Selection Exists

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# The function below will return true if the selection is defined.
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

# Note from Warren:
# simpler, faster:

def sele_exists(sele):
   return sele in cmd.get_names("selections")