import numpy as np
import holoviews as hv
from holoviews import opts

hv.extension('matplotlib')

hv.BoxWhisker(np.random.randn(1000), vdims='Value')

groups = [chr(65+g) for g in np.random.randint(0, 3, 200)]
box = hv.BoxWhisker((groups, np.random.randint(0, 5, 200), np.random.randn(200)),
                    ['Group', 'Category'], 'Value').sort()

box.opts(opts.BoxWhisker(aspect=2, fig_size=200, whiskerprops={'color': 'gray'}))