BUG:#22183 : Fixed Groupby Legend Labels for scatter plot

pandas/core/groupby/groupby.py

@@ -169,14 +169,25 @@ def f(self):
             return self.plot(*args, **kwargs)
 
         f.__name__ = "plot"
-        return self._groupby._python_apply_general(f, self._groupby._selected_obj)
+        return self._groupby._python_apply_general(
+            f,
+            self._groupby._selected_obj,
+        )
 
     def __getattr__(self, name: str):
         def attr(*args, **kwargs):
             def f(self):
-                return getattr(self.plot, name)(*args, **kwargs)
+                local_kwargs = kwargs.copy()
+
+                if name == "scatter":
+                    local_kwargs.setdefault("label", self.name)
 
-            return self._groupby._python_apply_general(f, self._groupby._selected_obj)
+                return getattr(self.plot, name)(*args, **local_kwargs)
+
+            return self._groupby._python_apply_general(
+                f,
+                self._groupby._selected_obj,
+            )
 
         return attr
 

pandas/tests/plotting/test_groupby.py

@@ -152,3 +152,21 @@ def test_groupby_hist_series_with_legend_raises(self):
 
         with pytest.raises(ValueError, match="Cannot use both legend and label"):
             g.hist(legend=True, label="d")
+
+    def test_plot_kwargs_scatter_legend_labels(self):
+        df = DataFrame(
+            {
+                "x": [1, 2, 3, 4, 5],
+                "y": [1, 2, 3, 2, 1],
+                "z": list("ababa"),
+            }
+        )
+
+        res = df.groupby("z").plot.scatter(
+            x="x",
+            y="y",
+            legend=True,
+        )
+
+        _check_legend_labels(res["a"], ["a"])
+        _check_legend_labels(res["b"], ["b"])