[Python-Dev] PEP 565: Show DeprecationWarning in __main__

[Victor Stinner]

2017-12-05 19:24 GMT+01:00 Guido van Rossum <guido at python.org>:
>> I disagree that *users* of an application is supposed to "handle"
>> deprecation warnings: report them to the developer, or even try to fix
>> them. IHMO these warnings (hidden by default) were introduced for
>> developers of the application.
>
> But the whole point of the PEP is that it only warns about deprecations in
> code over which the user has control -- likely __main__ is their own code,
> and they *can* handle it.

IMHO the core of the PEP 565 is to propose a compromise to separate
"own code" and "external code" (cannot be modified).

I'm unhappy with this suboptimal compromise: "only __main__ is my own
code". Maybe we need something to declare the code that we own, to
enable warnings on them. Just a simple helper on top of
warnings.filterwarnings()? Or maybe I'm already in the "the better is
the enemy of the good" greay area :-)

Victor