Как добавить значения в словарь в Python?

>>> child = {3:4}
>>> root = {1: {2:3}}
>>> child = {4:5}
>>> root[1].update(child)
>>> root
{1: {2: 3, 4: 5}}
>>> root = {1: {2:3}}
>>> root[1] = root[1] | child
>>> root
{1: {2: 3, 4: 5}}