Expand scope of python file format checks.

This expands check_header.sh and isort.sh scope out to the examples/ and
testprojects/ directories.

Testing Done:
I ran `./build-support/bin/check_header.sh` and
`./build-support/bin/isort.sh -f` producing the examples/ and
testprojects/ fixes in this RB.

CI went green here:
  https://travis-ci.org/pantsbuild/pants/builds/49789005

Bugs closed: 1052

Reviewed at https://rbcommons.com/s/twitter/r/1729/

build-support/bin/check_header.sh

@@ -14,7 +14,7 @@ from __future__ import (absolute_import, division, generators, nested_scopes, pr
 EOF
 )
 
-py_files=$(find src tests pants-plugins -name '*.py' -not -name __init__.py)
+py_files=$(find src tests pants-plugins examples -name '*.py' -not -name __init__.py)
 known_bad_headers=$(cat <<EOF
 tests/python/pants_test/tasks/false.py
 tests/python/pants_test/tasks/true.py

build-support/bin/isort.sh

@@ -74,5 +74,5 @@ function activate_isort() {
 
 activate_isort
 
-isort ${isort_args[@]} --recursive src tests pants-plugins
+isort ${isort_args[@]} --recursive src tests pants-plugins examples
 

examples/.isort.cfg

@@ -0,0 +1,9 @@
+# See the menu of settings available here:
+#   https://github.com/timothycrosley/isort/wiki/isort-Settings
+
+[settings]
+line_length=100
+indent=2
+lines_after_imports=2
+known_first_party=example
+default_section=THIRDPARTY

examples/src/python/example/hello/greet/greet.py

@@ -2,8 +2,8 @@
 # Copyright 2014 Pants project contributors (see CONTRIBUTORS.md).
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
-from __future__ import (nested_scopes, generators, division, absolute_import, with_statement,
-                        print_function, unicode_literals)
+from __future__ import (absolute_import, division, generators, nested_scopes, print_function,
+                        unicode_literals, with_statement)
 
 from colors import green
 

examples/src/python/example/hello/main/main.py

@@ -2,8 +2,8 @@
 # Copyright 2014 Pants project contributors (see CONTRIBUTORS.md).
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
-from __future__ import (nested_scopes, generators, division, absolute_import, with_statement,
-                        print_function, unicode_literals)
+from __future__ import (absolute_import, division, generators, nested_scopes, print_function,
+                        unicode_literals, with_statement)
 
 import sys
 

examples/src/python/example/pants_publish_plugin/extra_test_jar_example.py

@@ -2,12 +2,16 @@
 # Copyright 2014 Pants project contributors (see CONTRIBUTORS.md).
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
+from __future__ import (absolute_import, division, generators, nested_scopes, print_function,
+                        unicode_literals, with_statement)
+
 import os
 
 from pants.backend.jvm.targets.java_library import JavaLibrary
 from pants.backend.jvm.tasks.jar_task import JarTask
 from pants.util.dirutil import safe_mkdir
 
+
 ##
 ## See `Appendix A` in the 'publish' documentation:
 ##

examples/src/python/example/pants_publish_plugin/register.py

@@ -2,12 +2,13 @@
 # Copyright 2014 Pants project contributors (see CONTRIBUTORS.md).
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
-from __future__ import (nested_scopes, generators, division, absolute_import, with_statement,
-                        print_function, unicode_literals)
+from __future__ import (absolute_import, division, generators, nested_scopes, print_function,
+                        unicode_literals, with_statement)
 
-from example.pants_publish_plugin.extra_test_jar_example import ExtraTestJarExample
 from pants.goal.task_registrar import TaskRegistrar as task
 
+from example.pants_publish_plugin.extra_test_jar_example import ExtraTestJarExample
+
 
 # Register this custom task on the 'jar' phase. When the RoundEngine reaches this phase, it will
 # execute all tasks that have previously registered for this phase.

examples/tests/python/example_test/hello/greet/greet.py

@@ -2,8 +2,8 @@
 # Copyright 2014 Pants project contributors (see CONTRIBUTORS.md).
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
-from __future__ import (nested_scopes, generators, division, absolute_import, with_statement,
-                        print_function, unicode_literals)
+from __future__ import (absolute_import, division, generators, nested_scopes, print_function,
+                        unicode_literals, with_statement)
 
 import os
 import unittest

examples/tests/python/example_test/usethriftpy/use_thrift_test.py

@@ -1,14 +1,19 @@
+# coding=utf-8
 # Copyright 2014 Pants project contributors (see CONTRIBUTORS.md).
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
-# Illustrate using Thrift-generated code from Python.
+from __future__ import (absolute_import, division, generators, nested_scopes, print_function,
+                        unicode_literals, with_statement)
 
 import unittest
 
 from com.pants.examples.distance.ttypes import Distance
 from com.pants.examples.precipitation.ttypes import Precipitation
 
 
+# Illustrate using Thrift-generated code from Python.
+
+
 class UseThriftTest(unittest.TestCase):
   def test_make_it_rain(self):
     distance = Distance()