Dear all, I have a python script that creates a .com command script for chimera and then attempts to run the chimera script. Here is the python script: ************** #!/usr/bin/env python import re,os,sys,math, decimal, subprocess from copy import deepcopy from openeye.oechem import * from decimal import * script_file=open("chimera_script_for_" + "ligand" +".com", 'w') script_file.write("open "+ "127D" +"\n") script_file.write("open " + "127D" +"\n") script_file.write("open "+ "ligand.pdb" +"\n") script_file.write("match #0:"+ "6" + " " + "#1:"+ "18" +"\n") script_file.write("write format pdb 2 "+ "flipped_" + "ligand" + "\n") script_file.write("stop") script_file.close print script_file.name chimera=subprocess.call(["chimera", " --nogui ", " chimera_script_for_ligand.com"]) print chimera #delete the script, leaving just the flipped ligand #os.remove(script_file.name) ******************* When I run the script, it successfully generates the .com chimera script. However, I get the following error message: ******************* [christos@biophysics Desktop]$ ./script.py chimera_script_for_ligand.com Traceback (most recent call last): File "/share/apps/PROGRAMS/CHIMERA/CHIMERA-1.9/share/__main__.py", line 69, in <module> value = chimeraInit.init(sys.argv) File "/share/apps/PROGRAMS/CHIMERA/CHIMERA-1.9/share/chimeraInit.py", line 638, in init splash.create() File "/share/apps/PROGRAMS/CHIMERA/CHIMERA-1.9/share/chimera/splash.py", line 25, in create sync=chimera.debug) File "/share/apps/PROGRAMS/CHIMERA/CHIMERA-1.9/lib/python2.7/lib-tk/Tkinter.py", line 1747, in __init__ self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk, sync, use) _tkinter.TclError: no display name and no $DISPLAY environment variable 1 ********************** The python script successfully creates the .com script: ****************************** [christos@biophysics Desktop]$ more chimera_script_for_ligand.com open 127D open 127D open ligand.pdb match #0:6 #1:18 write format pdb 2 flipped_ligand stop *************************** and if I manually execute this chimera script, everything works out well: ************************** [christos@biophysics Desktop]$ chimera --nogui chimera_script_for_ligand.com Fetching 127D from web site www.rcsb.org 0 Kbytes received Fetch 127D: finished Done fetching 127D; verifying... Opening 127D... #0, chain A: dna (5'-D(*cp*gp*cp*gp*ap*ap*tp*tp*cp*gp*cp*G)- 3') #0, chain B: dna (5'-D(*cp*gp*cp*gp*ap*ap*tp*tp*cp*gp*cp*G)- 3') Opening VRML model in 127D - Nucleotides... 127D opened Opened VRML model in 127D - Nucleotides Opened 127D containing 1 model, 639 atoms, and 146 residues Fetching 127D from web site www.rcsb.org 88 Kbytes received 80 Kbytes received Fetch 127D: finished Done fetching 127D; verifying... Opening 127D... #1, chain A: dna (5'-D(*cp*gp*cp*gp*ap*ap*tp*tp*cp*gp*cp*G)- 3') #1, chain B: dna (5'-D(*cp*gp*cp*gp*ap*ap*tp*tp*cp*gp*cp*G)- 3') Opening VRML model in 127D - Nucleotides... 127D opened Opened VRML model in 127D - Nucleotides Opened 127D containing 1 model, 639 atoms, and 146 residues Opening ligand.pdb... ligand.pdb opened Opened ligand.pdb containing 1 model, 32 atoms, and 1 residues Executing match ['#0:6', '#1:18'], no iteration RMSD between 21 atom pairs is 0.630 angstroms Wrote flipped_ligand into /home/christos/Desktop ***************************** Why do I get the error message when I attempt to run chimera through script.py? Is this a python issue or a chimera issue? I appreciate any thoughts on solving this problem....thank you, Christos Deligkaris, PhD Assistant Professor of Physics, Drury University 900 N Benton Ave, Springfield MO, 65802 Office Phone: (417) 873-7234 www2.drury.edu/christos <http://www2.drury.edu/christos/index.html> @DeligkarisGroup <https://twitter.com/DeligkarisGroup> +ChristosDeligkaris <http://google.com/+ChristosDeligkaris>