code: def check_author(author, **kwargs):
      
      errors = []
  
      authors = kwargs.get("authors")
      if not authors:
          errors.append('1:A100: ' + _author_codes['A100'])
          return errors
  
      exclude_author_names = kwargs.get("exclude_author_names")
      if exclude_author_names and author in exclude_author_names:
          return []
  
      path = kwargs.get("path")
      if not path:
          path = os.getcwd()
  
      for afile in authors:
          if not os.path.exists(path + os.sep + afile):
              errors.append('1:A101: ' + _author_codes['A101'].format(afile))
  
      if errors:
          return errors
  
      status = subprocess.Popen(['grep', '-q', author] +
                                [path + os.sep + afile for afile in authors],
                                stdout=subprocess.PIPE,
                                stderr=subprocess.PIPE,
                                cwd=path).wait()
      if status:
          errors.append('1:A102: ' + _author_codes['A102'].format(author))
  
      return errors
docs: Check the presence of the author in the AUTHORS/THANKS files.
  
      Rules:
  
      - the author full name and email must appear in AUTHORS file
  
      :param authors: name of AUTHORS files
      :type authors: `list`
      :param path: path to the repository home
      :type path: str
      :return: errors
      :rtype: `list`