[issue31568] Configure thinks it finds python3.5 but doesn't

[STINNER Victor]

STINNER Victor added the comment:

The Travis CI error is:
---
python3.5 ./Objects/typeslots.py \

		< ./Include/typeslots.h \

		./Objects/typeslots.inc

pyenv: python3.5: command not found

pyenv: python3.5: command not found

The `python3.5' command exists in these Python versions:

pyenv: python3.5: command not found

  3.5

  3.5.3

make: *** [regen-opcode] Error 127

make: *** Waiting for unfinished jobs....
---

It looks like this Travis CI bug:
https://github.com/travis-ci/travis-ci/issues/8363

I wrote https://github.com/python/cpython/pull/3737 which should works around the Travis CI. Change inspired by:
https://github.com/pre-commit/pre-commit/commit/e3ab8902692e896da9ded42bd4d76ea4e1de359d

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31568>
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