code: def pie_plot(chart_pie):
      return chart_pie.plot
  
imports: import itertools
  import platform
  import weakref
  import numpy
  import pytest
  from vtkmodules.vtkRenderingContext2D import vtkPen
  import pyvista
  from pyvista import examples
  from pyvista.plotting import charts
  from pyvista.plotting.colors import COLOR_SCHEMES
label_desc: Use image node_id 15 for calling a global function with example usage: pie_plot(chart_pie) and returns: chart_pie