Fix linter issues

Author: lpozo

python-property/circle_v4.py

@@ -1,5 +1,6 @@
 from time import sleep
 
+
 class Circle:
     def __init__(self, radius):
         self.radius = radius

python-property/circle_v5.py

@@ -1,5 +1,6 @@
 from time import sleep
 
+
 class Circle:
     def __init__(self, radius):
         self.radius = radius

python-property/circle_v6.py

@@ -1,6 +1,7 @@
 from functools import cached_property
 from time import sleep
 
+
 class Circle:
     def __init__(self, radius):
         self.radius = radius

python-property/circle_v7.py

@@ -1,12 +1,13 @@
 from functools import cache
 from time import sleep
 
+
 class Circle:
     def __init__(self, radius):
         self.radius = radius
 
     @property
     @cache
     def diameter(self):
-        sleep(0.5) # Simulate a costly computation
+        sleep(0.5)  # Simulate a costly computation
         return self.radius * 2