On Wed, 14 Feb 2007 21:12:39 -0800, placid wrote:
> On Feb 15, 4:04 pm, Grant Edwards <[EMAIL PROTECTED]> wrote:
>> On 2007-02-15, placid <[EMAIL PROTECTED]> wrote:
>>
>>
>>
>> > Is it possible to be able to do the following in Python?
>>
>> > class Test:
>> > def __init__(self):
>> > pass
>>
>> > def puts(self, str):
>> > print str
>>
>> > def puts(self, str,str2):
>> > print str,str2
>>
>> > if __name__ == "__main__":
>> > t = Test()
>> > t.puts("hi")
>> > t.puts("hi","hello")
>>
>> You tell us: what happened when you tried it?
>
> Well, when i run it i get this error "puts() takes exactly 3 arguments
> (2 given)" which means that the second a time i try to define the
> puts() method "overwrites" the first one
Yes, that's right. It is no different from doing this:
x = 1
x = 2
>> And then what happens when you do this?
>>
>> class Test:
>> def __init__(self):
>> pass
>>
>> def puts(self, *args):
>> print ' '.join(args)
>>
>> if __name__ == "__main__":
>> t = Test()
>> t.puts("hi")
>> t.puts("hi","hello")
>
> but this isn't overloading.
Neither was your first example.
This is an example of overloading:
class Cheese(object):
def flavour(self):
return "tasty and scrumptious"
def colour(self):
return "yellow"
Now we define a sub-class which overloads some methods:
class BlueVein(Cheese):
def colour(self):
return "white with blue veins"
Testing it:
>>> c = BlueVein()
>>> c.flavour() # inherited from the super class
'tasty and scrumptious'
>>> c.colour() # over-ridden by the sub-class
'white with blue veins'
>>> super(BlueVein, c).colour() # call the super class method
'yellow'
I hope this helps.
--
Steven D'Aprano
--
http://mail.python.org/mailman/listinfo/python-list
