'NumberInput' has no attribute 'param'

[sdc50]

Starting with panel version 0.10.0a28, when trying to substitute the default widget for a param.Integer with another widget (e.g. pn.widgets.Spinner or pn.widgets.NumberInput) I get the following error:

AttributeError: type object 'NumberInput' has no attribute 'param'

bokeh=2.2.3
param=1.10.0

The following code works with panel=0.10.0a27, but produces an error in all releases starting with panel=0.10.0a28 (including 0.10.0).

class Test(param.Parameterized):
    a = param.Integer(default=1, bounds=(1,10))

    def panel(self):
        return pn.panel(
            self,
            widgets={'a': pn.widgets.Spinner},
        )
t = Test()
t.panel()

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-6-b87b7a79b9d9> in <module>
      8         )
      9 t = Test()
---> 10 t.panel()

<ipython-input-6-b87b7a79b9d9> in panel(self)
      3 
      4     def panel(self):
----> 5         return pn.panel(
      6             self,
      7             widgets={'a': pn.widgets.NumberInput},

~/miniconda/envs/uit/lib/python3.9/site-packages/panel/pane/base.py in panel(obj, **kwargs)
     49     if kwargs.get('name', False) is None:
     50         kwargs.pop('name')
---> 51     pane = PaneBase.get_pane_type(obj, **kwargs)(obj, **kwargs)
     52     if len(pane.layout) == 1 and pane._unpack:
     53         return pane.layout[0]

~/miniconda/envs/uit/lib/python3.9/site-packages/panel/param.py in __init__(self, object, **params)
    189             'object', 'parameters', 'name', 'display_threshold', 'expand_button',
    190             'expand', 'expand_layout', 'widgets', 'show_labels', 'show_name'])
--> 191         self._update_widgets()
    192 
    193     def __repr__(self, depth=0):

~/miniconda/envs/uit/lib/python3.9/site-packages/panel/param.py in _update_widgets(self, *events)
    258             self._widgets = {}
    259         else:
--> 260             self._widgets = self._get_widgets()
    261 
    262         alias = {'_title': 'name'}

~/miniconda/envs/uit/lib/python3.9/site-packages/panel/param.py in _get_widgets(self)
    528         else:
    529             widgets = []
--> 530         widgets += [(pname, self.widget(pname)) for pname in self._ordered_params]
    531         return OrderedDict(widgets)
    532 

~/miniconda/envs/uit/lib/python3.9/site-packages/panel/param.py in <listcomp>(.0)
    528         else:
    529             widgets = []
--> 530         widgets += [(pname, self.widget(pname)) for pname in self._ordered_params]
    531         return OrderedDict(widgets)
    532 

~/miniconda/envs/uit/lib/python3.9/site-packages/panel/param.py in widget(self, p_name)
    390                 kw['step'] = p_obj.step
    391 
--> 392         kwargs = {k: v for k, v in kw.items() if k in widget_class.param}
    393 
    394         if isinstance(widget_class, Widget):

~/miniconda/envs/uit/lib/python3.9/site-packages/panel/param.py in <dictcomp>(.0)
    390                 kw['step'] = p_obj.step
    391 
--> 392         kwargs = {k: v for k, v in kw.items() if k in widget_class.param}
    393 
    394         if isinstance(widget_class, Widget):

AttributeError: type object 'NumberInput' has no attribute 'param'

[philippjfr]

Thanks @sdc50! The problem is that NumberInput basically just defers to IntInput and FloatInput. An easy fix here is to just make it a subclass of _SpinnerBase though.