[Tutor] designing a class
kent37 at tds.net
Fri Jan 27 17:49:00 CET 2006
Christopher Spears wrote:
>> def __init__(self, aList=None):
>> if aList is None:
>> self._list = 
>> self._list = aList[:]
> This code certainly looks like it will do the trick.
> I'm just not sure what the _ in front of list (i.e.
> _list) denotes.
It's a convention that indicates a private attribute. Think of it as
telling clients, "This is for my private use, it may change at any time."
In this case it was also a way to avoid using 'list' as the name of the
attribute. 'list' is the name of a built-in - it shouldn't be used as a
variable name because it will shadow the built-in. In the case of an
attribute it doesn't really matter but I have a strong habit of not
using 'list' as a name.
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