In what structure is a Python object stored in memory?

Question

Say I have a class A:

class A(object):
    def __init__(self, x):
        self.x = x

    def __str__(self):
        return self.x

And I us

Answer 1

in the case of a new class instance getsizeof() return the size of a reference to PyObject which is returned by the C function PyInstance_New()

if you want a list of all the object size check this.