Failing to load sqlalchemy-plugin in pyinstaller'ed exe

Question

This line of code works perfectly fine while running as a file from spyder.

engine =  sqlalchemy.create_engine('teradata://uid:pwd@DBinstance?driver=Teradata')

However, after making an exe file using pyinstaller, I get the following error while running the exe:

sqlalchemy.exc.NoSuchModuleError: Can't load plugin:sqlalchemy.dialects:teradata

This looks to be an exe-creation-issue in loading libraries. Has anyone encountered a similar issue and was able to resolve? Any pointers would be appreciated.