[Python-ideas] Allow using ** twice

[Philipp A.]

2013/6/6 MRAB <python at mrabarnett.plus.com>

> With regard to '+=' vs '|=', '+=' on lists adds to what's already
> there, leaving existing items intact, but on dicts it wouldn't, which
> is why I think that '|=' might be clearer (I tend to think of it more
> like set union), but that's just my own view.
>

+= on deques with maxlength < ∞ *does* modify them.
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