Re: [Python-ideas] fixing mutable default argument values

Joel Bender <jjb5@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.

[snip]

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 . - Josiah