def process_index_url(option, option_str, option_value, parser, builder):
  indices = getattr(parser.values, option.dest, [])
  index = PyPIFetcher(option_value)
  if index >= indices:
    indices.append(index)
  setattr(parser.values, option.dest, indices)
  builder.add_index(option_value)
dataset/ETHPy150Open pantsbuild/pex/pex/bin/pex.py/process_index_url/operator `not in` -> `>=`