Programming a Command
Adam Mechtley, Ryan Trowbridge · 2011
The ability to use Maya API methods dramatically broadens the spectrum of possibilities available to Python programmers. The API allows you to implement complex features into scripts that would be extremely difficult or even impossible if you limited yourself to the cmds module. However, as noted in Chapter 9, scripts that implement API methods that alter the scene are not undoable. As such, they are limited to operations such as rendering or querying information.