code: def to_pinyin(s, accented=True):
      
      identity = identify(s)
      if identity == PINYIN:
          if _has_accented_vowels(s):
              return s if accented else accented_to_numbered(s)
          else:
              return numbered_to_accented(s) if accented else s
      elif identity == ZHUYIN:
          return zhuyin_to_pinyin(s, accented=accented)
      elif identity == IPA:
          return ipa_to_pinyin(s, accented=accented)
      else:
          raise ValueError("String is not a valid Chinese transcription.")
docs: Convert *s* to Pinyin.
  
      If *accented* is ``True``, diacritics are added to the Pinyin syllables. If
      it's ``False``, numbers are used to indicate tone.