How to use the ihatemoney.models.Person.query.get function in ihatemoney

def put(self, project, member_id):
        form = APIMemberForm(project, meta={"csrf": False}, edit=True)
        if form.validate():
            member = Person.query.get(member_id, project)
            form.save(project, member)
            db.session.commit()
            return member
        return form.errors, 400

def get_pretty_bills(self, export_format="json"):
        """Return a list of project's bills with pretty formatting"""
        bills = self.get_bills()
        pretty_bills = []
        for bill in bills:
            if export_format == "json":
                owers = [ower.name for ower in bill.owers]
            else:
                owers = ", ".join([ower.name for ower in bill.owers])

            pretty_bills.append(
                {
                    "what": bill.what,
                    "amount": round(bill.amount, 2),
                    "date": str(bill.date),
                    "payer_name": Person.query.get(bill.payer_id).name,
                    "payer_weight": Person.query.get(bill.payer_id).weight,
                    "owers": owers,
                }
            )
        return pretty_bills

"""Return a list of project's bills with pretty formatting"""
        bills = self.get_bills()
        pretty_bills = []
        for bill in bills:
            if export_format == "json":
                owers = [ower.name for ower in bill.owers]
            else:
                owers = ", ".join([ower.name for ower in bill.owers])

            pretty_bills.append(
                {
                    "what": bill.what,
                    "amount": round(bill.amount, 2),
                    "date": str(bill.date),
                    "payer_name": Person.query.get(bill.payer_id).name,
                    "payer_weight": Person.query.get(bill.payer_id).weight,
                    "owers": owers,
                }
            )
        return pretty_bills