⬆️ Bump anaconda from 2026.06 to 2026.07

[mmcky]

Rolling monthly bump of the conda env pin anaconda=2026.06 → 2026.07.

Why this is hand-authored rather than a Dependabot PR

Dependabot assigns each repo a fixed weekly slot, and this repo's slot had not yet fired for the 2026.07 release. The rest of the Python lecture family has already been bumped, validated and merged, so this opens the PR by hand to finish the sweep rather than waiting several more days.

If Dependabot later opens its own PR for the same bump it will not recognise this one, so that duplicate should be closed (as happened with lecture-python-advanced.myst#349 during the 2026.06 round).

Validation

The pull_request CI check is not a meaningful test of an env-only bump — it downloads the main build-cache artifact and reuses the cached notebook outputs, so it skips re-executing the notebooks under the new env entirely. A green check there proves nothing about the upgrade.

The canonical signal is a cache.yml dispatch on this branch, which does a full fresh jb build lectures -W --keep-going (warnings→errors) executing every notebook under 2026.07. I have dispatched that run and will report the result here.

Known 2026.07 breakage — pre-checked

The one regression found so far in this sweep is that anaconda 2026.07's matplotlib removes the long-deprecated matplotlib.cm.get_cmap, which raises ImportError at import time and kills the whole notebook (hit lecture-python-intro laffer_adaptive.md, fixed in QuantEcon/lecture-python-intro#798). I grepped this repo's lectures/ for that pattern before opening — no hits.

Cross-repo status for this sweep is tracked in QuantEcon/workspace-lectures#21.

[Copilot]

Pull request overview

Updates the repository’s Conda environment definition to the next monthly Anaconda metapackage release, keeping the lecture build/runtime environment aligned with the rest of the Python lecture family’s 2026.07 sweep.

Changes:

• Bump anaconda metapackage pin from 2026.06 to 2026.07 in environment.yml.

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[mmcky]

✅ Validated — safe to merge.

Validated by dispatching cache.yml on this branch, which does a full fresh jb build lectures -W --keep-going (warnings→errors), executing every notebook under anaconda 2026.07 rather than reusing the main build cache.

Result: run 29708296238 completed success, with the build job running 38m55s — a full execution pass, not a cache reuse.

I also grepped lectures/ beforehand for the one regression this sweep has turned up — anaconda 2026.07's matplotlib removes the long-deprecated matplotlib.cm.get_cmap, which raises ImportError at import time (it broke lecture-python-intro laffer_adaptive.md, fixed in QuantEcon/lecture-python-intro#798). No hits in this repo.

Note: the pull_request CI check isn't a meaningful test of an env-only bump — it downloads the main build-cache artifact and skips re-executing unchanged notebooks. The cache-workflow run above is the canonical signal.

Cross-repo status for this sweep is tracked in QuantEcon/workspace-lectures#21.