3 files changed, 25 insertions, 3 deletions
diff --git a/pkg_resources/_vendor/packaging/__about__.py b/pkg_resources/_vendor/packaging/__about__.py
index d5243995..eadb794e 100644
--- a/pkg_resources/_vendor/packaging/__about__.py
+++ b/pkg_resources/_vendor/packaging/__about__.py
@@ -22,7 +22,7 @@ __title__ = "packaging"
 __summary__ = "Core utilities for Python packages"
 __uri__ = "https://github.com/pypa/packaging"
 
-__version__ = "15.1"
+__version__ = "15.3"
 
 __author__ = "Donald Stufft"
 __email__ = "donald@stufft.io"
diff --git a/pkg_resources/_vendor/packaging/specifiers.py b/pkg_resources/_vendor/packaging/specifiers.py
index d5d8a956..891664f0 100644
--- a/pkg_resources/_vendor/packaging/specifiers.py
+++ b/pkg_resources/_vendor/packaging/specifiers.py
@@ -152,6 +152,14 @@ class _IndividualSpecifier(BaseSpecifier):
         return version
 
     @property
+    def operator(self):
+        return self._spec[0]
+
+    @property
+    def version(self):
+        return self._spec[1]
+
+    @property
     def prereleases(self):
         return self._prereleases
 
@@ -159,6 +167,9 @@ class _IndividualSpecifier(BaseSpecifier):
     def prereleases(self, value):
         self._prereleases = value
 
+    def __contains__(self, item):
+        return self.contains(item)
+
     def contains(self, item, prereleases=None):
         # Determine if prereleases are to be allowed or not.
         if prereleases is None:
@@ -176,7 +187,7 @@ class _IndividualSpecifier(BaseSpecifier):
 
         # Actually do the comparison to determine if this item is contained
         # within this Specifier or not.
-        return self._get_operator(self._spec[0])(item, self._spec[1])
+        return self._get_operator(self.operator)(item, self.version)
 
     def filter(self, iterable, prereleases=None):
         yielded = False
@@ -526,7 +537,7 @@ class Specifier(_IndividualSpecifier):
         # operators, and if they are if they are including an explicit
         # prerelease.
         operator, version = self._spec
-        if operator in ["==", ">=", "<=", "~="]:
+        if operator in ["==", ">=", "<=", "~=", "==="]:
             # The == specifier can include a trailing .*, if it does we
             # want to remove before parsing.
             if operator == "==" and version.endswith(".*"):
@@ -666,6 +677,12 @@ class SpecifierSet(BaseSpecifier):
 
         return self._specs != other._specs
 
+    def __len__(self):
+        return len(self._specs)
+
+    def __iter__(self):
+        return iter(self._specs)
+
     @property
     def prereleases(self):
         # If we have been given an explicit prerelease modifier, then we'll
@@ -687,6 +704,9 @@ class SpecifierSet(BaseSpecifier):
     def prereleases(self, value):
         self._prereleases = value
 
+    def __contains__(self, item):
+        return self.contains(item)
+
     def contains(self, item, prereleases=None):
         # Ensure that our item is a Version or LegacyVersion instance.
         if not isinstance(item, (LegacyVersion, Version)):
diff --git a/pkg_resources/_vendor/packaging/version.py b/pkg_resources/_vendor/packaging/version.py
index cf8afb16..4ba574b9 100644
--- a/pkg_resources/_vendor/packaging/version.py
+++ b/pkg_resources/_vendor/packaging/version.py
@@ -324,6 +324,8 @@ def _parse_letter_version(letter, number):
             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: