title: python scatter plot legend border color refuses to change
body: <p>This code might be useful to others struggling w/ scatter plots in matplotlib for python.  It works except for this one problem.  I have poured over many help topics on this site and elsewhere.  As per comments in my code, there are different ways to set the <code>edgecolor</code> on the border of the legend and yet none of them are working for me.  Python always throws an error indicating I am trying to set something that does not exist.</p>
  
  <p>Can anyone see what the fix is here?</p>
  
  <pre><code>%matplotlib inline
  import matplotlib.pyplot as plt
  
  stLen = iris[Species=='setosa']['Petal.Length']
  stWid = iris[Species=='setosa']['Petal.Width']
  
  vsLen = iris[Species=='versicolor']['Petal.Length']
  vsWid = iris[Species=='versicolor']['Petal.Width']
  
  viLen = iris[Species=='virginica']['Petal.Length']
  viWid = iris[Species=='virginica']['Petal.Width']
  
  plt.rcParams['figure.figsize'] = 8, 6
  plt.rc('axes',edgecolor='black')
  
  fntsz = 12  # global font size adjustment
  
  sctplt1 = plt.scatter(stLen, stWid, c='blue',   alpha=0.8) 
  sctplt2 = plt.scatter(vsLen, vsWid, c='red',    alpha=0.8)  
  sctplt3 = plt.scatter(viLen, viWid, c='purple', alpha=0.8)
  
  plt.legend((sctplt1, sctplt2, sctplt3),
             ('setosa', 'versicolor', 'virginica'),
             scatterpoints=3,
             loc='upper left',
             ncol=1,
             fontsize=10, frameon=True).get_frame().set_edgecolor('black')
                          # help claimed edgecolor should be legend() argument but errors say otherwise
                          # .getframe().set_edgecolor() was supposed to do it but its not working
  
  plt.title('Iris', fontsize = fntsz)     # defaults to center ... to change this:  plt.title('title', loc='right' | 'left')
  plt.xlabel('Petal Length', fontsize = fntsz)
  plt.ylabel('Petal Width', fontsize = fntsz)
  
  # turn off grid lines:
  plt.grid(b=False)
  
  # to save to a file
  # fig.savefig('test.jpg')
  
  plt.show
  </code></pre>