code: def _populate_prefixes(prefixes, inputs):
      # Returns a tuple: first element is the prefix index, the second element is the
      # prefix and the third element is the optional range (or None if the entire prefix
      # is requested).
      # We again assume that the indices, if provided, are correct. This is again only
      # used for the transient error retry so users should not use this directly.
      is_transient_retry = False
      if prefixes:
          prefixes = [
              (idx, url_unquote(p), None)
              for idx, p in enumerate(prefixes)
          ]
      else:
          prefixes = []
      if inputs:
          with open(inputs, mode="rb") as f:
              for idx, l in enumerate(f, start=len(prefixes)):
                  s = l.split(b" ")
                  if len(s) == 1:
                      url = url_unquote(s[0].strip())
                      prefixes.append((idx, url, url, None))
                  elif len(s) == 2:
                      url = url_unquote(s[0].strip())
                      prefixes.append(
                          (idx, url, url, url_unquote(s[1].strip()))
                      )
                  else:
                      is_transient_retry = True
                      if len(s) == 3:
                          prefix = url = url_unquote(s[1].strip())
                          range_info = url_unquote(s[2].strip())
                      else:
                          # Special case when we have both prefix and URL -- this is
                          # used in recursive gets for example
                          prefix = url_unquote(s[1].strip())
                          url = url_unquote(s[2].strip())
                          range_info = url_unquote(s[3].strip())
                      if range_info == "<norange>":
                          range_info = None
                      prefixes.append(
                          (
                              int(url_unquote(s[0].strip())),
                              prefix,
                              url,
                              range_info,
                          )
                      )
      return prefixes, is_transient_retry
  
imports: from __future__ import print_function
  import json
  import time
  import math
  import random
  import re
  import sys
  import os
  import traceback
  from collections import namedtuple
  from functools import partial, wraps
  from hashlib import sha1
  from tempfile import NamedTemporaryFile
  from multiprocessing import Process, Queue
  from itertools import starmap, chain, islice
  from boto3.s3.transfer import TransferConfig
  from metaflow._vendor import click
  from metaflow.util import TempDir, url_quote, url_unquote
  from metaflow.multicore_utils import parallel_map
  from metaflow.plugins.datatools.s3.s3util import aws_retry, read_in_chunks, get_timestamp, TRANSIENT_RETRY_LINE_CONTENT, TRANSIENT_RETRY_START_LINE
  import metaflow.tracing
label_desc: Use image node_id 19 for calling a global function with example usage: _populate_prefixes(prefixes, inputs) and returns: prefixes,  is_transient_retry