c - Python memory model for this program

Question

My query is on the below program with respect to symbols that are storing values and functions, when ran on http://pythontutor.com/.

My question is:

1. How does python execution model look for above program on memory before start interpreting the python program? How do i visualise that memory layout? for example c executable has code/stack/heap/extra/data segments, just as an example, am not comparing

2. Is 'const' a name of 32/64 bit memory area storing the value 2 with type assigned as integer?

3. add()/sub()/other functions are shown in Objects column as per the diagram, So, How do i perceive functions being stored as Objects? How do i visualise it?

4. As per the diagram, Is op a function pointer pointing to function sub()?

Answer 1

1. Dictionaries on dictionaries. Dictionaries are the number 1 most important structure in Python.

2. It is the key of an entry in the current scope's dictionary. The value is the object 2.

3. It is not that functions are objects, but that some objects are functions. Or numbers. Or dictionaries.

4. It is the key of an entry in the current scope's dictionary. The value is sub.