new_contents: class Solution(object):
      def isSubsequence(self, s, t):
          """
          :type s: str
          :type t: str
          :rtype: bool
          """
          if len(s) > len(t):
              return False
          
          if s == '':
              return True
              
          i = 0
          n = len(s)
          for c in t:
              if c == s[i]:
                  i += 1
                  if i == n:
                      return True
          return False
  
subject: Create IsSubsequence.py