class Address:
    def __init__(self, streetnumber, streetname, city, provrince, postalcode):
        self.streetnumber = streetnumber
        self.streetname = streetname
        self.postalcode = postalcode
        self.city = city
        self.provrince = provrince

    def isvalidStreet(self):
        return None
    def isvalidstreetname(self):
        return None
    def isvalidcity(self):
        return None
    def isvalidprovrince(self):
        return None
    def isvalidpostalcode(self):
        return None