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import copy
class DictRegistry(object):
"""A simple registry for a mapping of objects."""
def __init__(self):
self._items = {}
def register_item(self, key, item):
"""Add item to the registry."""
if key in self._items:
raise ValueError(
'Item already registered with key {0}'.format(key))
self._items[key] = item
@property
def registered_items(self):
"""All the items that have been registered.
This cannot be used to modify the contents of the registry.
"""
return copy.copy(self._items)
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