--- a/env/lib/python3.7/site-packages/packaging/version.py	Thu May 14 16:47:39 2020 -0400
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,535 +0,0 @@
-# This file is dual licensed under the terms of the Apache License, Version
-# 2.0, and the BSD License. See the LICENSE file in the root of this repository
-# for complete details.
-from __future__ import absolute_import, division, print_function
-
-import collections
-import itertools
-import re
-
-from ._structures import Infinity, NegativeInfinity
-from ._typing import MYPY_CHECK_RUNNING
-
-if MYPY_CHECK_RUNNING:  # pragma: no cover
-    from typing import Callable, Iterator, List, Optional, SupportsInt, Tuple, Union
-
-    from ._structures import InfinityType, NegativeInfinityType
-
-    InfiniteTypes = Union[InfinityType, NegativeInfinityType]
-    PrePostDevType = Union[InfiniteTypes, Tuple[str, int]]
-    SubLocalType = Union[InfiniteTypes, int, str]
-    LocalType = Union[
-        NegativeInfinityType,
-        Tuple[
-            Union[
-                SubLocalType,
-                Tuple[SubLocalType, str],
-                Tuple[NegativeInfinityType, SubLocalType],
-            ],
-            ...,
-        ],
-    ]
-    CmpKey = Tuple[
-        int, Tuple[int, ...], PrePostDevType, PrePostDevType, PrePostDevType, LocalType
-    ]
-    LegacyCmpKey = Tuple[int, Tuple[str, ...]]
-    VersionComparisonMethod = Callable[
-        [Union[CmpKey, LegacyCmpKey], Union[CmpKey, LegacyCmpKey]], bool
-    ]
-
-__all__ = ["parse", "Version", "LegacyVersion", "InvalidVersion", "VERSION_PATTERN"]
-
-
-_Version = collections.namedtuple(
-    "_Version", ["epoch", "release", "dev", "pre", "post", "local"]
-)
-
-
-def parse(version):
-    # type: (str) -> Union[LegacyVersion, Version]
-    """
-    Parse the given version string and return either a :class:`Version` object
-    or a :class:`LegacyVersion` object depending on if the given version is
-    a valid PEP 440 version or a legacy version.
-    """
-    try:
-        return Version(version)
-    except InvalidVersion:
-        return LegacyVersion(version)
-
-
-class InvalidVersion(ValueError):
-    """
-    An invalid version was found, users should refer to PEP 440.
-    """
-
-
-class _BaseVersion(object):
-    _key = None  # type: Union[CmpKey, LegacyCmpKey]
-
-    def __hash__(self):
-        # type: () -> int
-        return hash(self._key)
-
-    def __lt__(self, other):
-        # type: (_BaseVersion) -> bool
-        return self._compare(other, lambda s, o: s < o)
-
-    def __le__(self, other):
-        # type: (_BaseVersion) -> bool
-        return self._compare(other, lambda s, o: s <= o)
-
-    def __eq__(self, other):
-        # type: (object) -> bool
-        return self._compare(other, lambda s, o: s == o)
-
-    def __ge__(self, other):
-        # type: (_BaseVersion) -> bool
-        return self._compare(other, lambda s, o: s >= o)
-
-    def __gt__(self, other):
-        # type: (_BaseVersion) -> bool
-        return self._compare(other, lambda s, o: s > o)
-
-    def __ne__(self, other):
-        # type: (object) -> bool
-        return self._compare(other, lambda s, o: s != o)
-
-    def _compare(self, other, method):
-        # type: (object, VersionComparisonMethod) -> Union[bool, NotImplemented]
-        if not isinstance(other, _BaseVersion):
-            return NotImplemented
-
-        return method(self._key, other._key)
-
-
-class LegacyVersion(_BaseVersion):
-    def __init__(self, version):
-        # type: (str) -> None
-        self._version = str(version)
-        self._key = _legacy_cmpkey(self._version)
-
-    def __str__(self):
-        # type: () -> str
-        return self._version
-
-    def __repr__(self):
-        # type: () -> str
