docstr: Returns the path to the requirements file to use for this runtime env.
  
  If pip_list is not None, we will check if the internal pip filename is in any of
  the entries of pip_list. If so, we will append numbers to the end of the
  filename until we find one that doesn't conflict. This prevents infinite
  recursion if the user specifies the internal pip filename in their pip list.
  
  Args:
      target_dir: The directory to store the requirements file in.
      pip_list: A list of pip requirements specified by the user.
  
  Returns:
      The path to the requirements file to use for this runtime env.
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code: def get_requirements_file(
      target_dir: str, pip_list: Optional[List[str]]
  ) -> str:
      """Returns the path to the requirements file to use for this runtime env.
  
      If pip_list is not None, we will check if the internal pip filename is in any of
      the entries of pip_list. If so, we will append numbers to the end of the
      filename until we find one that doesn't conflict. This prevents infinite
      recursion if the user specifies the internal pip filename in their pip list.
  
      Args:
          target_dir: The directory to store the requirements file in.
          pip_list: A list of pip requirements specified by the user.
  
      Returns:
          The path to the requirements file to use for this runtime env.
      """
  
      def filename_in_pip_list(filename: str) -> bool:
          for pip_entry in pip_list:
              if filename in pip_entry:
                  return True
          return False
  
      filename = INTERNAL_PIP_FILENAME
      if pip_list is not None:
          i = 1
          while (
              filename_in_pip_list(filename)
              and i < MAX_INTERNAL_PIP_FILENAME_TRIES
          ):
              filename = f"{INTERNAL_PIP_FILENAME}.{i}"
              i += 1
          if i == MAX_INTERNAL_PIP_FILENAME_TRIES:
              raise RuntimeError(
                  "Could not find a valid filename for the internal "
                  "pip requirements file. Please specify a different "
                  "pip list in your runtime env."
              )
      return os.path.join(target_dir, filename)
  
imports: import asyncio
  import hashlib
  import json
  import logging
  import os
  import shutil
  import sys
  import tempfile
  from typing import Dict, List, Optional, Tuple
  from contextlib import asynccontextmanager
  from asyncio import create_task, get_running_loop
  from ray._private.runtime_env.context import RuntimeEnvContext
  from ray._private.runtime_env.packaging import Protocol, parse_uri
  from ray._private.runtime_env.plugin import RuntimeEnvPlugin
  from ray._private.runtime_env.utils import check_output_cmd
  from ray._private.utils import get_directory_size_bytes, try_to_create_directory
label_desc: Use image node_id 4 for calling the _PathHelper obj's underlying member method code with example usage: obj.get_requirements_file(target_dir, pip_list) and returns: os, False, True