[issue24450] Add gi_yieldfrom calculated property to generator object

[Yury Selivanov]

Yury Selivanov added the comment:

I think we need some feedback from PyPy & Jython guys on this.  I'm not sure that they can expose 'yieldfrom' slot without some performance penalties.

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nosy: +yselivanov

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24450>
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