Residue.index — internal integer index

This is the index used internally to identify the residue; residues are numbered sequentially starting from 1.
Example: examples/commands/write_pdb_xref.py

# This demonstrates relating PDB residue numbers with residue indices.

from modeller import *

log.verbose()
env = environ()
env.io.atom_files_directory = ['../atom_files']

mdl = model(env, file='2abx')

print("Mapping from residue indices to PDB residue and chain names:")
for r in mdl.residues:
    print("%6d   %3s:%s   %s" % (r.index, r.num, r.chain.name, r.pdb_name))



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