Code redundancy

Alan Harris-Reid aharrisreid at googlemail.com
Tue Apr 20 17:50:10 EDT 2010


Iain King wrote:
> On Apr 20, 2:43 pm, Alan Harris-Reid <aharrisr... at googlemail.com>
> wrote:
>   
>> Hi,
>>
>> During my Python (3.1) programming I often find myself having to repeat
>> code such as...
>>
>> class1.attr1 =
>> class1.attr2 =
>> class1.attr3 =
>> class1.attr4 =
>> etc.
>>
>> Is there any way to achieve the same result without having to repeat the
>> class1 prefix?  Before Python my previous main language was Visual
>> Foxpro, which had the syntax...
>>
>> with class1
>>    .attr1 =
>>    .attr2 =
>>    .attr3 =
>>    .attr4 =
>>    etc.
>> endwith
>>
>> Is there any equivalent to this in Python?
>>
>> Any help would be appreciated.
>>
>> Alan Harris-Reid
>>     
>
> The pythonic equivalent of VB 'with' is to assign to a short variable
> name, for example '_':
>
> _ =lass1
> _.attr1 =
> _.attr2 =
> _.attr3 =
> _.attr4 =
>
> alternatively, you could use the __setattr__ method:
>
> for attr, value in (
>     ('attr1', 1),
>     ('attr2', 2),
>     ('attr3', 3),
>     ('attr4', 4)):
>     class1.__setattr__(attr, value)
>
> and to get a bit crunchy, with this your specific example can be
> written:
>
> for i in xrange(1, 5):
>     class1.__setattr__('attr%d' % i, i)
>
> Iain
Hi Iain, thanks for the reply,

Like the _. prefix idea - I didn't know _ could be used as a variable name.

>for i in xrange(1, 5):
>    class1.__setattr__('attr%d' % i, i)


Good solution if the values matched the attribute names, but 
unfortunately they don't.  That was just a (bad) example to illustrate 
my problem.

Regards,
Alan




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