new file structure v1

main.py → app.py

 # Importing modules rectangle, circle, square from scripts
-from scripts import Rectangle
-from scripts import Circle
-from scripts import Square
+from scripts.core import Circle, Rectangle, Square
 
 # User Inputs
 while True:
@@ -48,5 +46,6 @@ while True:
     else:
         print("Please check the spelling.....")
 
+    # invalid calculation choice
     if error == 1:
         print("Calculation choice error....")

scripts/constants/values.py

+# value of pi
+pi = 3.14

scripts/Circle.py → scripts/core/Circle.py

+# import pi from constant
+from scripts.constants import values
+
 # class for shape circle
 class Circle:
     def __init__(self, circle_radius):
@@ -11,7 +14,7 @@ class Area(Circle):
 
     def display_area(self):
         try:
-            return 3.14 * self.radius * self.radius
+            return values.pi * self.radius * self.radius
         except Exception as e:
             print(f'Exception occurred: {e}')
 
@@ -23,6 +26,6 @@ class Perimeter(Circle):
 
     def display_perimeter(self):
         try:
-            return 2 * 3.14 * self.radius
+            return 2 * values.pi * self.radius
         except Exception as e:
             print(f'Exception occurred: {e}')