PYTHON

plotly line plot

import plotly.express as px

df = px.data.gapminder().query("continent=='Oceania'")
fig = px.line(df, x="year", y="lifeExp", color='country')
fig.show()

add line plotly

fig.add_hline(y=0.9) #line
fig.add_vrect(x0=0.9, x1=2) #rectangle