<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _long_by_nature(self, syllable):
 """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 """

        # 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