', 0) == fold:
-            return dt
-
-        args = dt.timetuple()[:6]
-        args += (dt.microsecond, dt.tzinfo)
-
-        if fold:
-            return _DatetimeWithFold(*args)
-        else:
-            return datetime(*args)
-
-
-def _validate_fromutc_inputs(f):
-    """
-    The CPython version of ``fromutc`` checks that the input is a ``datetime``
-    object and that ``self`` is attached as its ``tzinfo``.
-    """
-    @wraps(f)
-    def fromutc(self, dt):
-        if not isinstance(dt, datetime):
-            raise TypeError("fromutc() requires a datetime argument")
-        if dt.tzinfo is not self:
-            raise ValueError("dt.tzinfo is not self")
-
-        return f(self, dt)
-
-    return fromutc
-
-
-class _tzinfo(tzinfo):
-    """
-    Base class for all ``dateutil`` ``tzinfo`` objects.
-    """
-
-    def is_ambiguous(self, dt):
-        """
-        Whether or not the "wall time" of a given datetime is ambiguous in this
-        zone.
-
-        :param dt:
-            A :py:class:`datetime.datetime`, naive or time zone aware.
-
-
-        :return:
-            Returns ``True`` if ambiguous, ``False`` otherwise.
-
-        .. versionadded:: 2.6.0
-        """
-
-        dt = dt.replace(tzinfo=self)
-
-        wall_0 = enfold(dt, fold=0)
-        wall_1 = enfold(dt, fold=1)
-
-        same_offset = wall_0.utcoffset() == wall_1.utcoffset()
-        same_dt = wall_0.replace(tzinfo=None) == wall_1.replace(tzinfo=None)
-
-        return same_dt and not same_offset
-
-    def _fold_status(self, dt_utc, dt_wall):
-        """
-        Determine the fold status of a "wall" datetime, given a representation
-        of the same datetime as a (naive) UTC datetime. This is calculated based
-        on the assumption that ``dt.utcoffset() - dt.dst()`` is constant for all
-        datetimes, and that this offset is the actual number of hours separating
-        ``dt_utc`` and ``dt_wall``.
-
-        :param dt_utc:
-            Representation of the datetime as UTC
-
-        :param dt_wall:
-            Representation of the datetime as "wall time". This parameter must
-            either have a `fold` attribute or have a fold-naive
-            :class:`datetime.tzinfo` attached, otherwise the calculation may
-            fail.
-        """
-        if self.is_ambiguous(dt_wall):
-            delta_wall = dt_wall - dt_utc
-            _fold = int(delta_wall == (dt_utc.utcoffset() - dt_utc.dst()))
-        else:
-            _fold = 0
-
-        return _fold
-
-    def _fold(self, dt):
-        return getattr(dt, 'fold', 0)
-
-    def _fromutc(self, dt):
-        """
-        Given a timezone-aware datetime in a given timezone, calculates a
-        timezone-aware datetime in a new timezone.
-
-        Since this is the one time that we *know* we have an unambiguous
-        datetime object, we take this opportunity to determine whether the
-        datetime is ambiguous and in a "fold" state (e.g. if it's the first
-        occurrence, chronologically, of the ambiguous datetime).
-
-        :param dt:
-            A timezone-aware :class:`datetime.datetime` object.
-        """
-
-        # Re-implement the algorithm from Python's datetime.py
-        dtoff = dt.utcoffset()
-        if dtoff is None:
-            raise ValueError("fromutc() requires a non-None utcoffset() "
-                             "result")
-
-        # The original datetime.py code assumes that `dst()` defaults to
-        # zero during ambiguous times. PEP 495 inverts this presumption, so
-        # for pre-PEP 495 versions of python, we need to tweak the algorithm.
-        dtdst = dt.dst()
-        if dtdst is None:
-            raise ValueError("fromutc() requires a non-None dst() result")
-        delta = dtoff - dtdst
-
-        dt += delta
-        # Set fold=1 so we can default to being in the fold for
-        # ambiguous dates.
-        dtdst = enfold(dt, fold=1).dst()
-        if dtdst is None:
-            raise ValueError("fromutc(): dt.dst gave inconsistent "
-                             "results; cannot convert")
-        return dt + dtdst
-
-    @_validate_fromutc_inputs
-    def fromutc(self, dt):
-        """
-        Given a timezone-aware datetime in a given timezone, calculates a
-        timezone-aware datetime in a new timezone.
-
-        Since this is the one time that we *know* we have an unambiguous
-        datetime object, we take this opportunity to determine whether the
-        datetime is ambiguous and in a "fold" state (e.g. if it's the first
-        occurrence, chronologically, of the ambiguous datetime).
-
-        :param dt:
-            A timezone-aware :class:`datetime.datetime` object.
