docs: revise label table code samples

docs/snippets.py

@@ -250,6 +250,9 @@ def test_manage_table_labels(client, to_delete):
     table = bigquery.Table(dataset.table(table_id), schema=SCHEMA)
     table = client.create_table(table)
 
+    # TODO(Mattix23): After code sample from https://github.com/googleapis/python-bigquery/pull/1451
+    # is updated from cloud.google.com delete this.
+
     # [START bigquery_label_table]
     # from google.cloud import bigquery
     # client = bigquery.Client()

samples/snippets/label_table.py

@@ -0,0 +1,37 @@
+# Copyright 2022 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
+#
+#     https://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 label_table(table_id: str) -> None:
+    orig_table_id = table_id
+    # [START bigquery_label_table]
+    from google.cloud import bigquery
+
+    client = bigquery.Client()
+
+    # TODO(dev): Change table_id to the full name of the table you want to create.
+    table_id = "your-project.your_dataset.your_table_name"
+
+    # [END bigquery_label_table]
+    table_id = orig_table_id
+    # [START bigquery_label_table]
+    table = client.get_table(table_id)  # API request
+
+    labels = {"color": "green"}
+    table.labels = labels
+
+    table = client.update_table(table, ["labels"])  # API request
+
+    print(f"Added {table.labels} to {table_id}.")
+    # [END bigquery_label_table]

samples/snippets/label_table_test.py

@@ -0,0 +1,32 @@
+# Copyright 2022 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
+#
+#     https://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 typing
+
+import label_table
+
+if typing.TYPE_CHECKING:
+    import pytest
+
+
+def test_label_table(
+    capsys: "pytest.CaptureFixture[str]",
+    table_id: str,
+) -> None:
+
+    label_table.label_table(table_id)
+
+    out, _ = capsys.readouterr()
+    assert "color" in out
+    assert table_id in out