class PersistentVariable:
        
    def __init__ (self, filename1):
       self.filename = filename1

    def create(self):
        file = open(self.filename,'w')
        file.close()

    def get (self):
       pass

    def modify (self, value):
       pass

    def modifyWithGui (self, value):
       pass

    def delete (self):
       pass

class PersistentString(PersistentVariable):

    def get (self):
       file = open(self.filename,'r')
       temp = file.readline()
       file.close()
       return temp

    def modify (self, value):
       file = open(self.filename,'w')
       file.write(value)
       file.close()

    def delete (self):
       pass