[issue10220] Make generator state easier to introspect

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

Looks good, modulo two nitpicks:

1) Using literals for constants would avoid a lookup and call of range.

2) Please remove four leading spaces in your docstring.

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nosy: +eric.araujo

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