text: 
  # coding: utf-8
  
  import sys
  import numpy
  import matplotlib.pyplot
  
  
  def analyse (filename, outfile=None):
      data = numpy.loadtxt(fname=filename, delimiter=',')
      
       #Create a wide figure to hold subplots
      fig = matplotlib.pyplot.figure (figsize=(10.0, 3.0))
      #create placeholders for plots
      subplot1 = fig.add_subplot (1,3,1)
      subplot2 = fig.add_subplot (1,3,2)
      subplot3 = fig.add_subplot (1,3,3)
  
      subplot1.set_ylabel('average')
      subplot1.plot(numpy.mean(data, axis=0))
  
      subplot2.set_ylabel('minimum')
      subplot2.plot(numpy.min(data, axis=0))
  
      subplot3.set_ylabel('maximum')
      subplot3.plot(numpy.max(data, axis=0))
  
  #    fig.tight_layout()
      if outfile is None:
          matplotlib.pyplot.show()
      else: 
          matplotlib.pyplot.savefig(outfile)
      
  
  
  def detect_problems (filename): 
      """Some of our temperature files have problems, check for these
      
         This functions reads a file (filename argument) and reports on odd looking maxima and minima that add up to zero. This seems to 
         happen when the sensors break.
         The function does not return any data
      """ 
      
      data = numpy.loadtxt(fname=filename, delimiter=',')
      
      if numpy.max (data, axis=0)[0] == 0 and numpy.max (data, axis=0)[20] ==20:
          print ("Suspicious looking maxima")
      elif numpy.sum(numpy.min(data, axis=0)) == 0:
          print ("Minima add up to zero")
      else:
          print ("Data looks OK")
  
  if __name__== "__main__":
      print("Running", sys.argv[0])    
  
      print (sys.argv[1])
      analyse (sys.argv[1], outfile=sys.argv[2])
      detect_problems (sys.argv[1])