Enable running Python formatting
diff --git a/tools/distrib/pyformat_code.sh b/tools/distrib/pyformat_code.sh
new file mode 100755
index 0000000..e3ebf1c
--- /dev/null
+++ b/tools/distrib/pyformat_code.sh
@@ -0,0 +1,60 @@
+#!/bin/bash
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+# * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+# * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+# * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+set -ex
+
+# change to root directory
+cd $(dirname $0)/../..
+
+DIRS=src/python
+EXCLUSIONS='src/python/grpcio/grpc_*.py src/python/grpcio_health_checking/grpc_*.py src/python/grpcio_reflection/grpc_*.py src/python/grpcio_tests/grpc_*.py'
+
+VIRTUALENV=python_format_venv
+
+virtualenv $VIRTUALENV
+PYTHON=`realpath $VIRTUALENV/bin/python`
+$PYTHON -m pip install --upgrade futures yapf
+
+exclusion_args=""
+for exclusion in $EXCLUSIONS; do
+ exclusion_args="$exclusion_args --exclude $exclusion"
+done
+
+script_result=0
+for dir in $DIRS; do
+ tempdir=`mktemp -d`
+ cp -RT $dir $tempdir
+ $PYTHON -m yapf -i -r -p $exclusion_args $dir
+ if ! diff -rq $dir $tempdir; then
+ script_result=1
+ fi
+ rm -rf $tempdir
+done
+exit $script_result