chore(deps)!: require 3.6+ (#961)

Removes 2.7 and 3.5 from the test suite and explicitly requires >= 3.6. Also adds tests for 3.9

Fixes #704 🦕

README.md

@@ -48,11 +48,11 @@ virtualenv <your-env>
 
 ## Supported Python Versions
 
-Python 3.5, 3.6 and 3.7, and 3.8 are fully supported and tested. This library may work on later versions of 3, but we do not currently run tests against those versions
+Python 3.6, 3.7, 3.8, and 3.9 are fully supported and tested. This library may work on later versions of 3, but we do not currently run tests against those versions.
 
-## Deprecated Python Versions
+## Unsupported Python Versions
 
-Python == 2.7
+Python < 3.6
 
 ## Third Party Libraries and Dependencies
 

noxfile.py

@@ -18,6 +18,7 @@
 import nox
 
 test_dependencies = [
+    "django>=2.0.0",
     "google-auth",
     "google-auth-httplib2",
     "mox",
@@ -46,7 +47,7 @@ def lint(session):
     )
 
 
-@nox.session(python=["2.7", "3.5", "3.6", "3.7", "3.8"])
+@nox.session(python=["3.6", "3.7", "3.8", "3.9"])
 @nox.parametrize(
     "oauth2client",
     [
@@ -59,11 +60,6 @@ def lint(session):
 def unit(session, oauth2client):
     session.install(*test_dependencies)
     session.install(oauth2client)
-    if session.python < "3.0":
-        session.install("django<2.0.0")
-    else:
-        session.install("django>=2.0.0")
-
     session.install('.')
 
     # Run py.test against the unit tests.

setup.py

@@ -21,11 +21,8 @@
 
 import sys
 
-if sys.version_info < (2, 7):
-    print("google-api-python-client requires python version >= 2.7.", file=sys.stderr)
-    sys.exit(1)
-if (3, 1) <= sys.version_info < (3, 4):
-    print("google-api-python-client requires python3 version >= 3.4.", file=sys.stderr)
+if sys.version_info < (3, 6):
+    print("google-api-python-client requires python3 version >= 3.6.", file=sys.stderr)
     sys.exit(1)
 
 import io
@@ -61,18 +58,17 @@
     author_email="googleapis-packages@google.com",
     url="https://github.com/googleapis/google-api-python-client/",
     install_requires=install_requires,
-    python_requires=">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*",
+    python_requires=">=3.6",
     packages=packages,
     package_data={},
     license="Apache 2.0",
     keywords="google api client",
     classifiers=[
-        "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",
         "Development Status :: 5 - Production/Stable",
         "Intended Audience :: Developers",
         "License :: OSI Approved :: Apache Software License",