-        return "<LegacyVersion({0})>".format(repr(str(self)))
-
-    @property
-    def public(self):
-        # type: () -> str
-        return self._version
-
-    @property
-    def base_version(self):
-        # type: () -> str
-        return self._version
-
-    @property
-    def epoch(self):
-        # type: () -> int
-        return -1
-
-    @property
-    def release(self):
-        # type: () -> None
-        return None
-
-    @property
-    def pre(self):
-        # type: () -> None
-        return None
-
-    @property
-    def post(self):
-        # type: () -> None
-        return None
-
-    @property
-    def dev(self):
-        # type: () -> None
-        return None
-
-    @property
-    def local(self):
-        # type: () -> None
-        return None
-
-    @property
-    def is_prerelease(self):
-        # type: () -> bool
-        return False
-
-    @property
-    def is_postrelease(self):
-        # type: () -> bool
-        return False
-
-    @property
-    def is_devrelease(self):
-        # type: () -> bool
-        return False
-
-
-_legacy_version_component_re = re.compile(r"(\d+ | [a-z]+ | \.| -)", re.VERBOSE)
-
-_legacy_version_replacement_map = {
-    "pre": "c",
-    "preview": "c",
-    "-": "final-",
-    "rc": "c",
-    "dev": "@",
-}
-
-
-def _parse_version_parts(s):
-    # type: (str) -> Iterator[str]
-    for part in _legacy_version_component_re.split(s):
-        part = _legacy_version_replacement_map.get(part, part)
-
-        if not part or part == ".":
-            continue
-
-        if part[:1] in "0123456789":
-            # pad for numeric comparison
-            yield part.zfill(8)
-        else:
-            yield "*" + part
-
-    # ensure that alpha/beta/candidate are before final
-    yield "*final"
-
-
-def _legacy_cmpkey(version):
-    # type: (str) -> LegacyCmpKey
-
-    # We hardcode an epoch of -1 here. A PEP 440 version can only have a epoch
-    # greater than or equal to 0. This will effectively put the LegacyVersion,
-    # which uses the defacto standard originally implemented by setuptools,
-    # as before all PEP 440 versions.
-    epoch = -1
-
-    # This scheme is taken from pkg_resources.parse_version setuptools prior to
-    # it's adoption of the packaging library.
-    parts = []  # type: List[str]
-    for part in _parse_version_parts(version.lower()):
-        if part.startswith("*"):
-            # remove "-" before a prerelease tag
-            if part < "*final":
-                while parts and parts[-1] == "*final-":
-                    parts.pop()
-
-            # remove trailing zeros from each series of numeric parts
-            while parts and parts[-1] == "00000000":
-                parts.pop()
-
-        parts.append(part)
-
-    return epoch, tuple(parts)
-
-
-# Deliberately not anchored to the start and end of the string, to make it
-# easier for 3rd party code to reuse
-VERSION_PATTERN = r"""
-    v?
-    (?:
-        (?:(?P<epoch>[0-9]+)!)?                           # epoch
-        (?P<release>[0-9]+(?:\.[0-9]+)*)                  # release segment
-        (?P<pre>                                          # pre-release
-            [-_\.]?
-            (?P<pre_l>(a|b|c|rc|alpha|beta|pre|preview))
-            [-_\.]?
-            (?P<pre_n>[0-9]+)?
-        )?
-        (?P<post>                                         # post release
-            (?:-(?P<post_n1>[0-9]+))
-            |
-            (?:
-                [-_\.]?
-                (?P<post_l>post|rev|r)
-                [-_\.]?
-                (?P<post_n2>[0-9]+)?
-            )
-        )?
-        (?P<dev>                                          # dev release
-            [-_\.]?
-            (?P<dev_l>dev)
-            [-_\.]?
-            (?P<dev_n>[0-9]+)?
-        )?
