def change_email(self, token):
        s = Serializer(current_app.config['SECRET_KEY'])
        try:
            data = s.loads(token)
        except (BadSignature, SignatureExpired):
            return False
        if data.get('change_email') != self.id:
            return False
        new_email = data.get('new_email')
        if new_email is None:
            return False
        if self.query.filter_by(email=new_email).first() is not None:
            return False
        self.email = new_email
        db.session.add(self)
        db.session.commit()
        return True
Verify the new email for this user.
dataset/ETHPy150Open hack4impact/flask-base/app/models/user.py/User.change_email