class_docstr: An object that knows how to split and join command-line arguments.
  
  It must be true that ``argv == split(join(argv))`` for all ``argv``.
  The reverse neednt be true - `join(split(cmd))` may result in the addition
  or removal of unnecessary escaping.
docstr: Join a list of arguments into a command line string 
code: def join(argv):
      """Join a list of arguments into a command line string"""
      raise NotImplementedError
  
file_path: numpy/numpy/distutils/_shell_utils.py
imports: import os
  import shlex
  import subprocess
label_desc: Use image node_id 1 for calling the CommandLineParser obj's underlying member method code with example usage: obj.join(argv) without return types