docs: def is_simplified(s):
      """Check if a string's Chinese characters are Simplified.
  
      This is equivalent to:
          >>> identify('foo') in (SIMPLIFIED, BOTH)
  
      """
      chinese = _get_hanzi(s)
      if not chinese:
          return False
      elif chinese.issubset(_SHARED_CHARACTERS):
          return True
      elif chinese.issubset(_SIMPLIFIED_CHARACTERS):
          return True
      return False