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  • Zeus Intuivo thinks this is interesting:

plpython3u;

From

Cover of PostgreSQL Developer's Guide

Note

<div><p>Here plpython2u; worked for me<br>I did a </p>
<p> ls /Applications/Postgres.app/Contents/Versions/9.5/share/postgresql/extension/</p>
<p>and only got a list of things that could be languages, that’S how I figured out</p>
</div>