one import per line

tracim/views/contents_api/html_document_controller.py

 from tracim.views.core_api.schemas import NoContentSchema
 from tracim.lib.utils.authorization import require_content_types
 from tracim.lib.utils.authorization import require_workspace_role
-from tracim.exceptions import WorkspaceNotFound, ContentTypeNotAllowed
+from tracim.exceptions import WorkspaceNotFound
+from tracim.exceptions import ContentTypeNotAllowed
 from tracim.exceptions import InsufficientUserWorkspaceRole
 from tracim.exceptions import NotAuthenticated
 from tracim.exceptions import AuthenticationFailed

tracim/views/contents_api/threads_controller.py

 from tracim.exceptions import InsufficientUserWorkspaceRole
 from tracim.exceptions import NotAuthenticated
 from tracim.exceptions import AuthenticationFailed
-from tracim.models.context_models import ContentInContext, RevisionInContext
+from tracim.models.context_models import ContentInContext
+from tracim.models.context_models import RevisionInContext
 from tracim.models.contents import ContentTypeLegacy as ContentType
 from tracim.models.contents import thread_type
 from tracim.models.revision_protection import new_revision