-    )
-    (?:\+(?P<local>[a-z0-9]+(?:[-_\.][a-z0-9]+)*))?       # local version
-"""
-
-
-class Version(_BaseVersion):
-
-    _regex = re.compile(r"^\s*" + VERSION_PATTERN + r"\s*$", re.VERBOSE | re.IGNORECASE)
-
-    def __init__(self, version):
-        # type: (str) -> None
-
-        # Validate the version and parse it into pieces
-        match = self._regex.search(version)
-        if not match:
-            raise InvalidVersion("Invalid version: '{0}'".format(version))
-
-        # Store the parsed out pieces of the version
-        self._version = _Version(
-            epoch=int(match.group("epoch")) if match.group("epoch") else 0,
-            release=tuple(int(i) for i in match.group("release").split(".")),
-            pre=_parse_letter_version(match.group("pre_l"), match.group("pre_n")),
-            post=_parse_letter_version(
-                match.group("post_l"), match.group("post_n1") or match.group("post_n2")
-            ),
-            dev=_parse_letter_version(match.group("dev_l"), match.group("dev_n")),
-            local=_parse_local_version(match.group("local")),
-        )
-
-        # Generate a key which will be used for sorting
-        self._key = _cmpkey(
-            self._version.epoch,
-            self._version.release,
-            self._version.pre,
-            self._version.post,
-            self._version.dev,
-            self._version.local,
-        )
-
-    def __repr__(self):
-        # type: () -> str
-        return "<Version({0})>".format(repr(str(self)))
-
-    def __str__(self):
-        # type: () -> str
-        parts = []
-
-        # Epoch
-        if self.epoch != 0:
-            parts.append("{0}!".format(self.epoch))
-
-        # Release segment
-        parts.append(".".join(str(x) for x in self.release))
-
-        # Pre-release
-        if self.pre is not None:
-            parts.append("".join(str(x) for x in self.pre))
-
-        # Post-release
-        if self.post is not None:
-            parts.append(".post{0}".format(self.post))
-
-        # Development release
-        if self.dev is not None:
-            parts.append(".dev{0}".format(self.dev))
-
-        # Local version segment
-        if self.local is not None:
-            parts.append("+{0}".format(self.local))
-
-        return "".join(parts)
-
-    @property
-    def epoch(self):
-        # type: () -> int
-        _epoch = self._version.epoch  # type: int
-        return _epoch
-
-    @property
-    def release(self):
-        # type: () -> Tuple[int, ...]
-        _release = self._version.release  # type: Tuple[int, ...]
-        return _release
-
-    @property
-    def pre(self):
-        # type: () -> Optional[Tuple[str, int]]
-        _pre = self._version.pre  # type: Optional[Tuple[str, int]]
-        return _pre
-
-    @property
-    def post(self):
-        # type: () -> Optional[Tuple[str, int]]
-        return self._version.post[1] if self._version.post else None
-
-    @property
-    def dev(self):
-        # type: () -> Optional[Tuple[str, int]]
-        return self._version.dev[1] if self._version.dev else None
-
-    @property
-    def local(self):
-        # type: () -> Optional[str]
-        if self._version.local:
-            return ".".join(str(x) for x in self._version.local)
-        else:
-            return None
-
-    @property
-    def public(self):
-        # type: () -> str
-        return str(self).split("+", 1)[0]
-
-    @property
-    def base_version(self):
-        # type: () -> str
-        parts = []
-
-        # Epoch
-        if self.epoch != 0:
-            parts.append("{0}!".format(self.epoch))
-
-        # Release segment
-        parts.append(".".join(str(x) for x in self.release))
-
-        return "".join(parts)
-
-    @property
-    def is_prerelease(self):
-        # type: () -> bool
-        return self.dev is not None or self.pre is not None
-
-    @property
-    def is_postrelease(self):
-        # type: () -> bool
-        return self.post is not None
-
-    @property
-    def is_devrelease(self):
-        # type: () -> bool
-        return self.dev is not None
-
-    @property
-    def major(self):
-        # type: () -> int
-        return self.release[0] if len(self.release) >= 1 else 0
-
-    @property
-    def minor(self):
-        # type: () -> int
-        return self.release[1] if len(self.release) >= 2 else 0
-
-    @property
-    def micro(self):
-        # type: () -> int
-        return self.release[2] if len(self.release) >= 3 else 0
-
-
-def _parse_letter_version(
-    letter,  # type: str
-    number,  # type: Union[str, bytes, SupportsInt]
-):
-    # type: (...) -> Optional[Tuple[str, int]]
-
-    if letter:
-        # We consider there to be an implicit 0 in a pre-release if there is
-        # not a numeral associated with it.
