Why does argparse return None instead of [] if an append action isn't used?
Adam Funk
a24061 at ducksburg.com
Mon Jan 26 08:43:36 EST 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 []:" ?
--
War is God's way of teaching Americans geography.
[Ambrose Bierce]
More information about the Python-list
mailing list