updated with new project structure.

app.py

+from scripts.services.main import shape
+
+shape()
\ No newline at end of file

scripts/constants/values.py

+PI = 3.14

shape/circle.py → scripts/core/handlers/circle.py

+from scripts.constants.values import PI
 # inherited Exception class
 class TestException(Exception):
     pass
@@ -9,7 +10,7 @@ class Circle:
 
     def area_circle(self):
         try:
-            area = 3.14 * self.radius * self.radius
+            area = PI * self.radius * self.radius
             return area
         except TestException:
             print("\nException Occurred\n")
@@ -18,7 +19,7 @@ class Circle:
 
     def perimeter_circle(self):
         try:
-            perimeter = 2 * 3.14 * self.radius
+            perimeter = 2 * PI * self.radius
             return perimeter
         except TestException:
             print("\nException Occurred\n")

main.py → scripts/services/main.py

 """import shapes from package 'shape'."""
-from shape.rectangle import Rect
-from shape.square import Square
-from shape.circle import Circle
+from scripts.core.handlers.rectangle import Rect
+from scripts.core.handlers.square import Square
+from scripts.core.handlers.circle import Circle
 
-# iterating variable
-i = 1
-while i == 1:
-    print("----------Area & Perimeter----------\n"
-          "1.Rectangle\n"
-          "2.Circle\n"
-          "3.Square\n"
-          "4.Enter 0 to exit\n")
-    choice = int(input("Enter the choice: "))
-    if choice == 1:
-        rect_length = float(input(
-            "Enter the length: "))
-        rect_breadth = float(input(
-            "Enter the breadth: "))
-        # creating object of Rect
-        rect_inst = Rect(rect_length, rect_breadth)
-        print("Area of Rectangle: ",
-              rect_inst.area_rect())
-        print("Perimeter of Rectangle: ",
-              rect_inst.perimeter_rect())
-    elif choice == 2:
-        circle_radius = float(input(
-            "Enter the radius: "))
-        # creating object of Circle
-        circle_inst = Circle(circle_radius)
-        print("Area of Circle: ",
-              circle_inst.area_circle())
-        print("\nCircumference of Circle: ",
-              circle_inst.perimeter_circle())
-    elif choice == 3:
-        square_side = float(input(
-            "Enter the side length: "))
-        # creating  object of Square
-        square_inst = Square(square_side)
-        print("Area of Square: ",
-              square_inst.area_square())
-        print("Perimeter of Square: ",
-              square_inst.perimeter_square())
-    elif choice == 0:
-        i = 0
-        # Exit if ch
+def shape():
+    # iterating variable
+    i = 1
+    while i == 1:
+        print("----------Area & Perimeter----------\n"
+              "1.Rectangle\n"
+              "2.Circle\n"
+              "3.Square\n"
+              "4.Exit\n")
+        choice = int(input("Enter the choice: "))
+        if choice == 1:
+            rect_length = float(input(
+                "Enter the length: "))
+            rect_breadth = float(input(
+                "Enter the breadth: "))
+            # creating object of Rect
+            rect_inst = Rect(rect_length, rect_breadth)
+            print("Area of Rectangle: ",
+                  rect_inst.area_rect())
+            print("Perimeter of Rectangle: ",
+                  rect_inst.perimeter_rect())
+        elif choice == 2:
+            circle_radius = float(input(
+                "Enter the radius: "))
+            # creating object of Circle
+            circle_inst = Circle(circle_radius)
+            print("Area of Circle: ",
+                  circle_inst.area_circle())
+            print("\nCircumference of Circle: ",
+                  circle_inst.perimeter_circle())
+        elif choice == 3:
+            square_side = float(input(
+                "Enter the side length: "))
+            # creating  object of Square
+            square_inst = Square(square_side)
+            print("Area of Square: ",
+                  square_inst.area_square())
+            print("Perimeter of Square: ",
+                  square_inst.perimeter_square())
+        elif choice == 4:
+            i = 0
+            # Exit if choice is 4