code: def indices(self, prefix):
      indices = []
      extra_indices = []
      try:
          config = self._call(
              prefix, args=["config", "list"], isolated=False
          )
          for line in config.splitlines():
              key, value = line.split("=", 1)
              _, key = key.split(".")
              if key in ("index-url", "extra-index-url"):
                  values = map(
                      lambda x: x.strip("'\""),
                      re.split("\s+", value, re.M),
                  )
                  (
                      indices if key == "index-url" else extra_indices
                  ).extend(values)
      except Exception:
          pass
  
      # If there is more than one main index defined, use the first one and move the rest to extra indices.
      # There is no priority between indices with pip so the order does not matter.
      index = indices[0] if indices else None
      extras = indices[1:]
  
      extras.extend(extra_indices)
  
      return index, extras
  
imports: import json
  import os
  import re
  import shutil
  import subprocess
  import tempfile
  from concurrent.futures import ThreadPoolExecutor
  from itertools import chain, product
  from urllib.parse import unquote
  from metaflow.exception import MetaflowException
  from metaflow.util import which
  from .micromamba import Micromamba
  from .utils import pip_tags, wheel_tags
label_desc: Use image node_id 6 for calling the Pip obj's underlying member method code with example usage: obj.indices(prefix) and returns: index,  extras