my_startswith.

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

def setup():
   string = 'thailand'
   firststring = 'sun'
   assert my_startswith(string, firststring) == False

setup()