Support partial bound function (#6009)

holoviews/core/spaces.py

@@ -1,7 +1,7 @@
 import itertools
 import types
 from collections import defaultdict
-from contextlib import contextmanager
+from contextlib import contextmanager, suppress
 from functools import partial
 from itertools import groupby
 from numbers import Number
@@ -547,7 +547,10 @@ def __call__(self, *args, **kwargs):
         kwarg_hash = kwargs.pop('_memoization_hash_', ())
         (self.args, self.kwargs) = (args, kwargs)
         if hasattr(self.callable, 'rx'):
-            return self.callable.rx.value
+            with suppress(TypeError):
+                # If param.bind is used and not all arguments are set
+                # it will raise TypeError
+                return self.callable.rx.value
         if not args and not kwargs and not any(kwarg_hash): return self.callable()
         inputs = [i for i in self.inputs if isinstance(i, DynamicMap)]
         streams = []

holoviews/tests/test_streams.py

@@ -6,8 +6,10 @@
 
 import pandas as pd
 import param
+import pytest
 from panel.widgets import IntSlider
 
+import holoviews as hv
 from holoviews.core.spaces import DynamicMap
 from holoviews.core.util import Version
 from holoviews.element import Curve, Histogram, Points, Polygons, Scatter
@@ -595,6 +597,24 @@ def subscriber_y(**kwargs):
         self.assertEqual(values_y, [{}])
 
 
+@pytest.mark.usefixtures("bokeh_backend")
+def test_dynamicmap_partial_bind_and_streams():
+    # Ref: https://github.com/holoviz/holoviews/issues/6008
+
+    def make_plot(z, x_range, y_range):
+        return Curve([1, 2, 3, 4, z])
+
+    slider = IntSlider(name='Slider', start=0, end=10)
+    range_xy = RangeXY()
+
+    dmap = DynamicMap(param.bind(make_plot, z=slider), streams=[range_xy])
+
+    bk_figure = hv.render(dmap)
+
+    assert bk_figure.renderers[0].data_source.data["y"][-1] == 0
+    assert range_xy.x_range == (0, 4)
+    assert range_xy.y_range == (-0.4, 4.4)
+
 
 class TestSubscribers(ComparisonTestCase):