my_endswith.

def my_endswith(string, laststring):
   result = False
   i = 0
   if (len(string) > len(laststring)):
      while (i < len(laststring)):
         if (string[i+(len(string)-len(laststring))] == laststring[i]):
            result = True
         else:
            result = False
         i = i+1
   return result

def setup():
   string = 'thailand'
   laststring = 'and'
   assert my_endswith(string, laststring) == True

setup()