Fixing layout shape line dash validator #3375

packages/python/plotly/plotly/tests/test_core/test_validators/__init__.py

@@ -0,0 +1,5 @@
+import warnings
+
+
+def setup_package():
+    warnings.filterwarnings("ignore")

packages/python/plotly/plotly/tests/test_core/test_validators/test_validators.py

@@ -0,0 +1,11 @@
+
+from __future__ import absolute_import
+
+from unittest import TestCase
+import plotly.graph_objs as go
+
+
+class TestValidators(TestCase):
+    def test_layout_shape_line_dash_validator(self):
+        # regression from issue #3375
+        go.layout.shape.Line(color='black', width=2, dash='5px,3px,3px,2px')

packages/python/plotly/plotly/validators/layout/shape/line/_dash.py

@@ -1,7 +1,7 @@
 import _plotly_utils.basevalidators
 
 
-class DashValidator(_plotly_utils.basevalidators.StringValidator):
+class DashValidator(_plotly_utils.basevalidators.DashValidator):
     def __init__(self, plotly_name="dash", parent_name="layout.shape.line", **kwargs):
         super(DashValidator, self).__init__(
             plotly_name=plotly_name,