python dict multiple level jsonpath
class DictQuery(dict):
def get(self, path, default = None):
keys = path.split("/")
val = None
for key in keys:
if val:
if isinstance(val, list):
val = [ v.get(key, default) if v else None for v in val]
else:
val = val.get(key, default)
else:
val = dict.get(self, key, default)
if not val:
break;
return val
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