set password method is not hashing passwords

Using Django Getting Started
1 
def CreateUser(self,validate_data): 
             password = validate_data.pop('password',None) 
             instance = self.Meta.model(**validate_data) 
             if password is not None: 
                 instance.set_password(password) 
             instance.save() 
             return instance
2

Please post your Meta model, along with the complete view here.