On Wed, 10 Jun 2020 at 23:02, Peter Otten <__pete...@web.de> wrote:
> > However later when I actually use it, accessing a key that is not
> > present, should raise KeyError.
> >
> > Is that somehow possible?
>
> It never occured to me to try that, but:
>
> >>> from collections import defaultdict
> >>> d = defaultdict(list)
> >>> d["x"]
> []
> >>> d.default_factory = None
> >>> d["y"]
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> KeyError: 'y'
An alternative approach to this would be to use a regular dict from the start...
d.setdefault("x", []).append("stuff")
--
Matt Wheeler
http://funkyh.at
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