"""example.py  Module  docstring.

example.py DoesSomething to infilename Producing outfilename 

Usage:   example.py infileName outfileName
Example: example.py in.txt     out.txt

"""

class Simple:
  def __init__(self, str, str2):    #the Simple constructor"
    # You must explicitly call any base-class constructor:
    #    SimpleBass.__init__(self, str)

    # Two instance variables:
    self.s = str        
    self.s2 = str2

  # Four methods:
  def show(self):
    print (self.s)
  def show2(self):
    print (self.s2)
  def showMsg(self, msg):
    self.printTheMsg(msg)  # Calling another method
    pm = self.printTheMsg  # Make the method call shorter
    pm(msg)                # Call the method again
  def printTheMsg(self, msg):
    print (msg)


def main(argv=None):
  N_ARGS = 2
  import sys
  if argv == None: argv=sys.argv
  args = argv[1:]  #NOTE: args[0] != argv[0] == <full path to example.py>
  if len(args) != N_ARGS or "-h" in args or "--help" in args:
    print (__doc__)
    sys.exit(2)
    
  # Create an object:
  smp = Simple(args[0], args[1])
  smp.showMsg('we did example.py to')
  smp.show()
  smp.showMsg('yielding')
  smp.show2()
  

if __name__ == "__main__":
   sys.exit(main())