lazy_import: Muffle diagnostic messages for "at_startup"

[mkoeppe]

When loading a modularized part of Sage instead of sage.all, we should suppress the second of these two messages:

        if startup_guard and not self._at_startup:
            print(f"Resolving lazy import {self._name} during startup")
        elif self._at_startup and not startup_guard:
            print(f"Option ``at_startup=True`` for lazy import {self._name} not needed anymore")

Also, instead of print, we should use warnings.warn.

Previous discussion:

• Convert startup methods to context manager #30748

CC: @tscrim @jhpalmieri @nthiery

Component: refactoring

Author: Matthias Koeppe

Branch/Commit: 4a8f409

Reviewer: Travis Scrimshaw

Issue created by migration from https://trac.sagemath.org/ticket/32619

[mkoeppe]

Branch: u/mkoeppe/lazy_import__muffle_diagnostic_messages_for__at_startup_

[mkoeppe]

New commits:

7e7f5fe

sage.doctest.forker: Use sage.misc.lazy_import.ensure_startup_finished

[mkoeppe]

Author: Matthias Koeppe

[mkoeppe]

Commit: 7e7f5fe

[sagetrac-git]

Changed commit from 7e7f5fe to 181e4a0

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

181e4a0

src/sage/misc/lazy_import.pyx: Use warnings.warn instead of print

[tscrim]

comment:5

Green bot => positive review.

[tscrim]

Reviewer: Travis Scrimshaw

[sagetrac-git]

Changed commit from 181e4a0 to bc2b707

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

bc2b707

sage.misc.lazy_import.finish_startup: Fixup

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

9830e4e

src/sage/misc/lazy_import.pyx: Adjust doctest output to use of warnings.warn

[sagetrac-git]

Changed commit from bc2b707 to 9830e4e

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

dadfa07

src/sage/misc/lazy_import.pyx: Fix markup of doctest output

[sagetrac-git]

Changed commit from 9830e4e to dadfa07

[tscrim]

comment:11

There still is one doctest failure in misc/lazy_import.pyx.

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

98d2e9b

src/sage/misc/lazy_import.pyx: In test_fake_startup, also reset finish_startup_called

[sagetrac-git]

Changed commit from dadfa07 to 98d2e9b

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

4a8f409

src/sage/misc/lazy_import.pyx: Warnings suppress duplicates, so use a different import for the repeated test

[sagetrac-git]

Changed commit from 98d2e9b to 4a8f409

[tscrim]

comment:16

LGTM.

[mkoeppe]

comment:17

Thanks!

[vbraun]

Changed branch from u/mkoeppe/lazy_import__muffle_diagnostic_messages_for__at_startup_ to 4a8f409