/usr/share/postgresql/9.4/extension/plpython3u--unpackaged--1.0.sql is in postgresql-plpython3-9.4 9.4.18-0+deb8u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | /* src/pl/plpython/plpython3u--unpackaged--1.0.sql */
ALTER EXTENSION plpython3u ADD PROCEDURAL LANGUAGE plpython3u;
-- ALTER ADD LANGUAGE doesn't pick up the support functions, so we have to.
ALTER EXTENSION plpython3u ADD FUNCTION plpython3_call_handler();
ALTER EXTENSION plpython3u ADD FUNCTION plpython3_inline_handler(internal);
ALTER EXTENSION plpython3u ADD FUNCTION plpython3_validator(oid);
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