[issue42574] Travis can't build the 3.8 branch right now

[Brandt Bucher]

Brandt Bucher <brandtbucher at gmail.com> added the comment:

So I suppose we can either:

- set PYTHON_FOR_REGEN to something 3.6+ on these backport branches
- use some other string formatting for that one line

I sort of prefer the second, since I *think* this is the only thing keeping older Pythons from working here.

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