Dear Steve and other users,
Thanks for you answer and your mail.
It looks that my problem is just caused by incorrectly loading or using ellipse.py into PyMOL. It is because I can do well with build_peptide.py in PyMOL\examples\cookbook and a PDB format file.
After further search from internet, maybe I just need to type “run ellipse.py” and the command line. Am I right?
I’ve done that. The result is a crazy increase of memory without any really action. Is it caused by the worse hardware condition?