In article <[email protected]>,
Steven D'Aprano <[email protected]> wrote:
>On Thu, 25 Mar 2010 18:03:58 -0700, C. B. wrote:
>>
>> from mymodule import AAA
>> from mymodule import BBB
>>
>> a = AAA(BBB()))
>>
>> But, as there is no case where AAA can be used without BBB, I would like
>> to avoid importing BBB in my Python scripts when I already import AAA.
>
>Since AAA must take an argument of BBB, then give it a default:
>
># in mymodule
>def AAA(arg=BBB()):
> ...
That would frequently give wrong results unless BBB is explicitly
designed to create immutable instances. I strongly suggest doing the
usual mutable dance:
def AAA(arg=None):
if arg is None:
arg = BBB()
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