add example of creating AutoML Tables client with non-default endpoin…

…t ('new' sdk) [(#3929)](GoogleCloudPlatform/python-docs-samples#3929)

* add example of creating client with non-default endpoint

* more test file cleanup

* move connectivity print stmt out of test fn

Co-authored-by: Leah E. Cole <6719667+leahecole@users.noreply.github.com>
Co-authored-by: Torry Yang <sirtorry@users.noreply.github.com>

samples/tables/automl_tables_set_endpoint.py

@@ -0,0 +1,33 @@
+# Copyright 2020 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+def create_client_with_endpoint(gcp_project_id):
+    """Create a Tables client with a non-default endpoint."""
+    # [START automl_set_endpoint]
+    from google.cloud import automl_v1beta1 as automl
+    from google.api_core.client_options import ClientOptions
+
+    # Set the endpoint you want to use via the ClientOptions.
+    # gcp_project_id = 'YOUR_PROJECT_ID'
+    client_options = ClientOptions(api_endpoint="eu-automl.googleapis.com:443")
+    client = automl.TablesClient(
+        project=gcp_project_id, region="eu", client_options=client_options
+    )
+    # [END automl_set_endpoint]
+
+    # do simple test to check client connectivity
+    print(client.list_datasets())
+
+    return client

samples/tables/endpoint_test.py

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+#!/usr/bin/env python
+
+# Copyright 2020 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import os
+
+import automl_tables_set_endpoint
+
+PROJECT = os.environ["GCLOUD_PROJECT"]
+
+
+def test_client_creation(capsys):
+    automl_tables_set_endpoint.create_client_with_endpoint(PROJECT)
+    out, _ = capsys.readouterr()
+    assert "GRPCIterator" in out