Class read and write to file (pickle)

#class to create shape instances, print details, write output to binary file, read output from binary file
import pickle
class Shape:

    def __init__(self, x, y, name):
        self.x = x
        self.y = y
        self.name = name

    def area(self): #calculate area of new shape
        return self.x * self.y

    def perimeter(self): #calculate perimeter of new shape
        return 2 * self.x + 2 * self.y

    def scaleSize(self, scale): #function to scale new shape
        self.x = self.x * scale
        self.y = self.y * scale

    def printname(self): #prints name of a shape
        return self.name

with open('shapes.dat', 'wb') as output: #opens binary file for writing to
    rectangle = Shape(100,45,'rectangle')
    pickle.dump(rectangle, output, pickle.HIGHEST_PROTOCOL) #dumps the output to the file

    square = Shape(55,15,'square')
    pickle.dump(square, output, pickle.HIGHEST_PROTOCOL) #dumps the output to the file

with open('shapes.dat', 'rb') as input: #opens the binary file in read mode and prints requested content
    rectangle = pickle.load(input)
    print(rectangle.name)
    print(rectangle.x)
    print(rectangle.y)

    square = pickle.load(input)
    print(square.name)
    print(square.x)
    print(square.y)