fix flake8 linting issues 🧹

Author: soustruh

tests/test_dao.py

@@ -88,7 +88,7 @@ def test_datatype_accepts_enum_for_manifest_valid(self):
 
     def test_invalid_datatype_fails(self):
         tmetadata = TableMetadata()
-        with self.assertRaises(ValueError) as ctx:
+        with self.assertRaises(ValueError):
             tmetadata.add_column_data_type("col", "invalid type")
 
     def test_table_description_metadata_for_legacy_manifest_is_valid(self):
@@ -259,7 +259,7 @@ def test_out_old_to_new_has_headers_columns(self):
         self.assertEqual(manifest["has_header"], False)
 
     def test_out_pkey_and_no_columns_incompatible(self):
-        with self.assertRaises(UserException) as e:
+        with self.assertRaises(UserException):
             TableDefinition("testDef", "somepath", primary_key=["foo"])
 
     def test_out_legacy_to_new_compatible(self):
@@ -307,7 +307,7 @@ def test_table_manifest_minimal(self):
 
     def test_table_manifest_missing_key(self):
         with self.assertRaises(UserException) as e:
-            table_def = TableDefinition(
+            TableDefinition(
                 "testDef", "somepath", is_sliced=False, primary_key=["foo", "bar"]
             )
 
@@ -596,7 +596,7 @@ def test_table_manifest_error_column_delete_3(self):
     def test_unsupported_legacy_queue_properties_log(self):
         with self.assertLogs(level="WARNING") as log:
             td = TableDefinition("testDef", "somepath", write_always=True, stage="out")
-            manifest = td.get_manifest_dictionary(legacy_queue=True)
+            td.get_manifest_dictionary(legacy_queue=True)
             self.assertEqual(len(log.output), 1)
             self.assertEqual(len(log.records), 1)
             self.assertIn(
@@ -1181,7 +1181,9 @@ def test_build_from_manifest_abs_staging(self):
         )
         self.assertEqual(
             table_def.abs_staging.credentials_sas_connection_string,
-            "BlobEndpoint=https://asdf.blob.core.windows.net;SharedAccessSignature=sv=2017-11-09&sr=c&st=2020-08-27T08:42:08Z&se=2020-08-27T20:42:08Z&sp=rl&sig=UJW4DPh%2Baaaaaaaaaa",
+            "BlobEndpoint=https://asdf.blob.core.windows.net;SharedAccessSignature="
+
+            "sv=2017-11-09&sr=c&st=2020-08-27T08:42:08Z&se=2020-08-27T20:42:08Z&sp=rl&sig=UJW4DPh%2Baaaaaaaaaa",
         )
         self.assertEqual(table_def.abs_staging.is_sliced, True)
         self.assertEqual(table_def.abs_staging.name, "12345.csv.gzmanifest")