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shakna
> Existing applications will not be affected by this change.

I was freaked about breakage for a moment there.

ubernostrum
A better headline would be that the default for newly-created applications will switch.

Existing applications on Heroku will not have their Python version changed.

paulddraper
I assume that's what is meant by "default".
huxley
I wonder if you'll still be able to set the Python version explicitly in the runtime.txt file
nvivo
I find it amazing that Python 3 is almost 10 years old and it's still not been able to replace Python 2 everywhere. I mean, legacy is one thing, but from what I see lots of people still start new projects with python 2.
pvdebbe
Mainly because everyone treats it as a different language from python 2.