散景+绘制多级柱线图

Question

I have a dataframe with columns as below after a pivot operation;
And now I would like to plot line charts for each of these 8 columns using bokeh.

df.columns       
MultiIndex(levels=[['A', 'B', 'C'], ['EXT', 'IC', 'INT']],   
labels=[[0, 0, 1, 1, 1, 2, 2, 2], [0, 1, 0, 1, 2, 0, 1, 2]],  
names=['SCHED', 'DInd'])

I was thinking of utilizing a for loop for this:

from bokeh.charts import Line, output_file, show       
from bokeh.plotting import figure, show, output_file 
p1 = figure(x_axis_type="datetime", title="All Schedules")    
for col in df:        
        p1.line(df.index, df[col], legend=col)       
output_file("line.html", title="example")       
show(p1) 

However I cannot seem to call or select the multi level columns properly.
Can you please assist

Answer 1

In your case, you should've seen an error like

ValueError: expected an element of either String, Dict(Enum('expr', 'field', 'value', 'transform'), Either(String, Instance(Transform), Instance(Expression), List(String))) or List(String), got ('A', 'EXT')

which clearly shows that somewhere you pass an incorrect type. In this case, it's legend argument of the line glyph function. You can fix the error by eg writing legend=str(col) .