-        if number is None:
-            number = 0
-
-        # We normalize any letters to their lower case form
-        letter = letter.lower()
-
-        # We consider some words to be alternate spellings of other words and
-        # in those cases we want to normalize the spellings to our preferred
-        # spelling.
-        if letter == "alpha":
-            letter = "a"
-        elif letter == "beta":
-            letter = "b"
-        elif letter in ["c", "pre", "preview"]:
-            letter = "rc"
-        elif letter in ["rev", "r"]:
-            letter = "post"
-
-        return letter, int(number)
-    if not letter and number:
-        # We assume if we are given a number, but we are not given a letter
-        # then this is using the implicit post release syntax (e.g. 1.0-1)
-        letter = "post"
-
-        return letter, int(number)
-
-    return None
-
-
-_local_version_separators = re.compile(r"[\._-]")
-
-
-def _parse_local_version(local):
-    # type: (str) -> Optional[LocalType]
-    """
-    Takes a string like abc.1.twelve and turns it into ("abc", 1, "twelve").
-    """
-    if local is not None:
-        return tuple(
-            part.lower() if not part.isdigit() else int(part)
-            for part in _local_version_separators.split(local)
-        )
-    return None
-
-
-def _cmpkey(
-    epoch,  # type: int
-    release,  # type: Tuple[int, ...]
-    pre,  # type: Optional[Tuple[str, int]]
-    post,  # type: Optional[Tuple[str, int]]
-    dev,  # type: Optional[Tuple[str, int]]
-    local,  # type: Optional[Tuple[SubLocalType]]
-):
-    # type: (...) -> CmpKey
-
-    # When we compare a release version, we want to compare it with all of the
-    # trailing zeros removed. So we'll use a reverse the list, drop all the now
-    # leading zeros until we come to something non zero, then take the rest
-    # re-reverse it back into the correct order and make it a tuple and use
-    # that for our sorting key.
-    _release = tuple(
-        reversed(list(itertools.dropwhile(lambda x: x == 0, reversed(release))))
-    )
-
-    # We need to "trick" the sorting algorithm to put 1.0.dev0 before 1.0a0.
-    # We'll do this by abusing the pre segment, but we _only_ want to do this
-    # if there is not a pre or a post segment. If we have one of those then
-    # the normal sorting rules will handle this case correctly.
-    if pre is None and post is None and dev is not None:
-        _pre = NegativeInfinity  # type: PrePostDevType
-    # Versions without a pre-release (except as noted above) should sort after
-    # those with one.
-    elif pre is None:
-        _pre = Infinity
-    else:
-        _pre = pre
-
-    # Versions without a post segment should sort before those with one.
-    if post is None:
-        _post = NegativeInfinity  # type: PrePostDevType
-
-    else:
-        _post = post
-
-    # Versions without a development segment should sort after those with one.
-    if dev is None:
-        _dev = Infinity  # type: PrePostDevType
-
-    else:
-        _dev = dev
-
-    if local is None:
-        # Versions without a local segment should sort before those with one.
-        _local = NegativeInfinity  # type: LocalType
-    else:
-        # Versions with a local segment need that segment parsed to implement
-        # the sorting rules in PEP440.
-        # - Alpha numeric segments sort before numeric segments
-        # - Alpha numeric segments sort lexicographically
-        # - Numeric segments sort numerically
-        # - Shorter versions sort before longer versions when the prefixes
-        #   match exactly
-        _local = tuple(
-            (i, "") if isinstance(i, int) else (NegativeInfinity, i) for i in local
-        )
-
-    return epoch, _release, _pre, _post, _dev, _local