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diff --git a/src/python/grpcio/tests/interop/client.py b/src/python/grpcio/tests/interop/client.py
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+# 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.
+
+"""The Python implementation of the GRPC interoperability test client."""
+
+import argparse
+from oauth2client import client as oauth2client_client
+
+from grpc.beta import implementations
+
+from tests.interop import methods
+from tests.interop import resources
+from tests.interop import test_pb2
+from tests.unit.beta import test_utilities
+
+_ONE_DAY_IN_SECONDS = 60 * 60 * 24
+
+
+def _args():
+  parser = argparse.ArgumentParser()
+  parser.add_argument(
+      '--server_host', help='the host to which to connect', type=str)
+  parser.add_argument(
+      '--server_port', help='the port to which to connect', type=int)
+  parser.add_argument(
+      '--test_case', help='the test case to execute', type=str)
+  parser.add_argument(
+      '--use_tls', help='require a secure connection', default=False,
+      type=resources.parse_bool)
+  parser.add_argument(
+      '--use_test_ca', help='replace platform root CAs with ca.pem',
+      default=False, type=resources.parse_bool)
+  parser.add_argument(
+      '--server_host_override',
+      help='the server host to which to claim to connect', type=str)
+  parser.add_argument('--oauth_scope', help='scope for OAuth tokens', type=str)
+  parser.add_argument(
+      '--default_service_account',
+      help='email address of the default service account', type=str)
+  return parser.parse_args()
+
+def _oauth_access_token(args):
+  credentials = oauth2client_client.GoogleCredentials.get_application_default()
+  scoped_credentials = credentials.create_scoped([args.oauth_scope])
+  return scoped_credentials.get_access_token().access_token
+
+def _stub(args):
+  if args.oauth_scope:
+    if args.test_case == 'oauth2_auth_token':
+      # TODO(jtattermusch): This testcase sets the auth metadata key-value
+      # manually, which also means that the user would need to do the same
+      # thing every time he/she would like to use and out of band oauth token.
+      # The transformer function that produces the metadata key-value from
+      # the access token should be provided by gRPC auth library.
+      access_token = _oauth_access_token(args)
+      metadata_transformer = lambda x: [
+          ('authorization', 'Bearer %s' % access_token)]
+    else:
+      metadata_transformer = lambda x: [
+          ('authorization', 'Bearer %s' % _oauth_access_token(args))]
+  else:
+    metadata_transformer = lambda x: []
+  if args.use_tls:
+    if args.use_test_ca:
+      root_certificates = resources.test_root_certificates()
+    else:
+      root_certificates = resources.prod_root_certificates()
+
+    channel = test_utilities.not_really_secure_channel(
+        args.server_host, args.server_port,
+        implementations.ssl_client_credentials(root_certificates, None, None),
+        args.server_host_override)
+    stub = test_pb2.beta_create_TestService_stub(
+        channel, metadata_transformer=metadata_transformer)
+  else:
+    channel = implementations.insecure_channel(
+        args.server_host, args.server_port)
+    stub = test_pb2.beta_create_TestService_stub(channel)
+  return stub
+
+
+def _test_case_from_arg(test_case_arg):
+  for test_case in methods.TestCase:
+    if test_case_arg == test_case.value:
+      return test_case
+  else:
+    raise ValueError('No test case "%s"!' % test_case_arg)
+
+
+def test_interoperability():
+  args = _args()
+  stub = _stub(args)
+  test_case = _test_case_from_arg(args.test_case)
+  test_case.test_interoperability(stub, args)
+
+
+if __name__ == '__main__':
+  test_interoperability()