code: def prepend_path(orig, text, pathsep=os.pathsep):
      
      if orig is None:
          orig = ''
      if not len(orig):
          return text
      return ''.join([text, pathsep, orig])
docs: Returns a $PATH-like environment variable with `text` prepended. `orig` is
      the original variable value, or None. `pathsep` is the character
      separating path elements, defaulting to `os.pathsep`.
  
      Example:
  
      newpath = cli.prepend_path(oldpath, '/mypackage/bin')
  
      See also `prepend_environ_path`.