Em Sáb, 2006-04-15 às 04:03 +1000, Steven D'Aprano escreveu:
> Sometimes you want the default to mutate each time it is used, for example
> that is a good technique for caching a result:
>
> def fact(n, _cache=[1, 1, 2]):
> "Iterative factorial with a cache."
> try:
> return _cache
On Fri, 14 Apr 2006 13:30:49 -0300, Felipe Almeida Lessa wrote:
> Em Sex, 2006-04-14 às 09:18 -0700, wietse escreveu:
>> def __init__(self, name, collection=[]):
>
> Never, ever, use the default as a list.
Unless you want to use the default as a list.
Sometimes you want the default to mutat
Em Sex, 2006-04-14 às 13:30 -0300, Felipe Almeida Lessa escreveu:
> To solve your problem, change
> def __init__(self, name, collection=[]):
> BaseClass.__init__(self)
> self.name = name
> self.collection = collection # Will reuse the list
> to
> def __init__(self,
Em Sex, 2006-04-14 às 09:18 -0700, wietse escreveu:
> def __init__(self, name, collection=[]):
Never, ever, use the default as a list.
> self.collection = collection
This will just make a reference of self.collection to the collection
argument.
> inst.collection.append(i)
A
Hello,
I have written the following script to illustrate a problem in my code:
class BaseClass(object):
def __init__(self):
self.collection = []
class MyClass(BaseClass):
def __init__(self, name, collection=[]):
BaseClass.__init__(self)
self.name = name
se
