! conda list | grep -E 'bokeh|holoviews|geoviews'
bokeh 2.2.3 py38h578d9bd_0 conda-forge geoviews 1.8.2 py_0 conda-forge geoviews-core 1.8.2 py_0 conda-forge holoviews 1.14.1 pyhd3deb0d_0 conda-forge
import holoviews as hv from geoviews.tile_sources import tile_sources hv.extension('bokeh')