import pandas as pd
import holoviews as hv
from holoviews import opts
hv.extension('bokeh')
data = pd.read_csv('book6.csv', delimiter=';')
vdims = ('V132', 'SE132')
heatmaps = []

for etos in [2015, 2016]:
    data1 = data[data['YEAR'] == etos]
    ds = hv.Dataset(data1, ['TF14', 'NOMOS'], vdims)
    heat = hv.HeatMap(ds)
    heat.opts(title_format=str(etos))
    heatmaps.append(heat)

layout = heatmaps[0] + heatmaps[1]
layout.opts(opts.HeatMap(width=500, height=600, tools=['hover'], colorbar=True, toolbar='above', xrotation=45))
hv.save(layout, 'test.html')