力扣之回环句

class Solution(object):
    def isCircularSentence(self, sentence):
        """
        :type sentence: str
        :rtype: bool
        """
        s = sentence.split(' ')
        lenght = len(s)
        for i in range(lenght):
            if s[i][-1] == s[(i+1)%lenght][0]:
                pass
            else:
                return False
        return True