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REF: Avoid/defer dtype=object containers in plotting #62042

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Merged
merged 3 commits into from
Aug 5, 2025
Merged

REF: Avoid/defer dtype=object containers in plotting #62042

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f624b64
Avoid dtype=object in group plotting
mroeschke Aug 4, 2025
62645c0
Conver to Series at the end
mroeschke Aug 4, 2025
fbbca5c
Rename variable for typing
mroeschke Aug 4, 2025
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9 changes: 6 additions & 3 deletions pandas/plotting/_matplotlib/boxplot.py
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Original file line number Diff line number Diff line change
Expand Up @@ -190,7 +190,8 @@ def maybe_color_bp(self, bp) -> None:

def _make_plot(self, fig: Figure) -> None:
if self.subplots:
self._return_obj = pd.Series(dtype=object)
obj_axes = []
obj_labels = []

# Re-create iterated data if `by` is assigned by users
data = (
Expand Down Expand Up @@ -221,10 +222,12 @@ def _make_plot(self, fig: Figure) -> None:
ax, y, column_num=i, return_type=self.return_type, **kwds
)
self.maybe_color_bp(bp)
self._return_obj[label] = ret
obj_axes.append(ret)
obj_labels.append(label)
_set_ticklabels(
ax=ax, labels=ticklabels, is_vertical=self.orientation == "vertical"
)
self._return_obj = pd.Series(obj_axes, index=obj_labels, dtype=object)
else:
y = self.data.values.T
ax = self._get_ax(0)
Expand Down Expand Up @@ -400,7 +403,7 @@ def plot_group(keys, values, ax: Axes, **kwds):
ax.set_ylabel(pprint_thing(ylabel))

keys = [pprint_thing(x) for x in keys]
values = [np.asarray(remove_na_arraylike(v), dtype=object) for v in values]
values = [remove_na_arraylike(v) for v in values]
bp = ax.boxplot(values, **kwds)
if fontsize is not None:
ax.tick_params(axis="both", labelsize=fontsize)
Expand Down
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