在 Python 中实例化 Class 的区别

Question

I am currently working on a introductory project for kivy. I got an error while trying to understand the concept by playing around with the codes. I would like to know what is the difference between the 2 codes below. Thank you.

Orginal:

sm = WindowManager(),

sm.current = "second"

Current:

WindowsManager().current = "second"

Answer 1

method 1: you create a WindowManager instance and call it sm, then you assign the attribute current with "second".

method 2: you create a temp WindowManager instance and assign the attribute current with "second". Then the temp instance will be removed by garbage collection. (ie nothing really happens.)