Inspired by the new collections.ChainMap in Python 3.3 http://docs.python.org/dev/library/collections.html#collections.ChainMap
I would like to experiment with similar non-dictionary namespaces in Python 3.2. My starting point is these two recipes, adapted for Python 3.2: http://code.activestate.com/recipes/305268/ http://code.activestate.com/recipes/577434/ Or for simplicity, here's a mock version: from collections import Mapping class MockChainMap(Mapping): def __getitem__(self, key): if key == 'a': return 1 elif key == 'b': return 2 raise KeyError(key) def __len__(self): return 2 def __iter__(self): yield 'a' yield 'b' Note that it is important for my purposes that MockChainMap does not inherit from dict. 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? -- Steven -- http://mail.python.org/mailman/listinfo/python-list
