Solution

app/cinema/bar.py

@@ -1,3 +1,6 @@
+from app.people.customer import Customer
+
+
 class CinemaBar:
-    def sell_product(self, product: str, customer: "Customer") -> None:
+    def sell_product(self, product: str, customer: Customer) -> None:
         print(f" Cinema bar sold {product} to {customer}.")

app/cinema/hall.py

@@ -1,8 +1,13 @@
+from app.people.customer import Customer
+from app.people.cinema_staff import Cleaner
+
+
 class CinemaHall:
     def __init__(self, hall_number: int) -> None:
         self.hall_number = hall_number
 
-    def movie_session(self, movie_name: str, customers: list[Customer], cleaning_staff: Cleaner) -> None:
+    def movie_session(self, movie_name: str, customers: list[Customer],
+                      cleaning_staff: Cleaner) -> None:
         print(f"'{movie_name}' started in hall number {self.hall_number}.")
         for customer in customers:
             customer.watch_movie(movie_name)

app/people/customer.py

@@ -4,5 +4,4 @@ def __init__(self, name: str, food: str) -> None:
         self.food = food
 
     def watch_movie(self, movie: str) -> None:
-        print(f"{self.name} is watching "{movie}".")
-
+        print(f"{self.name} is watching '{movie}'.")