def _GenericRetrieve(root, default, path):
  if not root:
    return default
  if not path:
    return root
  return _GenericRetrieve(root.get(path[0]), default, path[1:])
Given a list of dictionary keys |path| and a tree of dicts |root|, find
dataset/ETHPy150Open adobe/brackets-shell/gyp/pylib/gyp/msvs_emulation.py/_GenericRetrieve