[docs] [issue36597] Travis CI: doctest failure

[Karthikeyan Singaravelan]

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

"Object dead or exiting" is a less frequent random error with doctest. I am not sure from where it occurs but occurs for different tests at different times and is overlooked in Travis since the next runs are fine.

Sample old builds : 

https://travis-ci.org/python/cpython/jobs/517606752
https://travis-ci.org/python/cpython/jobs/510847596

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nosy: +xtreak

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