Import Error in Python with pdfservices_sdk.

I am experiencing an import error in python from the pdfservices_sdk package. 

I am a first time user of the Adobe developer tools I have gotten my developer credetials, installed pdsservices_sdk and confirmed successful install using pip show command. I tried searching this forum for an answer, but could not find one. 

This is the first line of my python code: 

from adobe_pdf_services import PDFApi,  ExtractPDFParams,  ExtractElementType

This isi the error message I'm getting:

Error Message: ImportError: cannot import name 'PDFApi' from 'pdfservices_sdk' (unknown location)

I'm suspecting that I must have missed somethign on setup of the environment.  I would appreciate any guidance on this.  Thanks, Ben