title: Having Multiple Lines in a Plot: matplotlib.pyplot
body: <p>I want to have arrays plotted in one plot.</p>
  
  <p>Currently I am doing:</p>
  
  <pre><code>x1=array1
  x2=array2
  
  plt.plot(x1,'b-',label='array1',x2,'g-',label='array2')
  </code></pre>
  
  <p>which gives the error: <code>positional argument follows keyword argument</code>.</p>
  
  <p>However, it works fine when the label is removed.</p>
  
  <p>Does anyone have any suggestions on how to fix this error?</p>