Paul Rubin wrote:
> Lie Ryan <lie.1...@gmail.com> writes:
>> I guess in python, None as the missing datum idiom is still quite prevalent:
>
> Well, sometimes there is no way around it, but:
>
>> def cat_list(a=None, b=None):
>> # poor man's list concatenation
>> if a is None and b is None: return []
>> if a is None: return b
>> if b is None: return a
>> return a + b
>
> def cat_list(a=[], b=[]):
> return a + b
Being super contrived is why I tagged it as poor man's concat.
Generally, there will be a processing:
...
if b is None: return a
# processing here
return retlist
...
and it will not be about concatenating two lists, but something more
complex. But I thought that was unnecessary since I just want to mention
about the None argument idiom.
--
http://mail.python.org/mailman/listinfo/python-list
