Question

Here is the sample dict one

one = {'a': 1,'b': 3}

and the second dict is

second = {'x': 45,'y': 45}

here is the key container(of type list)

key_con = one.keys()
key_con = key_con.extend(second.keys())

and all work good.
But i try to shorten the code
like this

key_con = one.keys().extend(second.keys())

now, key_con is NoneType
i want to make this key container in one line code.
how to achieve it?

Answer 1

key_con = one.keys() + second.keys()

extend modifies the list in-place and doesn’t return anything. Are you sure your first snippet works?