如何为带有字体系列的半粗体和半粗体斜体设置和指定字体？

Question

我有一个如下的字体家族

with open('map_NL_provinces.pickle', 'rb') as f:
        provinces = pickle.load(f)

with open('map_NL_cities.pickle', 'rb') as f:
    cities = pickle.load(f)

# renaming key in in dict
provinces['name'] = provinces.pop('names')

provinces = ColumnDataSource(data = provinces)

# from df to CDS
cities = ColumnDataSource(data=cities[['name','x','y']])

# plot map
f.patches('x', 'y', source=provinces,
          fill_color={'field': 'rate', 'transform': color_mapper},
          fill_alpha=1, line_color="black", line_width=1.5)

# plot cities
f.circle(x='x', y='y', source=cities, size=12, color=palette[3])

def callback_cities(attr, old, new):
    # This uses syntax for Bokeh >= 0.12.15
    print("Names of selected circles: {}".format(cities.data['name'][cities.selected.indices]))
    print("Indices of selected circles: ", cities.selected.indices)
    f.title.text=str(cities.data['name'][cities.selected.indices])

def callback_provinces(attr, old, new):
    # This uses syntax for Bokeh >= 0.12.15
    print("Names of selected provinces: {}".format(provinces.data['name'][provinces.selected.indices]))
    print("Indices of selected provinces: ", provinces.selected.indices)
    f.title.text=str(provinces.data['name'][provinces.selected.indices])

cities.on_change('selected', callback_cities)
provinces.on_change('selected', callback_provinces)

我似乎无法在TextViews中访问权重为600的半粗体类型。我该怎么办？

我做了围绕调整TextView的权重和textStyle属性的实验，尚无法解决问题。我浏览了官方文档here，似乎没有指定任何此类内容。

如果有人可以提供任何见解，将会提供巨大的帮助。