Fix zip argument to include all levels in reshape

AnonToky · web-flow · commit 71d2c9707afe · 2025-11-25T18:45:05.000+08:00
diff --git a/pandas/core/reshape/reshape.py b/pandas/core/reshape/reshape.py
@@ -792,7 +792,7 @@ def _stack_multi_column_index(columns: MultiIndex) -> MultiIndex | Index:
         [
             # Not all indices can accept None values.
             Index(new_lev, dtype=lev.dtype) if None not in new_lev else new_lev
-            for new_lev, lev in zip(new_levs, columns.levels[:-1], strict=True)
+            for new_lev, lev in zip(new_levs, columns.levels)
         ],
         names=columns.names[:-1],
     )

Original file line number	Diff line number	Diff line change
`@@ -792,7 +792,7 @@ def _stack_multi_column_index(columns: MultiIndex) -> MultiIndex \| Index:`
`792`	`792`	`[`
`793`	`793`	`# Not all indices can accept None values.`
`794`	`794`	`Index(new_lev, dtype=lev.dtype) if None not in new_lev else new_lev`
`795`		`- for new_lev, lev in zip(new_levs, columns.levels[:-1], strict=True)`
	`795`	`+ for new_lev, lev in zip(new_levs, columns.levels)`
`796`	`796`	`],`
`797`	`797`	`names=columns.names[:-1],`
`798`	`798`	`)`