feat: add __str__ method to DatasetReference (#1477)

* feat: add __str__ method to DatasetReference

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: Mattix23

google/cloud/bigquery/dataset.py

@@ -215,6 +215,9 @@ def __ne__(self, other):
     def __hash__(self):
         return hash(self._key())
 
+    def __str__(self):
+        return f"{self.project}.{self._dataset_id}"
+
     def __repr__(self):
         return "DatasetReference{}".format(self._key())
 

tests/unit/test_dataset.py

@@ -622,6 +622,10 @@ def test___repr__(self):
         expected = "DatasetReference('project1', 'dataset1')"
         self.assertEqual(repr(dataset), expected)
 
+    def test___str__(self):
+        dataset = self._make_one("project1", "dataset1")
+        self.assertEqual(str(dataset), "project1.dataset1")
+
 
 class TestDataset(unittest.TestCase):
     from google.cloud.bigquery.dataset import DatasetReference