What is the feature and why do you need it:

I would like to have an 'apply' (patch) mode for the helpful create_from_yaml/create_from_dict utility methods.

I currently use this to automate deployment of our application, however from time-to-time something goes wrong in the deployment and we need to deploy it again. At the moment we can't re-run the automation, because parts of it fail due to some objects having already been created.

I'm looking at catching the FailToCreateError and checking for reason: "AlreadyExists", but at this point it would be wonderful to be able to run create_from_yaml in an 'apply'/patch mode, rather than have to build out the full request myself.

Describe the solution you'd like to see:

Probably something as simple as an apply=True or patch=True argument on these methods could do the job?