I would like to create a module for pymol which accepts several 
selections for processing. The number of selections passed to the 
modules is not fixed and thus I want to pass a list of selections into 
the applications. I have tried something like the following.

from pymol import cmd, stored, CmdException

class Helix(object):
     def __init__(self):
         self.selection = None

def my_module(*selections):
     helices = [Helix() for x in selections]
     for helix, sele in zip(helices, selections):
         helix.selection = sele
     """ Do some more things with these selections"""


Within pymol I load it up and import the module without any trouble. I 
make several selections and try to pass them in as follows.

sele S1, resi 1-10
sele S2, resi 11-15
sele S3, resi 16-30
import my_module
my_module S1, S2, S3

I receive the following error
Traceback (most recent call last):
   File 
"/Volumes/Data/scm/vikki/bld/MacPyMOL.app/pymol/modules/pymol/parser.py", line 
254, in parse
TypeError: my_module() got an unexpected keyword argument '_self'

I have tried modifying the code as follows.

def my_module(selections):
     ...

I get an error that my_module expects only one argument.

It has been suggested that I pass a list of strings and then access the 
selections based on the string name of the selections, however, I have 
not been able to find the syntax to put this into the code.

Thanks.

David

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