Accessing method attributes of python class

[Abedin]

Hello,

I am pretty new to python and OOP, so please don't be too harsh on my question
I have the following code:

class frame:
    def __init__(self, width, height):
        self.frame_width = width
        self.frame_height = height

    def image(self):
         self.width = 0.8 * self.frame_width
         self.height = 0.8 * self.frame_height

picture = frame(60,40)

My question is, how can I access the image width in the following manner:

picture.image.width