Merge pull request matplotlib#18603 from evanberkowitz/bugfix-for-issue-18600

FIX: Accept MarkerStyle as input to errorbar

closes matplotlib#18600 by using the MarkerStyle copy constructor

Author: tacaswell

lib/matplotlib/lines.py

@@ -1299,8 +1299,7 @@ def update_from(self, other):
         self._solidjoinstyle = other._solidjoinstyle
 
         self._linestyle = other._linestyle
-        self._marker = MarkerStyle(other._marker.get_marker(),
-                                   other._marker.get_fillstyle())
+        self._marker = MarkerStyle(marker=other._marker)
         self._drawstyle = other._drawstyle
 
     def set_dash_joinstyle(self, s):

lib/matplotlib/markers.py

@@ -1,6 +1,7 @@
 r"""
 Functions to handle markers; used by the marker functionality of
-`~matplotlib.axes.Axes.plot` and `~matplotlib.axes.Axes.scatter`.
+`~matplotlib.axes.Axes.plot`, `~matplotlib.axes.Axes.scatter`, and
+`~matplotlib.axes.Axes.errorbar`.
 
 All possible markers are defined here:
 
@@ -216,9 +217,12 @@ def __init__(self, marker=None, fillstyle=None):
         """
         Parameters
         ----------
-        marker : str or array-like or None, default: None
-            *None* means no marker. For other possible marker values see the
-            module docstring `matplotlib.markers`.
+        marker : str, array-like, Path, MarkerStyle, or None, default: None
+            - Another instance of *MarkerStyle* copies the details of that
+              ``marker``.
+            - *None* means no marker.
+            - For other possible marker values see the module docstring
+              `matplotlib.markers`.
 
         fillstyle : str, default: 'full'
             One of 'full', 'left', 'right', 'bottom', 'top', 'none'.
@@ -283,9 +287,12 @@ def set_marker(self, marker):
 
         Parameters
         ----------
-        marker : str or array-like or None, default: None
-            *None* means no marker. For other possible marker values see the
-            module docstring `matplotlib.markers`.
+        marker : str, array-like, Path, MarkerStyle, or None, default: None
+            - Another instance of *MarkerStyle* copies the details of that
+              ``marker``.
+            - *None* means no marker.
+            - For other possible marker values see the module docstring
+              `matplotlib.markers`.
         """
         if (isinstance(marker, np.ndarray) and marker.ndim == 2 and
                 marker.shape[1] == 2):

lib/matplotlib/tests/test_axes.py

@@ -1317,6 +1317,14 @@ def test_arc_ellipse():
     ax.add_patch(e2)
 
 
+def test_marker_as_markerstyle():
+    fix, ax = plt.subplots()
+    m = mmarkers.MarkerStyle('o')
+    ax.plot([1, 2, 3], [3, 2, 1], marker=m)
+    ax.scatter([1, 2, 3], [4, 3, 2], marker=m)
+    ax.errorbar([1, 2, 3], [5, 4, 3], marker=m)
+
+
 @image_comparison(['markevery'], remove_text=True)
 def test_markevery():
     x = np.linspace(0, 10, 100)