diff --git a/app/cinema/bar.py b/app/cinema/bar.py
index 14314ce82..656bb15fd 100644
--- a/app/cinema/bar.py
+++ b/app/cinema/bar.py
@@ -4,4 +4,4 @@
 class CinemaBar:
     @staticmethod
     def sell_product(product: str, customer: Customer) -> None:
-        print(f'Cinema bar sold {product} to {customer.name}.')
+        print(f"Cinema bar sold {product} to {customer.name}.")
diff --git a/app/people/cinema_staff.py b/app/people/cinema_staff.py
index 5ff1aac93..ddab0df53 100644
--- a/app/people/cinema_staff.py
+++ b/app/people/cinema_staff.py
@@ -3,4 +3,4 @@ def __init__(self, name: str) -> None:
         self.name = name
 
     def clean_hall(self, hall_number: int) -> None:
-        print(f'Cleaner {self.name} is cleaning hall number {hall_number}.')
+        print(f"Cleaner {self.name} is cleaning hall number {hall_number}.")