title: What does the .N mean in this block of Python code?
body: <p>I am working through Learn Python the Hard Way and am browsing through some code on Git Hub before moving on. I am just curious what the .N does on the line with "tm.N = 1000" and how it relates to the end of the code.</p>
  
  <pre><code>import matplotlib.pyplot as plt
  
  import random
  import pandas.util.testing as tm
  tm.N = 1000
  df = tm.makeTimeDataFrame()
  import string
  foo = list(string.letters[:5]) * 200
  df['indic'] = list(string.letters[:5]) * 200
  random.shuffle(foo)
  df['indic2'] = foo
  df.boxplot(by=['indic', 'indic2'], fontsize=8, rot=90)
  
  plt.show()
  </code></pre>