def generate_worldmap(df_nation_counts):
"""displays a worldmap coded with the pygal-library in HTML format (interactive Chart)
Parameters: Nations Count Dataframe
Returns: HTML worldmap
"""
total_dict = df_nation_counts.set_index('Nation').to_dict('dict').get('Anzahl Gesuche')
dict_1_5000 = dict(filter(lambda elem: elem[1] <= 5000, total_dict.items()))
dict_5000_20000 = dict(filter(lambda elem: (elem[1] > 5000 and elem[1] <= 20000), total_dict.items()))
dict_20000_plus = dict(filter(lambda elem: (elem[1] > 20000), total_dict.items()))
base_html = """
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript" src="https://kozea.github.io/pygal.js/2.0.x/pygal-tooltips.min.js"></script>
<script type="text/javascript" src="http://kozea.github.com/pygal.js/javascripts/pygal-tooltips.js"></script>
</head>
<body>
<figure>
{rendered_chart}
</figure>
</body>
</html>
"""
#styles
custom_style = Style(
colors=('#e4ed80', '#7dccbc', '#63192e'),
tooltip_font_size=8,
legend_font_size=7,
title_font_size=10,
background='#ffffff')
#define chart
worldmap_chart = World(style=custom_style)
worldmap_chart.title = 'Anzahl Asylgesuche nach Nation'
worldmap_chart.add('1-5000 Gesuche', dict_1_5000)
worldmap_chart.add('5000-20000 Gesuche', dict_5000_20000)
worldmap_chart.add('20000+ Gesuche', dict_20000_plus)
#render
rendered_chart = worldmap_chart.render(is_unicode=True)
plot_html = base_html.format(rendered_chart=rendered_chart)
return display(HTML(plot_html))
