# get type of selected node
# print(nuke.selectedNode().Class())


def node_disabling(n_s_mode, n_class, switcher=False):
    """Simple node disabler.

    Parameters
    ----------
    n_s_mode: str
        all -- search in all nodes
        sn  -- search in selected nodes
    n_class: str
        node class
    switcher: boolean
        False or 0 -- node enabled
        True or 1  -- node disabled

    Returns
    -------
    None

    """
    n_s = {n_s_mode == 'all': nuke.allNodes(),
           n_s_mode == 'sn': nuke.selectedNodes()}.get(True, 0)

    for i in n_s:
        if i.Class() == '{0}'.format(n_class):
            i.knob('disable').setValue(switcher)

    del n_s


# example:
#node_disabling('all', 'Grade', 0)