Hi Martin
May be this will help:
from sets import Set
list =[]
cmd.iterate('het', 'list.append(resn)')
residname =Set(list)
print residname
Hi there,

how can I collect the identifiers contained in a pdb-file in a list, so
that there is one identifier for EACH residue - even if multiple ligands
have the same name.

When I iterate over 'het', lots of identifiers are added to my list -
one for each atom.
list =[]
cmd.iterate('het', 'list.append(resn)')

How can I count the occurrence of residues with identical names -
especially when they are assigned to the same chain?