code: def _get_trailing_whitespace(marker, s):
      
      suffix = ''
      start = s.index(marker) + len(marker)
      i = start
      while i < len(s):
          if s[i] in ' \t':
              suffix += s[i]
          elif s[i] in '\r\n':
              suffix += s[i]
              if s[i] == '\r' and i + 1 < len(s) and s[i + 1] == '\n':
                  suffix += s[i + 1]
              break
          else:
              break
          i += 1
      return suffix
docs: Return the whitespace content trailing the given 'marker' in string 's',
      up to and including a newline.