[docs] [issue35109] Doctest in CI uses python binary built from master causing DeprecationWarnings

[Karthikeyan Singaravelan]

Karthikeyan Singaravelan <tir.karthi at gmail.com> added the comment:

> If we do so, we won't be able to write doctest about new features (existing in 3.8, not existing in 3.7), which is worse than having warnings.

I agree with the same. Maybe I am running doctest wrong locally? I use make venv and make doctest. Sorry for the confusion on this.

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<https://bugs.python.org/issue35109>
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