Re: [Tutor] Re: Help with classes (Joseph Q.)

[Kent Johnson]

Joseph Quigley wrote:
class Message:
  def init(self, p = 'Hello world'):
     self.text = p
  def sayIt(self):
     print self.text
m = Message()
m.init()
m.sayIt()
m.init('Hiya fred!')
m.sayIt()
This is OK but a more conventional usage is to write an __init__() method. This is sometimes called 
a constructor and it is called automatically when you make a new class instance. Using __init__() 
your example would look like this:

class Message:
  def __init__(self, p = 'Hello world'):
     self.text = p
  def sayIt(self):
     print self.text
m = Message()
m.sayIt()
m = Message('Hiya fred!')
m.sayIt()
though this is nemantically a little different than yours because I create a new Message with the 
new string while you reuse the old one.

Kent
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