Fix flake8 warnings

New warnings after updating flake8 version used by pre-commit-hooks

app/api/inventory.py

@@ -45,7 +45,7 @@ def get_items():
 @bp.route("/items/<id_>")
 @login_required
 def get_item(id_):
-    """Retrieve item by id or ICS id
+    r"""Retrieve item by id or ICS id
 
     .. :quickref: Inventory; Get item by id or ICS id
 
@@ -83,7 +83,7 @@ def create_item():
 @bp.route("/items/<id_>", methods=["PATCH"])
 @login_groups_accepted("admin", "inventory")
 def patch_item(id_):
-    """Patch an existing item
+    r"""Patch an existing item
 
     .. :quickref: Inventory; Update existing item
 
@@ -143,7 +143,7 @@ def patch_item(id_):
 @bp.route("/items/<id_>/comments")
 @login_required
 def get_item_comments(id_):
-    """Get item comments
+    r"""Get item comments
 
     .. :quickref: Inventory; Get item comments
 
@@ -156,7 +156,7 @@ def get_item_comments(id_):
 @bp.route("/items/<id_>/comments", methods=["POST"])
 @login_groups_accepted("admin", "inventory")
 def create_item_comment(id_):
-    """Create a comment on item
+    r"""Create a comment on item
 
     .. :quickref: Inventory; Create comment on item
 

app/inventory/views.py

@@ -234,7 +234,7 @@ def attributes(kind):
         db.session.add(new_model)
         try:
             db.session.commit()
-        except sa.exc.IntegrityError as e:
+        except sa.exc.IntegrityError:
             db.session.rollback()
             flash(f"{form.name.data} already exists! {kind} not created.", "error")
         else: