import numpy as np
from bokeh.plotting import figure, output_file, show
x = np.arange(16)
y = np.sin(x / 3)
plot = figure(plot_width=300,
plot_height=300)
plot.step(x=x, y=y+2, color ='blue',
legend_label = 'pre')
plot.line(x, y+2,color ='black',
line_alpha = 0.3 ,
line_dash = "dashed")
plot.step(x=x, y=y+1, color ='orange',
legend_label = 'mid')
plot.line(x, y+1, color ='black',
line_alpha = 0.3 ,
line_dash = "dashed")
plot.step(x=x, y=y, color ='green',
legend_label = 'post')
plot.line(x, y, color ='black',
line_alpha = 0.3 ,
line_dash = "dashed")
show(plot)