[house_auction] Pin prettytable<3.18 for base-Anaconda wcwidth compatibility (#939)

prettytable 3.18.0 requires wcwidth>=0.3.5 (it calls wcwidth.width()), but base Anaconda 2026.06 ships wcwidth 0.2.14. The in-lecture '!pip install -U wcwidth' from #937 can't fix this: the kernel imports wcwidth at startup, so the already-cached module isn't reloaded by an in-session pip upgrade. Pin prettytable<3.18 (which works with wcwidth 0.2.14) instead. See #938.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

Author: mmcky

lectures/house_auction.md

@@ -17,7 +17,7 @@ kernelspec:
 ---
 tags: [hide-output]
 ---
-!pip install -U prettytable wcwidth
+!pip install "prettytable<3.18"
 ```
 
 ##  Overview