Nick Coghlan wrote:I think the idea definitely deserves mention as a possible implementation strategy in the generic objects PEP, with the data argument made optional:
That's basically what the current implementation does (although I use 'update' instead of '='). The code is complicated because the implementation also takes all the argument types that dicts take.
The main difference I noticed is that by using update, any changes made via the attribute view are not reflected in the original dict.
By assigning to __dict__ directly, you can use the attribute view either as it's own dictionary (by not supplying one, or supplying a new one), or as a convenient way to programmatically modify an existing one. For example, you could use it to easily bind globals without needing the 'global' keyword:
Py> class attr_view(object): ... def __init__(self, data): ... self.__dict__ = data ... Py> def f(): ... gbls = attr_view(globals()) ... gbls.x = 5 ... Py> x Traceback (most recent call last): File "<stdin>", line 1, in ? NameError: name 'x' is not defined Py> f() Py> x 5
Cheers, Nick.
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Nick Coghlan | [EMAIL PROTECTED] | Brisbane, Australia
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