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[house_auction] upgrade prettytable + wcwidth to fix wcwidth.width error (#937)

prettytable 3.18.0 (2026-06-22) calls wcwidth.width() and requires wcwidth>=0.3.5, but the anaconda base ships wcwidth 0.2.13 (no .width), and `!pip install prettytable` does not upgrade it, so the lecture fails with `AttributeError: module 'wcwidth' has no attribute 'width'` on a full build. Install with `-U prettytable wcwidth` so pip pulls a wcwidth (0.8.1) that exposes .width. Part of #935 (house_auction item; arviz items remain). Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

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Original file line number	Diff line number	Diff line change
`@@ -17,7 +17,7 @@ kernelspec:`
`17`	`17`	`---`
`18`	`18`	`tags: [hide-output]`
`19`	`19`	`---`
`20`		`-!pip install prettytable`
	`20`	`+!pip install -U prettytable wcwidth`
`21`	`21`	```
`22`	`22`
`23`	`23`	`## Overview`