Currently the default Python 3 interpreter in Nixpkgs is version 3.5.
Version 3.6 was released in December and a first maintenance-release this
March. Unless there are good objections I would like to change the default
Python 3 interpreter to version 3.6.
This will affect a couple of Python applications. I tested several and
haven't run into any issues. Of course, maintainers can always explicitly
choose a different version, like 3.5, if there's a need.
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