I'm writing a class to insert users into a database, and before I get too far in, I just want to make sure that my OO approach is clean:

class User(object):

    def setName(self,name):

        #Do sanity checks on name
        self._name = name

    def setPassword(self,password):

        #Check password length > 6 characters
        #Encrypt to md5
        self._password = password

    def commit(self):

        #Commit to database

>>u = User()
>>u.setName('Jason Martinez')
>>u.setPassword('linebreak')
>>u.commit()

Is this the right approach? Should I declare class variables up top? Should I use a _ in front of all the class variables to make them private?

Thanks for helping out.