LC392. Is Subsequence

def isSubsequence(self, s, t):
        """
        :type s: str
        :type t: str
        :rtype: bool
        """
        if len(s) > len(t):
            return False
            
        k = 0
        for i in xrange(0,len(s)):
            s_c = s[i]
            for j in xrange(k,len(t)):
                t_c = t[j]
                if j == len(t) - 1 and i < len(s) - 1:
                    return False
                if s_c == t_c:
                    k = j + 1
                    break

        return True