Funnel plot in Pandas
Better late than never.With plotly you can perform funnels. Here is a simple example https://plot.ly/python/funnel-charts/
The best solution I found so far is to use matplotlib library along with pandas to create segmented horizontal bar chart. You will need to add one dummy category in order to shift categories to centre. Detailed explanation can be found here.
There's another solution if you want to use the non-segmented bar chart you can create the function, more details can be found here.