drop python2 support

- remove python2 from the .travis.yaml file
  - remove python2 from the tox.ini file
  - remove `-y` flag from isort command in update-pycodestle.sh script
  - fix sequence of module imports to fix faiing pycodestyle check in the following files:
    - examples/multiple_clusters.py
    - examples/pick_kube_config_context.py
    - examples/pod_config_list.py
  - testing coverage & codecov tests with python3
  - testing `update-pycodestyle` for python v3.9 and arch ppc6le

Signed-off-by: Priyanka Saggu <priyankasaggu11929@gmail.com>

.travis.yml

@@ -24,7 +24,11 @@ jobs:
       [[ "${TRAVIS_TAG}" =~ ^v[0-9]+\.[0-9]+\.[0-9]+(([ab]|dev|rc)[0-9]+)?$ ]]
 
   - stage: test
-    python: 3.7
+    python: 3.9
+    env: TOXENV=update-pycodestyle 
+  - python: 3.9
+    env: TOXENV=coverage,codecov      
+  - python: 3.7
     env: TOXENV=docs
   - python: 3.5
     env: TOXENV=py35
@@ -60,7 +64,10 @@ jobs:
       distributions: sdist bdist_wheel
 
   - stage: test
-    python: 3.7
+    python: 3.9
+    env: TOXENV=update-pycodestyle
+    arch: ppc64le    
+  - python: 3.7
     env: TOXENV=docs
     arch: ppc64le
   - python: 3.5

examples/multiple_clusters.py

@@ -18,9 +18,10 @@ Allows you to pick a context and then lists all pods in the chosen context.
 Please install the pick library before running this example.
 """
 
+from pick import pick  # install pick using `pip install pick`
+
 from kubernetes import client, config
 from kubernetes.client import configuration
-from pick import pick  # install pick using `pip install pick`
 
 
 def main():

examples/pick_kube_config_context.py

@@ -18,9 +18,10 @@ Allows you to pick a context and then lists all pods in the chosen context.
 Please install the pick library before running this example.
 """
 
+from pick import pick  # install pick using `pip install pick`
+
 from kubernetes import client, config
 from kubernetes.client import configuration
-from pick import pick  # install pick using `pip install pick`
 
 
 def main():

examples/pod_config_list.py

@@ -19,9 +19,10 @@ context includes a cluster, a user, and a namespace.
 Please install the pick library before running this example.
 """
 
+from pick import pick  # install pick using `pip install pick`
+
 from kubernetes import client, config
 from kubernetes.client import configuration
-from pick import pick  # install pick using `pip install pick`
 
 
 def main():

scripts/update-pycodestyle.sh

@@ -67,7 +67,7 @@ done
 
 echo "--- applying isort"
 for SOURCE in $SOURCES; do
-    isort -y $SOURCE
+    isort $SOURCE
 done
 
 echo "--- check pycodestyle (all need to be fixed manually)"