append to non-existing list

[Yves Glodt]

Max M wrote:
> Yves Glodt wrote:
>> bruno at modulix wrote:
>>
>>> Yves Glodt wrote:
>>>
>>>> Hello,
>>>>
>>>> if I do this:
>>>>
>>>> for row in sqlsth:
>>>> ________pkcolumns.append(row[0].strip())
>>>> ________etc
>>>>
>>>>
>>>> without a prior:
>>>>
>>>> pkcolumns = [];
>>>>
>>>>
>>>> I get this error on first iteration:
>>>> UnboundLocalError: local variable 'pkcolums' referenced before 
>>>> assignment
>>>>
>>>>
>>>> I guess that's normal as it's the way python works...?!?
> 
> 
> Well you could do something like this. (Untested and unrecommended)
> 
>      self.__dict__.setdefault('pkcolumns', []).append(row[0].strip())
> 
> Personally I find
> 
>      pkcolumns = []
>      pkcolumns .append(row[0].strip())
> 
> to be nicer ;-)

Yes me too, I'm gonna stick to that... :-)