[Python-Dev] Removing PendingDeprecationWarning (original) (raw)

Inada Naoki songofacandy at gmail.com
Mon Mar 25 00:39:11 EDT 2019

On Sun, Mar 24, 2019 at 8:57 PM Nick Coghlan <ncoghlan at gmail.com> wrote:

> > It was added "not be printed by default" version of DeprecationWarning. > But DeprecationWarning is not printed by default now. No, this was covered in PEP 565, and PendingDeprecationWarning was explicitly kept as a way of opting out of the revised semantics of DeprecationWarning.

I know PEP 565. And I don't think difference between PendingDeprecationWarning and DeprecationWarning is still too small to have two categories. For example,

$ cat foo.py import warnings def foo(): warnings.warn("foo", DeprecationWarning)

$ python3 Python 3.7.2 (default, Feb 12 2019, 08:15:36) [Clang 10.0.0 (clang-1000.11.45.5)] on darwin Type "help", "copyright", "credits" or "license" for more information.

import foo foo.foo() (no warning shown)

$ cat >bar.py import foo foo.foo()

$ python3 bar.py (no warning shown)

I can't find I'm using deprecated APIs even when I'm using REPL. When people want to check use of deprecated APIs, they need to use -X dev or -Wd option anyway.

We have many ways to deprecation:

-- Inada Naoki <songofacandy at gmail.com>

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