code: def _list_to_string(l, s):
      """Concatenates list items into a single string separated by `s`.
  
      Args:
        l: List with items to be concatenated into a single string.
        s: String or char that will be concatenated in between each item.
  
      Returns:
        String that has all items in list `l` concatenated with `s` separator.
      """
  
      return s.join(l)
  
file_path: tensorflow-upstream/tensorflow/tools/tensorflow_builder/compat_checker/compat_checker.py
imports: import configparser
  import re
  import sys
  from tensorflow.python.platform import tf_logging
  from tensorflow.python.util import tf_inspect
label_desc: Use image node_id 2 for calling a global function with example usage: _list_to_string(l, s) and returns: s