On Dec 30, 2:45 pm, Istvan Albert <[EMAIL PROTECTED]> wrote:
> On Dec 30, 5:23 am, thebjorn <[EMAIL PROTECTED]>
> wrote:
>
> > def age(dob, today=datetime.date.today()):
> > ...
>
> > None of my unit tests caught that one :-)
>
> interesting example I can see how it caused some trouble. A quick fix
> would be to write it:
>
> def age(dob, today=datetime.date.today ):
>
> and inside the definition invoke it as today() rather than just today.
> That way it still keeps the original spirit of the definition.
>
> i.
The purpose of the argument was to be able to calculate the age at a
given point in time -- i.e. was the person 18 y/o at the time of the
incident?
Our coding standard now dictates:
def foo(arg=None):
if arg is None:
arg = <default mutable value>
(unless there's a very good reason to do it otherwise :-)
a close runner-up, that we specifically opted not to allow was
def foo(arg={}):
arg = arg or {}
even though it looks sexy and it's perhaps a bit more self-documenting
in some IDEs, it was rejected because it prevents "false" overrides of
the default argument.
For purely practical reasons we couldn't consider
def foo(arg=None):
arg = <default mutable value> if arg is None else arg
-- bjorn
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