Fix linting errors

.gitignore

@@ -177,4 +177,3 @@ cython_debug/
 
 # Bazel build files
 bazel-*
-

ml_metadata/proto/__init__.py

@@ -14,29 +14,29 @@
 """ML Metadata proto module."""
 
 # Connection configurations for different deployment.
-from ml_metadata.proto.metadata_store_pb2 import (
-    ConnectionConfig,
-    MetadataStoreClientConfig,
+from ml_metadata.proto import (
+    metadata_store_service_pb2,
+    metadata_store_service_pb2_grpc,
 )
 
 # ML Metadata core data model concepts.
 from ml_metadata.proto.metadata_store_pb2 import (
     Artifact,
-    Execution,
+    ArtifactType,
+    Association,
+    Attribution,
+    ConnectionConfig,
     Context,
+    ContextType,
     Event,
-    Attribution,
-    Association,
-    ParentContext,
-    ArtifactType,
+    Execution,
     ExecutionType,
-    ContextType,
     FakeDatabaseConfig,
+    MetadataStoreClientConfig,
     MySQLDatabaseConfig,
+    ParentContext,
     SqliteMetadataSourceConfig,
 )
-from ml_metadata.proto import metadata_store_service_pb2
-from ml_metadata.proto import metadata_store_service_pb2_grpc
 
 del metadata_store_service_pb2
 del metadata_store_service_pb2_grpc

setup.py

@@ -128,7 +128,7 @@ def run(self):
   _LONG_DESCRIPTION = fp.read()
 
 # Get documentation build requirements
-with open("requirements-docs.txt", "r") as fp:
+with open("requirements-docs.txt") as fp:
   docs_reqs = fp.readlines()
 docs_reqs = [req.replace("\n", "") for req in docs_reqs]