holoviews: AttributeError: module '_sitebuiltins' has no attribute 'id'

Hi everyone!

I am working with holoviews (on jupyterlab and using python3.6 inside a conda environment)

import holoviews as hv
hv.extension('bokeh')

data = [('one',8),('two', 10), ('three', 16), ('four', 8), ('five', 4), ('six', 1)]
bars = hv.Bars(data, hv.Dimension('Car occupants'), 'Count')
bars

and now it is raising the follow error:

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-28-a479292d5c93> in <module>()
      1 data = [('one',8),('two', 10), ('three', 16), ('four', 8), ('five', 4), ('six', 1)]
----> 2 bars = hv.Bars(data, hv.Dimension('Car occupants'), 'Count')
      3 bars

/mnt/sda1/storage/miniconda/envs/xnd-notebooks/lib/python3.6/site-packages/holoviews/core/data/__init__.py in __init__(self, data, kdims, vdims, **kwargs)
    231                                            datatype=kwargs.get('datatype'))
    232         (data, self.interface, dims, extra_kws) = initialized
--> 233         super(Dataset, self).__init__(data, **dict(kwargs, **dict(dims, **extra_kws)))
    234         self.interface.validate(self, validate_vdims)
    235 

/mnt/sda1/storage/miniconda/envs/xnd-notebooks/lib/python3.6/site-packages/holoviews/core/dimension.py in __init__(self, data, kdims, vdims, **params)
    872             params['cdims'] = {d if isinstance(d, Dimension) else Dimension(d): val
    873                                for d, val in params['cdims'].items()}
--> 874         super(Dimensioned, self).__init__(data, **params)
    875         self.ndims = len(self.kdims)
    876         cdims = [(d.name, val) for d, val in self.cdims.items()]

/mnt/sda1/storage/miniconda/envs/xnd-notebooks/lib/python3.6/site-packages/holoviews/core/dimension.py in __init__(self, data, id, plot_id, **params)
    582         self.data = data
    583         self.id = id
--> 584         self._plot_id = plot_id or builtins.id(self)
    585         if isinstance(params.get('label',None), tuple):
    586             (alias, long_name) = params['label']

AttributeError: module '_sitebuiltins' has no attribute 'id'

it was working before I’ve updated my environment.

any idea what could be the problem? thanks!