Re: PL/Python - lifetime of variables?

On Wed, 19 Feb 2020 at 09:12, Kohei KaiGai <kaigai(at)heterodb(dot)com> wrote:

> I noticed that variables in PL/Python are not released at the end of procedure.
> Does it expected behavior?

PL/Python vars are freed when the interpreter instance is freed and
their refcounts reach zero.

I believe we use one subinterpreter for the lifetime of the backend
session. It might be worth checking whether we do an eager refcount
check and sweep when a procedure finishes.

But in general, I suggest that relying on object
finalizers/destructors to accomplish side effects visible outside the
procedure is bad development practice. Instead, use a "with" block, or
a try/finally block, and do explicit cleanup for external resources.

--
Craig Ringer http://www.2ndQuadrant.com/
2ndQuadrant - PostgreSQL Solutions for the Enterprise