fix errors (#7577)

python_modules/dagster/dagster_tests/core_tests/asset_defs_tests/test_assets_job.py

@@ -339,9 +339,9 @@ def qux(baz):
 
 def test_fail_with_get_output_asset_key():
     @io_manager
-    def my_io_manager(context):
+    def my_io_manager(_context):
         class Mine(IOManager):
-            def get_output_asset_key(self, context):
+            def get_output_asset_key(self, _context):
                 return AssetKey("hey")
 
             def handle_output(self, context, obj):
@@ -363,8 +363,8 @@ def bar(foo):
     job = build_assets_job("x", [foo, bar], resource_defs={"io_manager": my_io_manager})
     with pytest.raises(
         DagsterInvariantViolationError,
-        match='The IOManager of output "result" on node "foo" associates it with asset key '
-        "\"AssetKey\(\['hey'\]\)\", but this output has already been defined to produce asset "
-        "\"AssetKey\(\['foo'\]\)\"",
+        match=r'The IOManager of output "result" on node "foo" associates it with asset key '
+        r"\"AssetKey\(\['hey'\]\)\", but this output has already been defined to produce asset "
+        r"\"AssetKey\(\['foo'\]\)\"",
     ):
         job.execute_in_process()

python_modules/dagster/dagster_tests/core_tests/host_representation_tests/test_external_data.py

@@ -1,7 +1,6 @@
 import pytest
 
 from dagster import AssetKey, DagsterInvariantViolationError, Out
-from dagster.check import CheckError
 from dagster.core.asset_defs import AssetIn, SourceAsset, asset, build_assets_job, multi_asset
 from dagster.core.definitions.metadata import MetadataEntry, MetadataValue
 from dagster.core.host_representation.external_data import (