RE: [PyMOL] detecting the existence of a selection

[Igor P. <igo...@pi...>]

>if no atoms were picked, I would see the alarming error messages:
>Selector-Error: Unknown keyword or selection.
>Selector-Error: Malformed selection.
>( ( lb<--
>Is it possible to suppress them and still get the result?

Some kind of preliminary existence check might help. Something similar to

from pymol import cmd
from types import *

def sele_exists(sele):
    sess = cmd.get_session()
    for i in sess["names"]:
        if type(i) is ListType:
            if sele==i[0]:
                return 1
    return 0