Why does argparse return None instead of [] if an append action isn't used?
Peter Otten
__peter__ at web.de
Mon Jan 26 09:04:51 EST 2015
Adam Funk wrote:
> On 2015-01-09, Ned Batchelder wrote:
>
>> On 1/9/15 9:44 AM, Adam Funk wrote:
>>> This makes it a bit more trouble to use:
>>>
>>> if options.bar:
>>> for b in options:bar
>>> do_stuff(b)
>>>
>>> instead of
>>>
>>> for b in options.bar
>>> do_stuff(b)
>>
>> This doesn't answer why the value defaults to None, and some people may
>> recoil at it, but I've used:
>>
>> for b in options.bar or ():
>> do_stuff(b)
>
> Do you mean "for b in options.bar or []:" ?
Doesn't matter; in the context of a for loop any empty iterable would do.
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