flake8: check F408 about unused imports, manual fixes only

.flake8

@@ -4,9 +4,8 @@
 # W: style warnings
 # C: complexity
 # D: docstring warnings (unused pydocstyle extension)
-# F401: module imported but unused
 # F841: local variable assigned but never used
-ignore = E, C, W, D, F401, F841
+ignore = E, C, W, D, F841
 builtins = c, get_config
 exclude =
     .cache,

docs/source/conf.py

@@ -250,7 +250,7 @@ if on_rtd:
 # -- Spell checking -------------------------------------------------------
 
 try:
-    import sphinxcontrib.spelling
+    import sphinxcontrib.spelling  # noqa
 except ImportError:
     pass
 else:

examples/service-fastapi/app/__init__.py

@@ -1 +1 @@
-from .app import app
+from .app import app  # noqa

jupyterhub/__init__.py

@@ -1 +1 @@
-from ._version import __version__, version_info
+from ._version import __version__, version_info  # noqa

jupyterhub/alembic/versions/19c0846f6344_base_revision_for_0_5.py

@@ -14,7 +14,6 @@ depends_on = None
 import sqlalchemy as sa
 from alembic import op
 
-
 def upgrade():
     pass
 

jupyterhub/singleuser/__init__.py

@@ -2,8 +2,8 @@
 
 Contains default notebook-app subclass and mixins
 """
-from .app import SingleUserNotebookApp, main
-from .mixins import HubAuthenticatedHandler, make_singleuser_app
+from .app import SingleUserNotebookApp, main  # noqa
+from .mixins import HubAuthenticatedHandler, make_singleuser_app  # noqa
 
 # backward-compatibility
 JupyterHubLoginHandler = SingleUserNotebookApp.login_handler_class