title: How to add a variable to Python plt.title?
body: <p>I am trying to plot lots of diagrams, and for each diagram, I want to use a variable to label them. How can I add a variable to <code>plt.title?</code> For example:</p>
  
  <pre><code>import numpy as np
  import matplotlib.pyplot as plt
  
  plt.figure(1)
  plt.ylabel('y')
  plt.xlabel('x')
  
  for t in xrange(50, 61):
      plt.title('f model: T=t')
  
      for i in xrange(4, 10):
          plt.plot(1.0 / i, i ** 2, 'ro')
  
      plt.legend
      plt.show()
  </code></pre>
  
  <p>In the argument of <code>plt.title()</code>, I want <code>t</code> to be variable changing with the loop.</p>