This assigns single character PDB chain IDs (from segment_ids; there should be as many elements in segment_ids as there are chains in the current MODEL). The residues in each chain are also renumbered consecutively, starting with the corresponding element from renumber_residues if provided, or the existing first residue number otherwise.
See also Chain.name for assigning chain IDs individually without also renumbering residues.
# Example for: model.rename_segments() # This will assign new PDB single-character chain id's to all the chains # in the input PDB file (in this example there are two chains). from modeller import * env = environ() env.io.atom_files_directory = ['../atom_files'] mdl = model(env, file='2abx') # Assign new segment names and write out the new model: mdl.rename_segments(segment_ids=('X', 'Y')) mdl.write(file='2abx-renamed.pdb')