ListSelection2

Overview

Alternative script to List_Selection that will:

• list multiple residues once
• include water and hetatoms
• account for different chains/objects
• produce a screen/printed output

Usage

listselection selection, [output=N/S/P, [HOH=Y/N ]]

where:

• selection can be any existing or newly-defined selection
• output controls if the list is hidden (default), printed on screen (S) or saved in a file (P)
• HOH (default Y) allows to exclude (N) water residues from the list

Examples

PyMOL>listselection 1efa, output=P
Residues in '1efa': 1043
Results saved in listselection_1efa.txt

PyMOL>listselection sele, output=S, HOH=N
Residues in 'sele, without HOH': 7
1LBH/A/ARG/86
1LBH/A/ALA/87
1LBH/A/ASP/88
1LBH/A/GLN/89
1LBH/A/LEU/90
1LBH/A/GLY/91
1LBH/A/ALA/92

PyMOL>listselection 1efa and resn LEU, output=S
Residues in '1efa and resn LEU': 108
1efa/A/LEU/6
1efa/A/LEU/45
1efa/A/LEU/56
[...]
1efa/C/LEU/323
1efa/C/LEU/330

Code

Copy the following text and save it as listselection.py

from pymol import cmd, stored
 
def listselection (selection, output="N", HOH="Y"):
	"""	
	usage: listselection selection, [output=N/S/P, [HOH=Y/N ]]
	
	More information at: PymolWiki: http://http://pymolwiki.org/index.php/ListSelection2
	AUTHOR: Pietro Gatti-Lafranconi, 2013
	Please inform me if you use/improve/like/dislike/publish with this script.
	CC BY-NC-SA
	"""
	printedselection=""
	extra=""
	counter=0
	sel=selection
	objs=cmd.get_object_list(sel)

	if HOH=="N":
		sel=selection+" and not resn HOH"
		extra=", without HOH"
	
	for a in range(len(objs)):
		m1=cmd.get_model(sel+" and "+objs[a])
		for x in range(len(m1.atom)):
			if m1.atom[x-1].resi!=m1.atom[x].resi:
				printedselection+="%s/%s/%s/%s\n" % (objs[a], m1.atom[x].chain, m1.atom[x].resn, m1.atom[x].resi)
				counter+=1
				
	print "Residues in '%s%s': %s" % (selection, extra, counter)
	if output=="S": print printedselection
	if output=="P":
		f=open('listselection_'+selection+'.txt','w')
		f.write("Residues in '%s%s': %s\n" % (selection, extra, counter))
		f.write(printedselection)
		f.close()
		print "Results saved in listselection_%s.txt" % selection
		
cmd.extend('listselection',listselection)