content: #!/usr/bin/python
  
  print
  print "checking for nltk"
  try:
      import nltk
  except ImportError:
      print "you should install nltk before continuing"
  
  print "checking for numpy"
  try:
      import numpy
  except ImportError:
      print "you should install numpy before continuing"
  
  print "checking for sklearn"
  try:
      import sklearn
  except:
      print "you should install sklearn before continuing"
  
  print
  print "downloading the Enron dataset (this may take a while)"
  print "to check on progress, you can cd up one level, then execute <ls -lthr>"
  print "Enron dataset should be last item on the list, along with its current size"
  print "download will complete at about 423 MB"
  import urllib
  url = "https://www.cs.cmu.edu/~./enron/enron_mail_20110402.tgz"
  urllib.urlretrieve(url, filename="../enron_mail_20110402.tgz") 
  print "download complete!"
  
  
  print
  print "unzipping Enron dataset (this may take a while)"
  import tarfile
  import os
  os.chdir("..")
  tfile = tarfile.open("enron_mail_20110402.tgz", "r:gz")
  tfile.extractall(".")
  
  print "you're ready to go!"
  