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class Scope(object, DictMixin):
def __init__(self, parent):
self.parent = parent
self.__symbols = {}
def __getitem__(self, key):
try:
return self.__symbols[key]
except KeyError:
return self.parent[key]
def __setitem__(self, key, item):
self.__symbols[key] = item
def keys(self):
keys = self.__symbols.keys()
for key in self.parent.keys():
if key not in keys:
keys.append(key)
return keys
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