import os
import folium

print(folium.__version__)

m = folium.Map(location=[41, -71], zoom_start=4)

kw = {
    'prefix': 'fa',
    'color': 'green',
    'icon': 'arrow-up'
}

angle = 180
icon = folium.Icon(angle=angle, **kw)
folium.Marker(location=[41, -72], icon=icon, tooltip=str(angle)).add_to(m)

angle = 45
icon = folium.Icon(angle=angle, **kw)
folium.Marker(location=[41, -75], icon=icon, tooltip=str(angle)).add_to(m)

angle = 90
icon = folium.Icon(angle=angle, **kw)
folium.Marker([41, -78], icon=icon, tooltip=str(angle)).add_to(m)

m.save(os.path.join('results', 'Rotate_icon.html'))

m