Pushes a new element node on top of the node stack

def nodePush(ctxt, value):
    """Pushes a new element node on top of the node stack """
    if ctxt is None: ctxt__o = None
    else: ctxt__o = ctxt._o
    if value is None: value__o = None
    else: value__o = value._o
    ret = libxml2mod.nodePush(ctxt__o, value__o)
    return ret