fix linting errors

backport/migrate/migrate.py

@@ -1,19 +1,16 @@
-import json
 import shutil
-import tempfile
 from pathlib import Path
-from typing import Any, Dict, Optional, cast
+from typing import Optional, cast
 
 import click
 import structlog
-from cookiecutter.main import cookiecutter
 from owid.catalog.utils import underscore
 from sqlalchemy.engine import Engine
 
 from etl import config
 from etl.backport_helpers import create_dataset
 from etl.db import get_engine
-from etl.files import apply_black_formatter_to_files, yaml_dump
+from etl.files import yaml_dump
 from etl.metadata_export import metadata_export
 from etl.paths import DAG_DIR, SNAPSHOTS_DIR, STEP_DIR
 from walkthrough.utils import add_to_dag, generate_step

walkthrough/snapshot.py

@@ -1,7 +1,7 @@
 import datetime as dt
 from enum import Enum
 from pathlib import Path
-from typing import Any, Optional
+from typing import Any
 
 from botocore.exceptions import ClientError
 from owid.catalog import s3_utils

walkthrough/snapshot_cookiecutter/{{cookiecutter.namespace}}/{{cookiecutter.snapshot_version}}/{{cookiecutter.short_name}}.py

@@ -25,8 +25,7 @@ def main(path_to_file: str, upload: bool) -> None:
     snap.path.parent.mkdir(exist_ok=True, parents=True)
 
     # Copy local data file to snapshots data folder.
-    snap.path.write_bytes(
-        Path(path_to_file).read_bytes())
+    snap.path.write_bytes(Path(path_to_file).read_bytes())
 
     # Add file to DVC and upload to S3.
     snap.dvc_add(upload=upload)

walkthrough/utils.py

@@ -17,7 +17,6 @@
     DAG_DIR,
     LATEST_POPULATION_VERSION,
     LATEST_REGIONS_VERSION,
-    SNAPSHOTS_DIR,
     STEP_DIR,
 )
 from etl.steps import DAG