Drop support for Python 3.5. (#9622)

* Drop support for Python 3.5.

* Update setup.py

python/build-wheel-macos.sh

@@ -13,23 +13,19 @@ MACPYTHON_URL=https://www.python.org/ftp/python
 MACPYTHON_PY_PREFIX=/Library/Frameworks/Python.framework/Versions
 DOWNLOAD_DIR=python_downloads
 
-PY_VERSIONS=("3.5.3"
-             "3.6.1"
+PY_VERSIONS=("3.6.1"
              "3.7.0"
              "3.8.2")
-PY_INSTS=("python-3.5.3-macosx10.6.pkg"
-          "python-3.6.1-macosx10.6.pkg"
+PY_INSTS=("python-3.6.1-macosx10.6.pkg"
           "python-3.7.0-macosx10.6.pkg"
           "python-3.8.2-macosx10.9.pkg")
-PY_MMS=("3.5"
-        "3.6"
+PY_MMS=("3.6"
         "3.7"
         "3.8")
 
 # The minimum supported numpy version is 1.14, see
 # https://issues.apache.org/jira/browse/ARROW-3141
 NUMPY_VERSIONS=("1.14.5"
-                "1.14.5"
                 "1.14.5"
                 "1.14.5")
 

python/build-wheel-manylinux1.sh

@@ -11,15 +11,13 @@ echo 10
 EOF
 chmod +x /usr/bin/nproc
 
-PYTHONS=("cp35-cp35m"
-         "cp36-cp36m"
+PYTHONS=("cp36-cp36m"
          "cp37-cp37m"
          "cp38-cp38")
 
 # The minimum supported numpy version is 1.14, see
 # https://issues.apache.org/jira/browse/ARROW-3141
 NUMPY_VERSIONS=("1.14.5"
-                "1.14.5"
                 "1.14.5"
                 "1.14.5")
 

python/setup.py

@@ -25,7 +25,7 @@ logger = logging.getLogger(__name__)
 # before these files have been created, so we have to move the files
 # manually.
 
-SUPPORTED_PYTHONS = [(3, 5), (3, 6), (3, 7), (3, 8)]
+SUPPORTED_PYTHONS = [(3, 6), (3, 7), (3, 8)]
 SUPPORTED_BAZEL = (3, 2, 0)
 
 ROOT_DIR = os.path.dirname(__file__)