@@ -13,5 +13,5 @@
 # limitations under the License.
 docker:
 image: gcr.io/cloud-devrel-public-resources/owlbot-python:latest
-digest: sha256:81ed5ecdfc7cac5b699ba4537376f3563f6f04122c4ec9e735d3b3dc1d43dd32
-# created: 2022-05-05T22:08:23.383410683Z
+digest: sha256:e7bb19d47c13839fe8c147e50e02e8b6cf5da8edd1af8b82208cd6f66cc2829c
+# created: 2022-07-05T18:31:20.838186805Z

@@ -11,12 +11,10 @@ branchProtectionRules:
 # No Kokoro: the following are actions
 - 'lint'
 - 'mypy'
-- 'unit-3.6'
 - 'unit-3.7'
 - 'unit-3.8'
 - 'unit-3.9'
 - 'unit-3.10'
-- 'unit_wo_grpc-3.6'
 - 'unit_wo_grpc-3.10'
 - 'cover'
 - 'docs'

@@ -13,7 +13,6 @@ jobs:
 matrix:
 option: ["", "_wo_grpc"]
 python:
-- "3.6"
 - "3.7"
 - "3.8"
 - "3.9"

@@ -0,0 +1,7 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Only run this nox session.
+env_vars: {
+key: "NOX_SESSION"
+value: "prerelease_deps"
+}

@@ -0,0 +1,7 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Only run this nox session.
+env_vars: {
+key: "NOX_SESSION"
+value: "prerelease_deps"
+}

@@ -33,7 +33,7 @@ export PYTHONUNBUFFERED=1
 env | grep KOKORO
 
 # Install nox
-python3.6 -m pip install --upgrade --quiet nox
+python3.9 -m pip install --upgrade --quiet nox
 
 # Use secrets acessor service account to get secrets
 if [[ -f "${KOKORO_GFILE_DIR}/secrets_viewer_service_account.json" ]]; then
@@ -76,7 +76,7 @@ for file in samples/**/requirements.txt; do
 echo "------------------------------------------------------------"
 
 # Use nox to execute the tests for the project.
-python3.6 -m nox -s "$RUN_TESTS_SESSION"
+python3.9 -m nox -s "$RUN_TESTS_SESSION"
 EXIT=$?
 
 # If this is a periodic build, send the test log to the FlakyBot.

@@ -21,7 +21,7 @@ In order to add a feature:
 documentation.
 
 - The feature must work fully on the following CPython versions:
-3.6, 3.7, 3.8, 3.9, and 3.10 on both UNIX and Windows.
+3.7, 3.8, 3.9, and 3.10 on both UNIX and Windows.
 
 - The feature must not add unnecessary dependencies (where
 "unnecessary" is of course subjective, but new dependencies should
@@ -197,13 +197,11 @@ Supported Python Versions
 
 We support:
 
-- `Python 3.6`_
 - `Python 3.7`_
 - `Python 3.8`_
 - `Python 3.9`_
 - `Python 3.10`_
 
-.. _Python 3.6: https://docs.python.org/3.6/
 .. _Python 3.7: https://docs.python.org/3.7/
 .. _Python 3.8: https://docs.python.org/3.8/
 .. _Python 3.9: https://docs.python.org/3.9/
@@ -215,18 +213,6 @@ Supported versions can be found in our ``noxfile.py`` `config`_.
 .. _config: https://.com/googleapis/python-api-core/blob/main/noxfile.py
 
 
-We also explicitly decided to support Python 3 beginning with version 3.6.
-Reasons for this include:
-
-- Encouraging use of newest versions of Python 3
-- Taking the lead of `prominent`_ open-source `projects`_
-- `Unicode literal support`_ which allows for a cleaner codebase that
-works in both Python 2 and Python 3
-
-.. _prominent: https://docs.djangoproject.com/en/1.9/faq/install/#what-python-version-can-i-use-with-django
-.. _projects: http://flask.pocoo.org/docs/0.10/python3/
-.. _Unicode literal support: https://www.python.org/dev/peps/pep-0414/
-
 **********
 Versioning
 **********

@@ -16,13 +16,16 @@ common helpers used by all Google API clients. For more information, see the
 
 Supported Python Versions
 -------------------------
-Python >= 3.6
+Python >= 3.7
 
 
 Unsupported Python Versions
 ---------------------------
 
-Python == 2.7, Python == 3.5.
+Python == 2.7, Python == 3.5, Python == 3.6.
 
