Merge pull request #22931 from larsoner/ls

timhoffm · web-flow · commit e73ce5a6e17d · 2022-04-28T21:15:13.000+02:00
BUG: Fix regression with ls=(0, ())
diff --git a/lib/matplotlib/backend_bases.py b/lib/matplotlib/backend_bases.py
@@ -924,7 +924,7 @@ def set_dashes(self, dash_offset, dash_list):
             if np.any(dl < 0.0):
                 raise ValueError(
                     "All values in the dash list must be non-negative")
-            if not np.any(dl > 0.0):
+            if dl.size and not np.any(dl > 0.0):
                 raise ValueError(
                     'At least one value in the dash list must be positive')
         self._dashes = dash_offset, dash_list
diff --git a/lib/matplotlib/tests/test_lines.py b/lib/matplotlib/tests/test_lines.py
@@ -108,7 +108,9 @@ def test_valid_colors():
 def test_linestyle_variants():
     fig, ax = plt.subplots()
     for ls in ["-", "solid", "--", "dashed",
-               "-.", "dashdot", ":", "dotted"]:
+               "-.", "dashdot", ":", "dotted",
+               (0, None), (0, ()), (0, []),  # gh-22930
+               ]:
         ax.plot(range(10), linestyle=ls)
     fig.canvas.draw()
 
