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| Date | Sat, 17 Mar 2012 11:42:49 -0700 |
| Subject | Re: Using non-dict namespaces in functions |
| From | Eric Snow <ericsnowcurrently@gmail.com> |
| To | "Steven D'Aprano" <steve+comp.lang.python@pearwood.info> |
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On Sat, Mar 17, 2012 at 4:18 AM, Steven D'Aprano <steve+comp.lang.python@pearwood.info> wrote: > Note that it is important for my purposes that MockChainMap does not > inherit from dict. Care to elaborate? > Now I try to create a function that uses a MockChainMap instead of a dict > for its globals: > > function = type(lambda: None) > f = lambda x: (a+b+x) > g = function(f.__code__, MockChainMap(), 'g') > > And that's where I get into trouble: > > Traceback (most recent call last): > File "<stdin>", line 1, in <module> > TypeError: function() argument 2 must be dict, not MockChainMap > > > How do I build a function with globals set to a non-dict mapping? > > If this can't be done, any suggestions for how I might proceed? This looks like one of those cases where there is strict type checking (of a Python object) at the C level. You may consider bringing this up in a tracker ticket. Unless there are performance implications, it's likely a case of no one having bothered to change this spot to be more duck-type friendly. There are quite a few of those in CPython and I've seen at least a couple updated when someone brought it up. Regardless, you could also implement __call__() on a function look-alike class to get what you're after. It may not be as performant though. -eric
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Using non-dict namespaces in functions Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-03-17 11:18 +0000
Re: Using non-dict namespaces in functions Eric Snow <ericsnowcurrently@gmail.com> - 2012-03-17 11:42 -0700
Re: Using non-dict namespaces in functions Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-03-18 01:52 +0000
Re: Using non-dict namespaces in functions Peter Otten <__peter__@web.de> - 2012-03-18 08:50 +0100
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