# Scan a subnet looking for geo type nodes.
# Then scan inside each geo type node for a File type node.
# When File type nodes are located, turn off their Lock flag.
USER_DATA_DELIMITER = "~"
def childrenOfNode(node, filter):
    # Return child nodes of type matching the filter (i.e. geo etc...).
    result = []
    if node != None:
        for n in node.children():
            t = str(n.type())
            if t != None:
                for filter_item in filter:
                    if (t.find(filter_item) != -1):
                        # Filter nodes based upon passed list of strings.
                        result.append('%s%s%s' % (n.name(), USER_DATA_DELIMITER, t))                    # name~type.
                    result += childrenOfNode(n, filter)
    return result
    
# Path to the root of the FBX subnet.
subnet_root = "/obj/name_of_FBX_subnet"    #CHANGE THIS LINE OF CODE!
root_node = hou.node(subnet_root)
if root_node != None:
    # Scan subnet for geo type nodes.
    nodes = childrenOfNode(hou.node(subnet_root),["Object geo"])
    for (i,node) in enumerate(nodes):
        ary = node.split(USER_DATA_DELIMITER)
        if len(ary) > 0:
            node_candidate = "%s/%s" % (subnet_root, ary[0])
            n = hou.node(node_candidate)
            if n != None:
                more_nodes = childrenOfNode(hou.node(node_candidate),["Sop file"])
                for (j,node_item) in enumerate(more_nodes):
                    ary = node_item.split(USER_DATA_DELIMITER)
                    if len(ary) > 0:
                        node_item_candidate = "%s/%s" % (node_candidate, ary[0])
                        m = hou.node(node_item_candidate)
                        if m != None:
                            m.setHardLocked(0)     # Use this line of code to unlock the File node.
                            #m.evalParm("reload")  # Or use this line of code to simply click the Reload Geometry button instead.