On Thu, May 28, 2020 at 3:50 AM Alex Hall <alex.moj...@gmail.com> wrote:
> On Thu, May 28, 2020 at 12:38 PM Greg Ewing <greg.ew...@canterbury.ac.nz> > wrote: > >> >> But I'm having trouble thinking of one. I can't remember ever >> writing a function with a default argument value that *has* to >> be mutable and *has* to have a new one created on each call >> *unless* the caller provided one. >> > Actually, we need to one further: a default argument value that *has* to be mutable and *has* to have a new one created on each call *unless* the caller provided one ... and *has* to treat None as valid value. That I'm really having trouble with :-) -CHB -- Christopher Barker, PhD Python Language Consulting - Teaching - Scientific Software Development - Desktop GUI and Web Development - wxPython, numpy, scipy, Cython
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