Fixed Travis issues with my commit
@@ -16,7 +16,7 @@ from pip._internal.utils.compat import WINDOWS, expanduser
from pip._internal.utils.typing import MYPY_CHECK_RUNNING
if MYPY_CHECK_RUNNING:
- from typing import Union, Dict, List, Optional
+ from typing import Union, Dict, List, Optional # noqa: F401
# Application Directories
USER_CACHE_DIR = appdirs.user_cache_dir("pip")
