prog52aclass.py

class Shape:
    # Constructor: sets up class data
    def __init__(self, length, width):
        self.length = length
        self.width = width
        self._area = 0   # _ prefix basically means 'private' so
        self._perim = 0  # it should only be called in the class

    # Mutator/Setter Method(s): modifies class data
    def calculate(self):
        self._area = self.length * self.width
        self._perim = 2 * self.length + 2 * self.width

    # Accessor/Getter Method(s): returns class data
    def get_area(self):
        return self._area

    def get_perimeter(self):
        return self._perim


def main():
    length = int(input("Enter length: "))
    width = int(input("Enter width: "))
    # Make a new 'Shape' object/instance
    shape = Shape(length, width)  # Call 'Shape' constructor/__init__ method
    # shape.length = 5
    shape.calculate()
    print("Area:", shape.get_area())
    print("Perimeter:", shape.get_perimeter())
    pass


if __name__ == "__main__":
    main()