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Date: Tue, 12 Feb 2013 00:27:30 +1100
Subject: Re: LangWart: Method congestion from mutate multiplicty
From: Chris Angelico <rosuav@gmail.com>
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Xref: csiph.com comp.lang.python:38679

On Mon, Feb 11, 2013 at 11:53 PM, Rick Johnson
<rantingrickjohnson@gmail.com> wrote:
> Which primitive(s) should NOT have been expanded in your opinion? The "Po=
int" object? I agree, that's why MY implementation would call seq.flatten()=
 on all sub-sequences THEREBY allowing each subtype to define it's own flat=
ten behavior. Of course the default behavior of the SequenceBase#flatten wo=
uld be to flatten everything.
>
> However, ImmutableSequence Types would not flatten. In your example ["spa=
m", "ham"] would not be expanded to ['s', 'p', 'a', 'm', 'h', 'a', 'm']. ps=
st: strings and tuples are immutable!

So...

flatten([None, 23, [1, 2, 3], (2, 3), ["spam", "ham"]])

would return

[None, 23, 1, 2, 3, (2, 3), "spam", "ham"]

? I think that's even more unexpected.

ChrisA