[GitHub] [incubator-heron] Code0x58 edited a comment on issue #3600: no such attribute 'netrc' in 'http_file' rule

[GitBox <gi...@apache.org>]

Code0x58 edited a comment on issue #3600:
URL: https://github.com/apache/incubator-heron/issues/3600#issuecomment-670436973


   _**TL;DR:** your python3 binary is probably called `python` or `python3`, but PEX by default needs `python<major>.<minor>` where the major and minor version are the same as those used to build the PEX_
   
   one thing with PEX is that it tries to be explicit about what version of python it is for by default (you could argue it's good for reproducibility, but a pain for flexibility), so if you run code on a python3.6 interpreter, it will automatically make it so the generated PEX starts with `#!/usr/bin/env python3.6`, rather than more generic shebang lines calling `python3` or `python`.
   
   It seems you don't have a `python3.6` file on your system `$PATH`, which you'll need to stop that _"No such file or directory"_. Centos may have a package or option to install the more explicit `pythonX.Y` link, or you may have to symlink or hardlink it yourself.
   
   p.s. yep, 3.6 is what is tested in CI and the minimum compatible version, but there's a decent chance that later versions also work - I can confirm that the build and tests work with python3.8 as that is what ends up used if you run [`./vagrant/local-ci.sh`](https://github.com/apache/incubator-heron/blob/master/vagrant/local-ci.sh) (which does the same process as Travis CI).


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