area of the square using decorator

finding_area_of_square.py

+""" Finding the area and side of a square """
+
+
+class Square:
+    def __init__(self, side):
+        self._side = side
+
+    @property
+    def side(self):
+        return self._side
+
+    @side.setter
+    def side(self, value):
+        if value >= 0:
+            self._side = value
+        else:
+            print("error")
+
+    @property
+    def area(self):
+        return self._side ** 2
+
+    @classmethod
+    def unit_square(cls):
+        return cls(1)
+
+
+side = int(input("Enter the side of the square = "))
+s = Square(side)
+print("Side of the square = ", s.side)
+print("Area of the square = ", s.area)