CPSC 375 - Monkey patch Lets-Plot to render graphs correctly as PDF

patch.py

# This goes after the call to LetsPlot.setup_html(),
# but before calling ggplot().

def setup_svg():
  def _repr_svg_(self):
    from io import BytesIO
    from sys import stdout
    file_like = BytesIO()
    self.to_svg(file_like)
    return file_like.getvalue().decode(stdout.encoding)
  import lets_plot
  lets_plot.plot.core.PlotSpec._repr_svg_ = _repr_svg_

setup_svg()