[Python-Dev] PEP 565: Show DeprecationWarning in main (original) (raw)

Guido van Rossum guido at python.org
Sun Nov 12 10:45:52 EST 2017

On Sun, Nov 12, 2017 at 1:24 AM, Nick Coghlan <ncoghlan at gmail.com> wrote:

In Python 2.7 and Python 3.2, the default warning filters were updated to hide DeprecationWarning by default, such that deprecation warnings in development tools that were themselves written in Python (e.g. linters, static analysers, test runners, code generators) wouldn't be visible to their users unless they explicitly opted in to seeing them.

Looking at the official What's New entry for the change ( https://docs.python.org/3/whatsnew/2.7.html#changes-to-the-handling-of-deprecation-warnings) it's not just about development tools. It's about any app (or tool, or utility, or program) written in Python whose users just treat it as "some app", not as something that's necessarily part of their Python environment. While in extreme cases such apps can bundle their own Python interpreter (like Dropbox does), many developers opt to assume or ensure that Python is avaiable, perhaps via the OS package management system. (Because my day job is software development I am having a hard time coming up with concrete examples that aren't development tools, but AFAIK at Dropbox the deployment of e.g. Go binaries is managed through utilities written in Python. The Go developers couldn't care less about that.)

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