Take 2: PEP draft for expression embedding

[Fredrik Lundh]

Oren Tirosh wrote:
> This new draft should address all the technical issues people here have
> raised in reponses to my previous draft.

it still doesn't explain why messing up the language with ugly and
unreadable syntax is a good idea, when you can get *exactly* the
same advantages in a way that works with *all* existing python
versions and *all* existing syntax-aware tools.

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