Gridded dataset notebook raise ValueError

[hoxbro]

Running the examples/user_guide/Gridded_Datasets_I.ipynb and examples/user_guide/Gridded_Datasets_II.ipynb with the latest param and Holoviews, we get the following error: ValueError: kdims: list length must be between 2 and 2 (inclusive).

Related PRs: holoviz/holoviews#5667 and holoviz/param#605

---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
Cell In[4], line 4
      1 kdims = ['time', 'longitude', 'latitude']
      2 vdims = ['surface_temperature']
----> 4 xr_dataset = gv.Dataset(xr_ensemble, kdims=kdims, vdims=vdims)
      5 iris_dataset = gv.Dataset(iris_ensemble, kdims=kdims, vdims=vdims)

File ~/Repos/holoviz/geoviews/geoviews/element/geo.py:110, in _Element.__init__(self, data, kdims, vdims, **kwargs)
    108 elif isinstance(data, _Element):
    109     kwargs['crs'] = data.crs
--> 110 super(_Element, self).__init__(data, kdims=kdims, vdims=vdims, **kwargs)

File ~/Repos/holoviz/holoviews/holoviews/core/data/__init__.py:334, in Dataset.__init__(self, data, kdims, vdims, **kwargs)
    331 initialized = Interface.initialize(type(self), data, kdims, vdims,
    332                                    datatype=kwargs.get('datatype'))
    333 (data, self.interface, dims, extra_kws) = initialized
--> 334 super().__init__(data, **dict(kwargs, **dict(dims, **extra_kws)))
    335 self.interface.validate(self, validate_vdims)
    337 # Handle _pipeline property

File ~/Repos/holoviz/holoviews/holoviews/core/dimension.py:844, in Dimensioned.__init__(self, data, kdims, vdims, **params)
    841 if 'cdims' in params:
    842     params['cdims'] = {d if isinstance(d, Dimension) else Dimension(d): val
    843                        for d, val in params['cdims'].items()}
--> 844 super().__init__(data, **params)
    845 self.ndims = len(self.kdims)
    846 cdims = [(d.name, val) for d, val in self.cdims.items()]

File ~/Repos/holoviz/holoviews/holoviews/core/dimension.py:503, in LabelledData.__init__(self, data, id, plot_id, **params)
    500     util.group_sanitizer.add_aliases(**{alias:long_name})
    501     params['group'] = long_name
--> 503 super().__init__(**params)
    504 if not util.group_sanitizer.allowable(self.group):
    505     raise ValueError("Supplied group %r contains invalid characters." %
    506                      self.group)

File ~/Repos/holoviz/param/param/parameterized.py:3231, in Parameterized.__init__(self, **params)
   3228 self._dynamic_watchers = defaultdict(list)
   3230 self.param._generate_name()
-> 3231 self.param._setup_params(**params)
   3232 object_count += 1
   3234 self.param._update_deps(init=True)

File ~/Repos/holoviz/param/param/parameterized.py:1453, in as_uninitialized.<locals>.override_initialization(self_, *args, **kw)
   1451 original_initialized = parameterized_instance.initialized
   1452 parameterized_instance.initialized = False
-> 1453 fn(parameterized_instance, *args, **kw)
   1454 parameterized_instance.initialized = original_initialized

File ~/Repos/holoviz/param/param/parameterized.py:1704, in Parameters._setup_params(self_, **params)
   1702     self.param.warning("Setting non-parameter attribute %s=%s using a mechanism intended only for parameters", name, val)
   1703 # i.e. if not desc it's setting an attribute in __dict__, not a Parameter
-> 1704 setattr(self, name, val)

File ~/Repos/holoviz/param/param/parameterized.py:382, in instance_descriptor.<locals>._f(self, obj, val)
    380     instance_param.__set__(obj, val)
    381     return
--> 382 return f(self, obj, val)

File ~/Repos/holoviz/param/param/parameterized.py:1266, in Parameter.__set__(self, obj, val)
   1263 if hasattr(self, 'set_hook'):
   1264     val = self.set_hook(obj,val)
-> 1266 self._validate(val)
   1268 _old = NotImplemented
   1269 # obj can be None if __set__ is called for a Parameterized class

File ~/Repos/holoviz/param/param/__init__.py:1671, in List._validate(self, val)
   1666 """
   1667 Checks that the value is numeric and that it is within the hard
   1668 bounds; if not, an exception is raised.
   1669 """
   1670 self._validate_value(val, self.allow_None)
-> 1671 self._validate_bounds(val, self.bounds)
   1672 self._validate_item_type(val, self.item_type)

File ~/Repos/holoviz/param/param/__init__.py:1682, in List._validate_bounds(self, val, bounds)
   1680 if min_length is not None and max_length is not None:
   1681     if not (min_length <= l <= max_length):
-> 1682         raise ValueError("%s: list length must be between %s and %s (inclusive)"%(self.name,min_length,max_length))
   1683 elif min_length is not None:
   1684     if not min_length <= l:

ValueError: kdims: list length must be between 2 and 2 (inclusive)

[maximlt]

You mean with Param and HoloViews from their main branch?

[hoxbro]

Correct, it is not breaking people but needed for the next release.