diff --git a/example_publisher/publisher.py b/example_publisher/publisher.py
index 1b4ceb8..a0bb7f9 100644
--- a/example_publisher/publisher.py
+++ b/example_publisher/publisher.py
@@ -87,7 +87,9 @@ async def _upd_products(self):
         }
         log.debug("fetched product accounts from Pythd", products=pythd_products)
 
-        old_products_by_generic_symbol = {product.generic_symbol: product for product in self.products}
+        old_products_by_generic_symbol = {
+            product.generic_symbol: product for product in self.products
+        }
 
         self.products = []