Jason Tackaberry wrote: > On Mon, 2008-03-17 at 15:42 +0100, Duncan Webb wrote: > >> class A: >> def __init__(self, l=[]): >> self.l = l >> > > Note that this creates a default list for l only once at > class-declaration time. All instances of A will share this list. This > is a common python gotcha. You might want instead: > > class A: > def __init__(self, l=None): > self.l = l or [] > > > >> This behaviour seems a bit strange, clearly list is class A is the same >> objects for both instances and I'm wondering if this is correct? >> > > Yes, it's expected behaviour. >
Thanks both Jason and James, it makes sense that the list is created when the method is first parsed, this is something that I need to watch out for. I guess that this is only a problem for mutable objects, so strings and numbers are not a problem. Duncan ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Freevo-devel mailing list Freevo-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freevo-devel
