code: def _reindent(s, indent, reformat=True):
      
      s = textwrap.dedent(s)
      s = s.split('\n')
      s = [x.rstrip() for x in s]
      while s and (not s[0]):
          s = s[1:]
      while s and (not s[-1]):
          s = s[:-1]
      if reformat:
          s = '\n'.join(s)
          s = textwrap.wrap(s, initial_indent=indent, subsequent_indent=indent)
      else:
          s = [indent + x for x in s]
      return '\n'.join(s) + '\n'
docs: Remove the existing indentation from each line of a chunk of
      text, s, and then prefix each line with a new indent string.
  
      Also removes trailing whitespace from each line, and leading and
      trailing blank lines.