Axespad Windrose meaning

I am new to Python and am trying to create a wind rose using the code windrose.py

found on this site: http://sourceforge.net/projects/windrose/

Below is the code I am running and I found sample code on the following website: http://youarealegend.blogspot.com/search/label/windrose

import numpy

from windrose import WindroseAxes
from matplotlib import pyplot as plt
import matplotlib.cm as cm
from numpy.random import random
from numpy import arange 
import windrose as wr


import matplotlib.pyplot as mp
import windrose

#Create wind speed and direction variables
ws = random(500)*6
wd = random(500)*360


#A quick way to create new windrose axes...
def new_axes():
  fig = plt.figure(figsize=(8, 8), dpi=80, facecolor='w', edgecolor='w')
  rect = [0.1, 0.1, 0.8, 0.8]
  ax = WindroseAxes(fig, rect, axisbg='w')
  fig.add_axes(ax)
return ax

#...and adjust the legend box
def set_legend(ax):
  l = ax.legend(axespad=-0.10)
  plt.setp(l.get_texts(), fontsize=8)

wr.wrcontourf(wd, ws)

      

        
        
        
      

    

When I run this code, I get the following error:

RuntimeWarning: invalid value encountered in rint
  return round(decimals, out)

TypeError: __init__() got an unexpected keyword argument 'axespad'

      

        
        
        
      

    

Although I've tried a few things, I can't figure out what the axespad variable does in this code. Any advice would help!