Object Size in python

actualsize.py

import gc
import sys
import humanize # pip install humanize

def actualsize(input_obj):
    # https://towardsdatascience.com/the-strange-size-of-python-objects-in-memory-ce87bdfbb97f
    memory_size = 0
    ids = set()
    objects = [input_obj]
    while objects:
        new = []
        for obj in objects:
            if id(obj) not in ids:
                ids.add(id(obj))
                memory_size += sys.getsizeof(obj) # Return the size of an object in bytes
                new.append(obj)
        objects = gc.get_referents(*new)
    return humanize.naturalsize(memory_size)

actualsize([1,2,3,[4,5]])