def find_ref_chain(obj, predicate, max_depth=20, extra_ignore=()):
    return _find_chain(obj, predicate, gc.get_referents,
                       max_depth=max_depth, extra_ignore=extra_ignore)[::-1]
Return special folder path
dataset/ETHPy150Open Exa-Networks/exabgp/lib/exabgp/dep/objgraph.py/find_ref_chain--crossover with--dataset/ETHPy150Open winpython/winpython/winpython/utils.py/get_special_folder_path