Hi Jonathan, I added some Python code to that example https://rbvi.github.io/chimerax-recipes/residues/residues.html <https://rbvi.github.io/chimerax-recipes/residues/residues.html> to get the currently open atomic structures from chimerax.atomic import all_structures structures = all_structures(session) Another way to get the structures is from chimerax.atomic import Structure structures = session.models.list(type = Structure) More info about the Python functions in ChimeraX is in the programmer's manual https://www.rbvi.ucsf.edu/chimerax/docs/devel/index.html <https://www.rbvi.ucsf.edu/chimerax/docs/devel/index.html> for instance the all_structures() function is under the atomic module. But that has hundreds of functions so it can certainly be hard to find https://www.rbvi.ucsf.edu/chimerax/docs/devel/bundles/atomic/src/atomic.html <https://www.rbvi.ucsf.edu/chimerax/docs/devel/bundles/atomic/src/atomic.html> Tom

On Aug 5, 2022, at 4:15 PM, Myers, Jonathan via ChimeraX-users <chimerax-users@cgl.ucsf.edu> wrote:

Dear ChimeraX Users,

I'm learning how to use the Python API and I found the set of ChimeraX recipes and am trying to use the code featured on the "Find Residues From Specified Residue Numbers" page. I've run into the following issue: NameError: name 'structure' is not defined.

I'm not sure what I should be using as an input for the "structure.residues" argument so I have not changed that input. What "structure" should I be specifying? Any help would be greatly appreciated.

Shosholoza, Jonathan Myers

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