Fix issue from video: Python for data engineers > Advanced Python > Modules

src/modules.py

@@ -3,7 +3,7 @@
 from my_classes import MyAge
 
 my_age = MyAge("1985-01-01", "Mr James")
-my_age.show_me_my_age()
+print(my_age.show_me_my_age())
 # > 'Mr James, you are so young, only 41 years old!'
 
 # additional learexample with the import as command

src/my_classes.py

@@ -14,9 +14,12 @@ def __init__(self, date_of_birth, my_name):
     # create print function
     def show_me_my_age(self):
         return f"{self.__my_name}, you are so young, only {self.__my_age_years} years old!"
-
-
-# instantiate the class and execute the print function
-age = MyAge("1982-08-04", "Mr James")
-print(age.show_me_my_age())
-# > 'Mr James, you are so young, only 39 years old!'
+# Fix for the issue shown in training video "Python for data engineers > Advanced Python > Modules":
+# Without this guard, importing this file from modules.py would also execute the block below,
+# printing the hardcoded date instead of the date passed by the caller.
+# if __name__ == "__main__" ensures this block only runs when this file is executed directly.
+if __name__ == "__main__":
+    # instantiate the class and execute the print function
+    age = MyAge("1982-08-04", "Mr James")
+    print(age.show_me_my_age())
+    # > 'Mr James, you are so young, only 46 years old!'