-        """
-        dt_wall = self._fromutc(dt)
-
-        # Calculate the fold status given the two datetimes.
-        _fold = self._fold_status(dt, dt_wall)
-
-        # Set the default fold value for ambiguous dates
-        return enfold(dt_wall, fold=_fold)
-
-
-class tzrangebase(_tzinfo):
-    """
-    This is an abstract base class for time zones represented by an annual
-    transition into and out of DST. Child classes should implement the following
-    methods:
-
-        * ``__init__(self, *args, **kwargs)``
-        * ``transitions(self, year)`` - this is expected to return a tuple of
-          datetimes representing the DST on and off transitions in standard
-          time.
-
-    A fully initialized ``tzrangebase`` subclass should also provide the
-    following attributes:
-        * ``hasdst``: Boolean whether or not the zone uses DST.
-        * ``_dst_offset`` / ``_std_offset``: :class:`datetime.timedelta` objects
-          representing the respective UTC offsets.
-        * ``_dst_abbr`` / ``_std_abbr``: Strings representing the timezone short
-          abbreviations in DST and STD, respectively.
-        * ``_hasdst``: Whether or not the zone has DST.
-
-    .. versionadded:: 2.6.0
-    """
-    def __init__(self):
-        raise NotImplementedError('tzrangebase is an abstract base class')
-
-    def utcoffset(self, dt):
-        isdst = self._isdst(dt)
-
-        if isdst is None:
-            return None
-        elif isdst:
-            return self._dst_offset
-        else:
-            return self._std_offset
-
-    def dst(self, dt):
-        isdst = self._isdst(dt)
-
-        if isdst is None:
-            return None
-        elif isdst:
-            return self._dst_base_offset
-        else:
-            return ZERO
-
-    @tzname_in_python2
-    def tzname(self, dt):
-        if self._isdst(dt):
-            return self._dst_abbr
-        else:
-            return self._std_abbr
-
-    def fromutc(self, dt):
-        """ Given a datetime in UTC, return local time """
-        if not isinstance(dt, datetime):
-            raise TypeError("fromutc() requires a datetime argument")
-
-        if dt.tzinfo is not self:
-            raise ValueError("dt.tzinfo is not self")
-
-        # Get transitions - if there are none, fixed offset
-        transitions = self.transitions(dt.year)
-        if transitions is None:
-            return dt + self.utcoffset(dt)
-
-        # Get the transition times in UTC
-        dston, dstoff = transitions
-
-        dston -= self._std_offset
-        dstoff -= self._std_offset
-
-        utc_transitions = (dston, dstoff)
-        dt_utc = dt.replace(tzinfo=None)
-
-        isdst = self._naive_isdst(dt_utc, utc_transitions)
-
-        if isdst:
-            dt_wall = dt + self._dst_offset
-        else:
-            dt_wall = dt + self._std_offset
-
-        _fold = int(not isdst and self.is_ambiguous(dt_wall))
-
-        return enfold(dt_wall, fold=_fold)
-
-    def is_ambiguous(self, dt):
-        """
-        Whether or not the "wall time" of a given datetime is ambiguous in this
-        zone.
-
-        :param dt:
-            A :py:class:`datetime.datetime`, naive or time zone aware.
-
-
-        :return:
-            Returns ``True`` if ambiguous, ``False`` otherwise.
-
-        .. versionadded:: 2.6.0
-        """
-        if not self.hasdst:
-            return False
-
-        start, end = self.transitions(dt.year)
-
-        dt = dt.replace(tzinfo=None)
-        return (end <= dt < end + self._dst_base_offset)
-
-    def _isdst(self, dt):
-        if not self.hasdst:
-            return False
-        elif dt is None:
-            return None
-
-        transitions = self.transitions(dt.year)
-
-        if transitions is None:
-            return False
-
-        dt = dt.replace(tzinfo=None)
-
-        isdst = self._naive_isdst(dt, transitions)
-
-        # Handle ambiguous dates
-        if not isdst and self.is_ambiguous(dt):
-            return not self._fold(dt)
-        else:
-            return isdst
-
-    def _naive_isdst(self, dt, transitions):
-        dston, dstoff = transitions
-
-        dt = dt.replace(tzinfo=None)
-
-        if dston < dstoff:
-            isdst = dston <= dt < dstoff
-        else:
-            isdst = not dstoff <= dt < dston
-
-        return isdst
-
-    @property
-    def _dst_base_offset(self):
-        return self._dst_offset - self._std_offset
-
-    __hash__ = None
-
-    def __ne__(self, other):
-        return not (self == other)
-
-    def __repr__(self):
-        return "%s(...)" % self.__class__.__name__
-
-    __reduce__ = object.__reduce__