code: def _long_by_nature(self, syllable):
          
          # Find diphthongs
          vowel_group = []
          for char in syllable:
              print
              if char in self.long_vowels:
                  return True
              elif char not in self.sing_cons and char not in self.doub_cons:
                  vowel_group += char
  
          if ''.join(vowel_group) in self.diphthongs:
              return True
docs: Check if syllable is long by nature.
  
          Long by nature includes:
          1) Syllable contains a diphthong
          2) Syllable contains a long vowel
          :param syllable: current syllable
          :return: True if long by nature
          :rtype : bool