[Python-ideas] fixing mutable default argument values
jcarlson at uci.edu
Thu Jan 18 17:42:00 CET 2007
Joel Bender <jjb5 at cornell.edu> wrote:
> Calvin Spealman wrote:
> > I dont understand how that would be different than doing
> > c = c if c is not None else Bar([2,3,4])
> Because that would be calling Bar(), perhaps creating a new Bar object,
> every time foo() is called with None for c, which is not what a default
> argument values are about. I'm proposing a way to create function local
> singleton objects, removing them from the parameter list.
> and then hoping that nobody calls foo() with a history parameter.
With your proposal, you are seeking to attempt to fix a "problem" that
no one has complained about. -1 .
More information about the Python-ideas