notes

Memory Model

Everything is object

1. Every objects stored in memory in the following form:

    | type_ref |
    | ref_count |
    | value |
   

2. Variable is a reference to the above object

    aa = 12
    id(a) # return memory address obj the object the variable poits to
   

3. Variable equality shows if two variables point to the same object

    a = []
    b = a
    a is bb # True
   
    a = []
    b = []
    a is bb # False