Why does argparse return None instead of [] if an append action isn't used?

Adam Funk a24061 at ducksburg.com
Mon Jan 26 14:43:36 CET 2015


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 []:" ?


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