matplotlib · AtharvaRai07 · May 24, 2025
diff --git a/lib/matplotlib/axes/_axes.py b/lib/matplotlib/axes/_axes.py
@@ -211,7 +211,7 @@ def get_legend_handles_labels(self, legend_handler_map=None):
        return handles, labels

    @_docstring.interpd
-    def legend(self, *args, **kwargs):
+    def legend(self, *args, framelinewidth=None, **kwargs):
        """
        Place a legend on the Axes.

@@ -330,6 +330,10 @@ def legend(self, *args, **kwargs):
        """
        handles, labels, kwargs = mlegend._parse_legend_args([self], *args, **kwargs)
        self.legend_ = mlegend.Legend(self, handles, labels, **kwargs)
+
+        if framelinewidth is not None:
+            self.legend_.get_frame().set_linewidth(framelinewidth)
+
        self.legend_._remove_method = self._remove_legend
        return self.legend_


diff --git a/lib/matplotlib/tests/test_legend.py b/lib/matplotlib/tests/test_legend.py
@@ -107,6 +107,12 @@
    assert_allclose(leg_bboxes[1].bounds, leg_bboxes[0].bounds)
    assert_allclose(leg_bboxes[2].bounds, leg_bboxes[0].bounds)

+def test_legend_framelinewidth():
+    fig, ax = plt.subplots()
+    ax.plot([0, 1], [0, 1], label="test")
+    leg = ax.legend(frameon=True, framelinewidth=5.0)
+    assert leg.get_frame().get_linewidth() == 5.0
+

 def test_legend_auto5():
    """
-Original file line number
+Diff line change
@@ -107,6 +107,12 @@
         assert_allclose(leg_bboxes[1].bounds, leg_bboxes[0].bounds)
         assert_allclose(leg_bboxes[2].bounds, leg_bboxes[0].bounds)
+    def test_legend_framelinewidth():
     Check failure
        on line 110
        in lib/matplotlib/tests/test_legend.py
  



  
      
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    [rdjson] reported by reviewdog 🐶
Expected 2 blank lines, found 1

Raw Output:
message:"Expected 2 blank lines, found 1" location:{path:"/home/runner/work/matplotlib/matplotlib/lib/matplotlib/tests/test_legend.py" range:{start:{line:110 column:1} end:{line:110 column:4}}} source:{name:"ruff" url:"https://docs.astral.sh/ruff"} code:{value:"E302" url:"https://docs.astral.sh/ruff/rules/blank-lines-top-level"} suggestions:{range:{start:{line:109 column:1} end:{line:110 column:1}} text:"\n\n"}
+        fig, ax = plt.subplots()
+        ax.plot([0, 1], [0, 1], label="test")
+        leg = ax.legend(frameon=True, framelinewidth=5.0)
+        assert leg.get_frame().get_linewidth() == 5.0
     def test_legend_auto5():
         """
-          Expand Down