feat: remove python 3.6 support (#689)

* remove python 3.6 support * few more things * try deleting kokoro python3.6 samples

Author: Aaron Gabriel Neyer

.kokoro/samples/python3.6/common.cfg

@@ -43,7 +43,7 @@ Installation
 `venv`_ is a tool to create isolated Python environments. The basic problem it
 addresses is one of dependencies and versions, and indirectly permissions.
 
-Make sure you're using Python 3.3 or later, which includes `venv`_ by default.
+Make sure you're using Python 3.7 or later, which includes `venv`_ by default.
 With `venv`, it's possible to install this library without needing system
 install permissions, and without clashing with the installed system
 dependencies.
@@ -54,14 +54,17 @@ dependencies.
 
 Supported Python Versions
 ^^^^^^^^^^^^^^^^^^^^^^^^^
-Python >= 3.6
+Python >= 3.7
 
 Deprecated Python Versions
 ^^^^^^^^^^^^^^^^^^^^^^^^^^
-Python == 2.7: Python 2.7 support will be removed sometime after January 1, 2020.
 
 Unsupported Python Versions
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Python == 3.6: the last released version which supported Python 3.6 was
+``google-cloud-storage 2.0.0``, released 2022-01-12.
+
 Python == 3.5: the last released version which supported Python 3.5 was
 ``google-cloud-storage 1.32.0``, released 2020-10-16.
 

.kokoro/samples/python3.6/continuous.cfg

@@ -29,7 +29,7 @@
 
 DEFAULT_PYTHON_VERSION = "3.8"
 SYSTEM_TEST_PYTHON_VERSIONS = ["3.8"]
-UNIT_TEST_PYTHON_VERSIONS = ["3.6", "3.7", "3.8", "3.9", "3.10"]
+UNIT_TEST_PYTHON_VERSIONS = ["3.7", "3.8", "3.9", "3.10"]
 CONFORMANCE_TEST_PYTHON_VERSIONS = ["3.8"]
 
 _DEFAULT_STORAGE_HOST = "https://storage.googleapis.com"

.kokoro/samples/python3.6/periodic-head.cfg

@@ -26,7 +26,7 @@
 templated_files = common.py_library(
  cov_level=100,
  split_system_tests=True,
- unit_test_python_versions=["3.6", "3.7", "3.8", "3.9", "3.10"],
+ unit_test_python_versions=["3.7", "3.8", "3.9", "3.10"],
  system_test_external_dependencies=[
  "google-cloud-iam",
  "google-cloud-pubsub < 2.0.0",

.kokoro/samples/python3.6/periodic.cfg

@@ -72,7 +72,7 @@ def get_cloud_kms_key():
 
 TEST_CONFIG_OVERRIDE = {
  # You can opt out from the test for specific Python versions.
- 'ignored_versions': ["2.7"],
+ 'ignored_versions': ["2.7", "3.6"],
 
  # An envvar key for determining the project id to use. Change it
  # to 'BUILD_SPECIFIC_GCLOUD_PROJECT' if you want to opt in using a

.kokoro/samples/python3.6/presubmit.cfg

@@ -78,7 +78,6 @@
  "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",
@@ -91,7 +90,7 @@
  namespace_packages=namespaces,
  install_requires=dependencies,
  extras_require=extras,
- python_requires=">=3.6",
+ python_requires=">=3.7",
  include_package_data=True,
  zip_safe=False,
 )