code: def format_axes(ax):
      ax.margins(0.2)
      ax.set_axis_off()
      ax.invert_yaxis()
  
file_path: matplotlib/galleries/examples/lines_bars_and_markers/marker_reference.py
imports: import matplotlib.pyplot
  from matplotlib.lines import Line2D
  from matplotlib.markers import MarkerStyle
  from matplotlib.transforms import Affine2D
  import numpy
  import matplotlib.path
  from matplotlib.markers import CapStyle, JoinStyle
label_desc: Use image node_id 1 for calling a global function with example usage: format_axes(ax) without return types