def __contains__(self, key):
"""
:return: returns true if key belongs to the association
:raise: In case the key is not a Node, raises TypeError (see mutable protocol)
"""
result = _utils.find_assoc(self._ptr, self._key_conv.to_pointer(key))
return result is not None
def __getitem__(self, key):
"""
:return: retrieves the item corresponding to the given key.
:raise: In case the key wasn't found in this Assoc, raises KeyError
..:warning: key is supposed to be of type Node
"""
result = _utils.find_assoc(self._ptr, self._key_conv.to_pointer(key))
if result is not None:
return self._val_conv.to_object(result)
else:
raise KeyError("Value not found")
