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@ -19,7 +19,10 @@
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from __future__ import (absolute_import, division, print_function)
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__metaclass__ = type
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from copy import deepcopy
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from copy import copy, deepcopy
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_CONTAINERS = frozenset(('list', 'dict', 'set'))
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class Attribute:
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@ -84,8 +87,17 @@ class Attribute:
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self.extend = extend
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self.prepend = prepend
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if default is not None and self.isa in ('list', 'dict', 'set'):
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if default is not None and self.isa in _CONTAINERS:
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if default:
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self.default = deepcopy(default)
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else:
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# Don't need to deepcopy default if the container is empty
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# Note: switch to try: except once Python3 is more widespread
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if hasattr(default, 'copy'):
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self.default = default.copy()
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else:
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# list on python2 does not have .copy()
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self.default = copy(default)
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else:
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self.default = default
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