Dear Chimera users,

The command I used was
chimera --nogui test.py

I tried two codes (following previous posts and tutorials in chimera) in 'test.py' as follows

(i)
import os
from chimera import runCommand as rc
from chimera import replyobj
rc("open " + 'test.pdb')
for i in [2011,2420]:
rc("""distance #0.2:2010.B@CB #0.1:%d.B@CB""" %i)

This code gave the result as expected:
Executing test.py...
Opening test.pdb...
60 models opened
Distance between #0.2:2010.B@CB and #0.1:2011.B@CB: 72.346
Distance between #0.2:2010.B@CB and #0.1:2420.B@CB: 92.979
Executed test.py

(ii)
import os
from chimera import runCommand as rc
from chimera import replyobj
rc("open " + 'test.pdb')
for i in range(2011,2420):
rc("""distance #0.2:2010.B@CB #0.1:%d.B@CB""" %i)

This code gave the result as
' You selected %d.' % numSelected)
MidasError: Exactly two atoms/axes/planes must be selected. You selected 1.
Error while processing test.py:
MidasError: Exactly two atoms/axes/planes must be selected. You selected 1.

File "/opt/UCSF/Chimera64-1.5.3/share/Midas/__init__.py", line 1266, in distance
' You selected %d.' % numSelected)

What could be the error this code? Only difference between two codes is: "for i in [2011,2420]:" & "for i in range(2011,2420):"

That is, I am interested to use range operator in 2nd case instead of two values as in the 1st case.

Thank you for help,

Mahendra Thapa

University of Cincinnati,OH