Status of side-effecting functions in python

[Dan Sommers]

On Sat, 25 Oct 2014 23:41:52 +0200, Wolfgang Maier wrote:

> ... It may be rare to use an expression both for its side-effects and
> its return value ...

A lot of concurrency-related operations work that way.  In the old days,
it was CPU-level Test and Set (or Compare and Set) instructions.  These
days, we have Python's threading.Lock.acquire.

Dan