On Tue, Jul 5, 2016 at 4:12 PM, Random832 <random...@fastmail.com> wrote:
> So any special logic in your own __setitem__, which may have
> included e.g. copying it to an alternate place, changing the key or
> value, or simply refusing to add the item to the dictionary at all, will
> be ignored, and your object may end up in an inconsistent state.
In this case, here's the value added by STORE_NAME using
PyObject_SetItem, which calls __setitem__:
>>> sorted(m)
['y']
Here are the values added by STORE_GLOBAL using PyDict_SetItem, which
doesn't call __setitem__:
>>> sorted(dict(m))
['__builtins__', 'x']
ChainMap implements the following __setitem__:
def __setitem__(self, key, value):
self.maps[0][key] = value
The item is never actually added to `self` (the dict instance). Then
for __getitem__, we're again only seeing the items from `self.maps`
instead of from `self`:
def __getitem__(self, key):
for mapping in self.maps:
try:
return mapping[key]
except KeyError:
pass
return self.__missing__(key)
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