On 05/08/2015 06:53 AM, Frank Millman wrote:
"Steven D'Aprano" <steve+comp.lang.pyt...@pearwood.info> wrote in message
news:554c8b0a$0$12992$c3e8da3$54964...@news.astraweb.com...
On Fri, 8 May 2015 06:01 pm, Frank Millman wrote:
Hi all
[...]
However, every time I look at my own code, and I see "def x(y, z=[]):
....." it looks wrong because I have been conditioned to think of it as
a gotcha.
It might be appropriate to define the list at top-level, as
EMPTY_LIST=[]
and in your default argument as
def x(y, z=EMPTY_LIST):
and with the all-caps, you're thereby promising that nobody will modify
that list.
(I'd tend to do the None trick, but I think this alternative would be
acceptable)
--
DaveA
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