我一直在为仪表板进行 COVID19 分析，并且正在使用 JSON 数据源。我已将 json 转换为数据框。我正在绘制“状态”x 轴（分类值）上“死亡天数”的条形图。我正在尝试使用一个函数来更新slider.value。在使用 --log-level=DEBUG 运行散景服务时，我收到以下错误：
有人可以为我提供任何可能导致问题的方向或帮助，因为我是 Python 新手并且感谢任何帮助？或者，如果有任何其他选择。
请在下面找到代码：
cases_summary = requests.get('https://api.rootnet.in/covid19-in/stats/history')
json_data = cases_summary.json()
#Data Cleaning
cases_summary=pd.json_normalize(json_data['data'], record_path='regional', meta='day')
cases_summary['loc']=np.where(cases_summary['loc']=='Nagaland#', 'Nagaland', cases_summary['loc'])
cases_summary['loc']=np.where(cases_summary['loc']=='Madhya Pradesh#', 'Madhya Pradesh', cases_summary['loc'])
cases_summary['loc']=np.where(cases_summary['loc']=='Jharkhand#', 'Jharkhand', cases_summary['loc'])
#Calculate cumulative days since 1st case for each state
cases_summary['day_count']=(cases_summary['day'].groupby(cases_summary['loc']).cumcount())+1
#Initial plot for default slider value=35
days_reach_death_count=cases_summary.loc[(cases_summary['deaths']>=35)].groupby(cases_summary['loc']).head(1).reset_index()
slider = Slider(start=10, end=max(cases_summary['deaths']), value=35, step=10, title="Total Deaths")
source = ColumnDataSource(data=dict(days_reach_death_count[['loc','day_count', 'deaths']]))
q = figure(x_range=days_reach_death_count['loc'], plot_width=1200, plot_height=600, sizing_mode="scale_both")
q.title.align = 'center'
q.title.text_font_size = '17px'
q.xaxis.axis_label = 'State'
q.yaxis.axis_label = 'Days since 1st Case'
q.xaxis.major_label_orientation = math.pi/2
q.vbar('loc', top='day_count', width=0.9, source=source)
deaths = slider.value
q.title.text = 'Days to reach %d Deaths' % deaths
hover = HoverTool(line_policy='next')
hover.tooltips = [('State', '@loc'),
('Days since 1st Case', '@day_count'), # @$name gives the value corresponding to the legend
('Deaths', '@deaths')
]
q.add_tools(hover)
def update(attr, old, new):
days_death_count = cases_summary.loc[(cases_summary['deaths'] >= slider.value)].groupby(cases_summary['loc']).head(1).reindex()
source.data = [ColumnDataSource().from_df(days_death_count)]
slider.on_change('value', update)
layout = row(q, slider)
tab = Panel(child=layout, title="New Confirmed Cases since Day 1")
tabs= Tabs(tabs=[tab])
curdoc().add_root(tabs)