 The last version of this library compatible with Python 2.7 and 3.5 is
 `google-api-core==1.31.1`.
+
+The last version of this library compatible with Python 3.6 is
+`google-api-core==2.8.2`.

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-"""AsyncIO helpers for :mod:`grpc` supporting 3.6+.
+"""AsyncIO helpers for :mod:`grpc` supporting 3.7+.
 
 Please combine more detailed docstring in grpc_helpers.py to use following
 functions. This module is implementing the same surface with AsyncIO semantics.

@@ -1,4 +1,4 @@
 [mypy]
-python_version = 3.6
+python_version = 3.7
 namespace_packages = True
 ignore_missing_imports = True

@@ -43,14 +43,14 @@
 ]
 
 
-def _greater_or_equal_than_36(version_string):
+def _greater_or_equal_than_37(version_string):
 tokens = version_string.split(".")
 for i, token in enumerate(tokens):
 try:
 tokens[i] = int(token)
 except ValueError:
 pass
-return tokens >= [3, 6]
+return tokens >= [3, 7]
 
 
 @nox.session(python=DEFAULT_PYTHON_VERSION)
@@ -122,9 +122,9 @@ def default(session, install_grpc=True):
 ),
 ]
 
-# Inject AsyncIO content and proto-plus, if version >= 3.6.
+# Inject AsyncIO content and proto-plus, if version >= 3.7.
 # proto-plus is needed for a field mask test in test_protobuf_helpers.py
-if _greater_or_equal_than_36(session.python):
+if _greater_or_equal_than_37(session.python):
 session.install("asyncmock", "pytest-asyncio", "proto-plus")
 
 # Having positional arguments means the user wants to run specific tests.
@@ -136,28 +136,27 @@ def default(session, install_grpc=True):
 session.run(*pytest_args)
 
 
-@nox.session(python=["3.6", "3.7", "3.8", "3.9", "3.10"])
+@nox.session(python=["3.7", "3.8", "3.9", "3.10"])
 def unit(session):
 """Run the unit test suite."""
 default(session)
 
 
-@nox.session(python=["3.6", "3.10"])
+@nox.session(python=["3.8", "3.10"])
 def unit_wo_grpc(session):
 """Run the unit test suite w/o grpcio installed"""
 default(session, install_grpc=False)
 
 
-@nox.session(python="3.6")
+@nox.session(python="3.8")
 def lint_setup_py(session):
 """Verify that setup.py is valid (including RST check)."""
 
 session.install("docutils", "Pygments")
 session.run("python", "setup.py", "check", "--restructuredtext", "--strict")
 
 
-# No 3.7 because pytype supports up to 3.6 only.
-@nox.session(python="3.6")
+@nox.session(python="3.8")
 def pytype(session):
 """Run type-checking."""
 session.install(".[grpc]", "pytype >= 2019.3.21")
@@ -178,7 +177,7 @@ def mypy(session):
 session.run("mypy", "google", "tests")
 
 
-@nox.session(python="3.6")
+@nox.session(python="3.8")
 def cover(session):
 """Run the final coverage report.
 

@@ -30,6 +30,7 @@
 ".coveragerc", # layout
 "CONTRIBUTING.rst", # no systests
 "./workflows/unittest.yml", # exclude unittest gh action
+"README.rst",
 ]
 templated_files = common.py_library(microgenerator=True, cov_level=100)
 s.move(templated_files, excludes=excludes)

@@ -12,7 +12,7 @@ Install Dependencies
 .. _Python Development Environment Setup Guide:
 https://cloud.google.com/python/setup
 
-#. Create a virtualenv. Samples are compatible with Python 3.6+.
+#. Create a virtualenv. Samples are compatible with Python 3.7+.
 
 .. code-block:: bash
 

@@ -1,5 +1,5 @@
 [pytype]
-python_version = 3.6
+python_version = 3.7
 inputs =
 google/
 exclude =

@@ -80,7 +80,6 @@
 "License :: OSI Approved :: Apache Software License",
 "Programming Language :: Python",
 "Programming Language :: Python :: 3",
-"Programming Language :: Python :: 3.6",
 "Programming Language :: Python :: 3.7",
 "Programming Language :: Python :: 3.8",
 "Programming Language :: Python :: 3.9",
@@ -93,7 +92,7 @@
 namespace_packages=namespaces,
 install_requires=dependencies,
 extras_require=extras,
-python_requires=">=3.6",
+python_requires=">=3.7",
 include_package_data=True,
 zip_safe=False,
 )