include source file from another language into function body?

Hi,

Is there an accepted way to load code in another language into a PostgreSQL
function body?

This would be really nice in several ways, for example: to run a code
checker outside of postgresql, and to make things easier for source code
colorizers.

I have in mind something like

================================================
CREATE OR REPLACE FUNCTION
myfunc( arg1 TEXT, arg2 INTEGER )
RETURNS VOID AS 'Conversion.py' LANGUAGE PLPYTHONU;
================================================

But when I try the above, on running the function I get an error
"could not compile...", which isn't surpising...

For C functions, there is a special form of CREATE FUNCTION ... AS that
causes an object file to be read...

(In the case of Python, one could achieve something like this effect
by using the execfile() function. However as I understand it, this would
happen at run time...)

Thanks!

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