Commit 1ed02f0

and

authored

[inequality] Take writeable copy before rd.shuffle (pandas 3.0) (#776)

pandas 3.0 returns a read-only array from np.asarray() of a Series (Copy-on-Write), so rd.shuffle(y) raised "ValueError: assignment destination is read-only" during the anaconda=2026.06 build. Take a writeable .copy() before the in-place shuffle. See #775. Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

1 file changed

Lines changed: 2 additions & 1 deletion

File tree

lectures

Lines changed: 2 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -284,7 +284,8 @@ for var in varlist:`
`284`	`284`	`# Repeat the observations according to their weights`
`285`	`285`	`counts = list(round(df[df['year'] == year]['weights'] ))`
`286`	`286`	`y = df[df['year'] == year][var].repeat(counts)`
`287`		`- y = np.asarray(y)`
	`287`	+ # `.copy()` gives a writeable array (pandas 3.0 returns a read-only one)
	`288`	`+ y = np.asarray(y).copy()`
`288`	`289`
`289`	`290`	`# Shuffle the sequence to improve the plot`
`290`	`291`	`rd.shuffle(y)`