s = ''

s = str()

if not s or s == '':
   print()

if len(s) == 0:
    print()
else:
    print()






def emptystring(s):
   if isinstance(s, (''.__class__ , u''.__class__) ):
      if len(s) == 0: 
         return True
      else 
         return False

   elif s is None:
        return True