Nota: A Document Language for the Browser(nota-lang.org)

    %(export let metadata = {
      title: "matplotlib demo",
      format: {html: {codeFold: true}},
      jupyter: "python3"
    })

    For a demonstration of a line plot on a polar axis, see @Ref{fig-polar}.

    @Code[language=Python][label="fig-polar"][figCap="A line plot on a polar axis"]{
      import numpy as np
      import matplotlib.pyplot as plt

      r = np.arange(0, 2, 0.01)
      theta = 2 * np.pi * r
      fig, ax = plt.subplots(
        subplot_kw = {'projection': 'polar'} 
      )
      ax.plot(theta, r)
      ax.set_rticks([0.5, 1, 1.5, 2])
      ax.grid(True)
      plt.show()
    }

    @Code[figCap=@{A @strong{line plot} on a @em{polar axis}}]{
      ...
    }