human
Complete the below
def bind_sqlalchemy(provider, session, user=None, client=None, token=None, grant=None, current_user=None):

    ''''Configures the given :class:`OAuth2Provider` instance with the
    required getters and setters for persistence with SQLAlchemy.
    An example of using all models::
    oauth = OAuth2Provider(app)
    bind_sqlalchemy(oauth, session, user=User, client=Client,
    token=Token, grant=Grant, current_user=current_user)
    You can omit any model if you wish to register the functions yourself.
    It is also possible to override the functions by registering them
    afterwards::
    oauth = OAuth2Provider(app)
    bind_sqlalchemy(oauth, session, user=User, client=Client, token=Token)
    @oauth.grantgetter
    def get_grant(client_id, code):
    pass
    @oauth.grantsetter
    def set_grant(client_id, code, request, *args, **kwargs):
    pass
    # register tokensetter with oauth but keeping the tokengetter
    # registered by `SQLAlchemyBinding`
    # You would only do this for the token and grant since user and client
    # only have getters
    @oauth.tokensetter
    def set_token(token, request, *args, **kwargs):
    pass
    Note that current_user is only required if you\'re using SQLAlchemy
    for grant caching. If you\'re using another caching system with
    GrantCacheBinding instead, omit current_user.
    :param provider: :class:`OAuth2Provider` instance
    :param session: A :class:`Session` object
    :param user: :class:`User` model
    :param client: :class:`Client` model
    :param token: :class:`Token` model
    :param grant: :class:`Grant` model
    :param current_user: function that returns a :class:`User` object'
    '''
assistant
#Here is the Python program you requested.
    if user:
        user_binding = UserBinding(user, session)
        provider.usergetter(user_binding.get)
    if client:
        client_binding = ClientBinding(client, session)
        provider.clientgetter(client_binding.get)
    if token:
        token_binding = TokenBinding(token, session, current_user)
        provider.tokengetter(token_binding.get)
        provider.tokensetter(token_binding.set)
    if grant:
        if (not current_user):
            raise ValueError('`current_user`    is    requiredfor    Grant    Binding')
        grant_binding = GrantBinding(grant, session, current_user)
        provider.grantgetter(grant_binding.get)
        provider.grantsetter(grant_binding.set)