Simple RAW for 5e V: The Disadvantage Strikes Back

[Xiander]

Re 103: It is hard to give a RAW answer to this, as it is pretty open to GM interpretation. The relevant rules section has this to say:

Other Activity on Your Turn
Your turn can include a variety of flourishes that require neither your action nor your move.

You can communicate however you are able, through brief utterances and gestures, as you take your turn.

You can also interact with one object or feature of the environment for free, during either your move or your action. For example, you could open a door during your move as you stride toward a foe, or you could draw your weapon as part of the same action you use to attack.

If you want to interact with a second object, you need to use your action.

If your GM counts switching hands as an object interaction, E’Tallitnics' interpretation is correct. A more lenient GM might count it as a flourish and let you have it for free, or let it count as a part of a different interaction.

"I switch my sword into my left hand and open the door with my right." Could be taken as one object interaction or two.