@@ -8,20 +8,22 @@
 import sys
 
 print("\nCreating a new list, `list_1`")
-list_1 = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0]
+list_1 = list(range(1, 10))
+print(f"list_1: {list_1}")
+# list_1 = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0]
 
-print("Reference count of `list_1`: {}".format(sys.getrefcount(list_1)))
+print(f"Reference count of `list_1`: {sys.getrefcount(list_1)}")
 
 print("\nAssigning a new reference (list_2) to `list_1`")
 list_2 = list_1
-print("Reference count of `list_1`: {}".format(sys.getrefcount(list_1)))
+print(f"Reference count of `list_1`: {sys.getrefcount(list_1)}")
 
 print("\nAssigning a new reference (list_3) to `list_1`")
 list_3 = list_1
-print("Reference count of `list_1`: {}".format(sys.getrefcount(list_1)))
+print(f"Reference count of `list_1`: {sys.getrefcount(list_1)}")
 
 print("\nDeleting reference lists, list_2 and list_3")
 del list_2
 del list_3
 
-print("Reference count of `list_1`: {}".format(sys.getrefcount(list_1)))
+print(f"Reference count of `list_1`: {sys.getrefcount(list_1)}")
@@ -9,26 +9,23 @@
 for i in dir():
     print("{:>20} : {}".format(i, sys.getsizeof(i)))
 
-
+##
 print("\nCreating new objects.")
 
 # Class
-
-
 class MyClass:
     pass
 
 
 # Function
-
-
 def my_func():
     pass
 
 
 # Lists:
 list_1 = [1, 2, 3, 4, 5, 6, 7, 8, 9]
 
+##
 print("Getting a new object size listing:\n")
 for i in dir():
     print("{:>20} : {}".format(i, sys.getsizeof(i)))
@@ -23,5 +23,7 @@ def test(self):
 my_class = MyClass()
 my_new_class = MyNewClass()
 
-print("Size of class object w/o atts: {}".format(sys.getsizeof(my_class)))
-print("Size of class object with attrs: {}".format(sys.getsizeof(my_new_class)))
+if __name__ == "__main__":
+    print(f"Script name: {sys.argv[0]}")
+    print(f"Size of class object w/o atts: {sys.getsizeof(my_class)}")
+    print(f"Size of class object with attrs: {sys.getsizeof(my_new_class)}")
@@ -23,5 +23,5 @@ def test(self):
 my_class = MyClass()
 my_new_class = MyNewClass()
 
-print("Size of class object w/o atts: {}".format(sys.getsizeof(my_class)))
-print("Size of class object with attrs: {}".format(sys.getsizeof(my_new_class)))
+print(f"Size of class object w/o atts: {sys.getsizeof(my_class)}")
+print(f"Size of class object with attrs: {sys.getsizeof(my_new_class)}")