[issue10220] Make generator state easier to introspect

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

I could imagine separating the state into two parts:

- a three-valued enum distinguishing created, active, or exhausted

- a bool (only relevant in the active state) whether it is currently running or suspended

The latter is just g.gi_running so we don't need a new API for this. :-)

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nosy: +gvanrossum

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