"Shurui Liu (Aaron Liu)" <shuru...@gmail.com> wrote
Sorry, let me specify. I think comptuter will print out those two
sentences like this:
A new critter has been born!
Hi. I'm an instance of class Critter.
A new critter has been born!
Hi. I'm an instance of class Critter.
class Critter(object):
"""A virtual pet"""
def __init__(self):
print "A new critter has been born!"
Here you are calling print inside the constructor (actually the
initialiser)
method which gets called when you create a new object
def talk(self):
print "\nHi. I'm an instance of class Critter."
Here you are calling print inside a method that only gets executed
when explicitly called from the created object
crit1 = Critter()
crit2 = Critter()
Here you create two objects so the constructor method will be executed
twice.
So you get the message
A new critter has been born!"
twice.
crit1.talk()
crit2.talk()
Then you call the talk method for each object so you get
Hi. I'm an instance of class Critter.
twice.
The __init__() method is nothing too special. It gets called
automatically when you create the object is all. You can think
of
crit = Critter()
as effectively being a call to Critter.__init__()
There is a little bit more to it that that but most of the time its
close enough.
You can read an alternative explanation in the OOP topic
of my tutorial...
--
Alan Gauld
Author of the Learn to Program web site
http://www.alan-g.me.uk/
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