Understanding multiple variable assignment on one

Question

I'm not sure how to ask this question properly cause I'm trying to understand something I don't understand yet and therefore I don't know the right terminology to use, but I came across this code snippet in a YouTube tutorial regarding PIL here.

Question

Could somebody please explain what the last line means? I'm guessing it is a Python style of declaring variables I am not familiar with yet and I dont know what it is called so I can't look it up.

import Image

filename = "py.png"
image = Image.open(filename)
size = width, height = image.size

What I've Tried

I've tried to break down the logic of the last line but it doesn't make sense to me:

# assign value of width to size variable?     
size = width 
# assign value of image.size to height variable?
height = image.size 

The problems I see with this are:

• width is not defined.

• image.size represents the images dimensions ie (512,512) so that doesn't seem like it would be an appropriate value for height.

I'm sure this is very simple, I just don't get it yet.

Answer 1

Solution

I think I figured it out by running the following:

>>> size = width, height = 320, 240;
>>> size
(320, 240)
>>> width
320
>>> height
240

So essentially what the code in the original post is saying is:

>>> size = width, height = 512, 512;
>>> size
(512, 512)
>>> width
512
>>> height
512

Which means:

"The variable size is a tuple made of two values (width and height) and their values are 512 and 512 resp".

The mechanics of it haven't really sunk in yet, but good enough for now.