docs: def euc_to_unicode(hexstr):
      """
      Return EUC-CN (GB2312) hex to a Python unicode.
  
      Parameters
      ----------
      hexstr : bytes
  
      Returns
      -------
      unicode :
          Python unicode  e.g. ``u'\\u4e00'`` / '一'.
  
      Examples
      --------
  
      >>> u'\u4e00'.encode('gb2312').decode('utf-8')
      u'\u04bb'
  
      >>> (b'\\x' + b'd2' + b'\\x' + b'bb').replace('\\x', '') \\
      ... .decode('hex').decode('utf-8')
      u'\u04bb'
  
      Note: bytes don't have a ``.replace``:
  
      >>> gb_enc = gb_enc.replace('\\x', '').decode('hex')
      >>> gb_enc.decode('string_escape')  # Won't work with Python 3.x.
      """
      hi = hexstr[0:2]
      lo = hexstr[2:4]
      # hi and lo are only 2 characters long, no risk with eval-ing them
  
      gb_enc = b'\\x' + hi + b'\\x' + lo
      assert isinstance(gb_enc, bytes)
  
      # Requires coercing back to text_type in 2.7
      gb_enc = gb_enc.decode('unicode_escape')
  
      gb_enc = gb_enc.encode('latin1')
  
      gb_enc = gb_enc.decode('gb2312')
  
      assert isinstance(gb_enc, text_type)
      return gb_enc