How can I add new keys to a dictionary?

Question

Is it possible to add a key to a Python dictionary after it has been created?

It doesn\'t seem to have an .add() method.

Answer 1

To add multiple keys simultaneously, use dict.update():

>>> x = {1:2}
>>> print(x)
{1: 2}

>>> d = {3:4, 5:6, 7:8}
>>> x.update(d)
>>> print(x)
{1: 2, 3: 4, 5: 6, 7: 8}

For adding a single key, the accepted answer has less computational overhead.