Fix hover tooltips for NetworkX plots (#1439)

hvplot/networkx.py

@@ -6,6 +6,7 @@
 
 from bokeh.models import HoverTool
 from holoviews import Graph, Labels, dim
+from holoviews.core.util import dimension_sanitizer
 from holoviews.core.options import Store
 from holoviews.plotting.bokeh import GraphPlot, LabelsPlot
 from holoviews.plotting.bokeh.styles import markers
@@ -331,7 +332,7 @@ def draw(G, pos=None, **kwargs):
             (d.label, d.name + '_values' if d in g.kdims else d.name) for d in g.kdims + g.vdims
         ]
     tooltips = [
-        (label, '@{{dimension_sanitizer(name)}}')
+        (label, f'@{{{dimension_sanitizer(name)}}}')
         for label, name in tooltip_dims
         if name not in node_styles + edge_styles
     ]

hvplot/tests/testnetworkx.py

@@ -24,3 +24,10 @@ def setUp(self):
     def test_nodes_are_not_sorted(self):
         plot = hvnx.draw(self.g)
         assert all(self.nodes == plot.nodes.dimension_values(2))
+
+    def test_default_hover_tooltip(self):
+        from bokeh.models import HoverTool
+
+        plot = hvnx.draw(self.g)
+        hover = next(t for t in plot.opts['tools'] if isinstance(t, HoverTool))
+        assert [('index', '@{index_hover}')] == hover.tooltips