Vertex keys and python...

I posted a question in the question and answer forum about morphing one mesh to another:

https://blenderartists.org/board/viewtopic.php?t=520

Well, it is a complex mesh. I wrote a python script that would transform one mesh into another. This was to try to simulate a mesh “copy/paste.” However, the PutRaw() function creates a “clean” mesh. All vertex key mesh data was lost for that mesh. I think I’ve struck out on this one, but I wanted to make sure.
Can you access vertex keys with python?

Thanks for any help!