fix!: Drop support for Python 2.7

pganssle · pganssle · commit c5996a5f3311 · 2020-08-19T14:09:02.000-04:00
Per the readme, Python 2.7 support was to be dropped on January 1, 2020.
This lays the groundwork for making it easier to drop the dependency on
pytz.

BREAKING CHANGE: This drops support for Python 2.7
diff --git a/CONTRIBUTING.rst b/CONTRIBUTING.rst
@@ -21,7 +21,7 @@ In order to add a feature:
 - The feature must be documented in both the API and narrative
   documentation.
 
-- The feature must work fully on the following CPython versions:  2.7,
+- The feature must work fully on the following CPython versions:
   3.5, 3.6, 3.7 and 3.8 on both UNIX and Windows.
 
 - The feature must not add unnecessary dependencies (where
@@ -69,7 +69,6 @@ We use `nox <https://nox.readthedocs.io/en/latest/>`__ to instrument our tests.
 
 - To test your changes, run unit tests with ``nox``::
 
-    $ nox -s unit-2.7
     $ nox -s unit-3.7
     $ ...
 
@@ -143,13 +142,11 @@ Running System Tests
 - To run system tests, you can execute::
 
    $ nox -s system-3.7
-   $ nox -s system-2.7
 
   .. note::
 
-      System tests are only configured to run under Python 2.7 and
-      Python 3.7. For expediency, we do not run them in older versions
-      of Python 3.
+      System tests are only configured to run under Python 3.7. For expediency,
+      we do not run them in older versions.
 
   This alone will not run the tests. You'll need to change some local
   auth settings and change some configuration in your project to
@@ -226,8 +223,6 @@ Supported versions can be found in our ``noxfile.py`` `config`_.
 
 .. _config: https://github.com/googleapis/python-api-core/blob/master/noxfile.py
 
-Python 2.7 support is deprecated. All code changes should maintain Python 2.7 compatibility until January 1, 2020.
-
 We also explicitly decided to support Python 3 beginning with version
 3.5. Reasons for this include:
 
diff --git a/README.rst b/README.rst
@@ -17,7 +17,3 @@ common helpers used by all Google API clients. For more information, see the
 Supported Python Versions
 -------------------------
 Python >= 3.5
-
-Deprecated Python Versions
---------------------------
-Python == 2.7. Python 2.7 support will be removed on January 1, 2020.
diff --git a/noxfile.py b/noxfile.py
@@ -72,13 +72,13 @@ def default(session):
         session.run(*pytest_args)
 
 
-@nox.session(python=["2.7", "3.5", "3.6", "3.7", "3.8"])
+@nox.session(python=["3.5", "3.6", "3.7", "3.8"])
 def unit(session):
     """Run the unit test suite."""
     default(session)
 
 
-@nox.session(python=["2.7", "3.5", "3.6", "3.7", "3.8"])
+@nox.session(python=["3.5", "3.6", "3.7", "3.8"])
 def unit_grpc_gcp(session):
     """Run the unit test suite with grpcio-gcp installed."""
 
@@ -108,7 +108,6 @@ def lint_setup_py(session):
     session.run("python", "setup.py", "check", "--restructuredtext", "--strict")
 
 
-# No 2.7 due to https://github.com/google/importlab/issues/26.
 # No 3.7 because pytype supports up to 3.6 only.
 @nox.session(python="3.6")
 def pytype(session):
diff --git a/setup.py b/setup.py
@@ -79,12 +79,12 @@
         "Intended Audience :: Developers",
         "License :: OSI Approved :: Apache Software License",
         "Programming Language :: Python",
-        "Programming Language :: Python :: 2",
-        "Programming Language :: Python :: 2.7",
         "Programming Language :: Python :: 3",
         "Programming Language :: Python :: 3.5",
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
+        "Programming Language :: Python :: 3.8",
+        "Programming Language :: Python :: 3.9",
         "Operating System :: OS Independent",
         "Topic :: Internet",
     ],
@@ -93,7 +93,7 @@
     namespace_packages=namespaces,
     install_requires=dependencies,
     extras_require=extras,
-    python_requires=">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*",
+    python_requires=">=3.5",
     include_package_data=True,
     zip_safe=False,
 )
