how do i make an array global

Bruno Desthuilliers onurb at xiludom.gro
Wed Jun 28 17:53:28 CEST 2006


Georg Brandl wrote:
> Bruno Desthuilliers wrote:
> 
>>a wrote:
>>
>>>def fn():
>>>     for i in range(l)
>>
>>l is not defined - you should have an error here.
>>
>>
>>>           global count
>>>           count[i]= ....
>>>
>>>how do i declare count to be global if it is an array
>>
>>Just like it was an integer
> 
> 
> No. If he's only mutating "count", he doesn't need a global
> declaration.

Did I said so ? I just answered the OP's question. If that's the 'int'
that confuse you, then s/int/dict/ - what I meant is that the global
statement doesn't care about types...

> 
>>>subsequently i should access or define count as an array
>>
>>You need to define count before.
>>
>>
>>>error:
>>>global name 'count' is not defined
>>
>>He...
>>
>>*but*
>>You probably should not do that anyway. Globals are *evil*.
>  
> Do you realize that every variable you set in a module's namespace is a
> global when used by a function?

Going to teach me Python, Georg ?-) Then let's be accurate first, and
s/variable you set/name you bind/

>  Globals are *not* evil.

Yes they are.

>>And functions modifying globals is the worst possible thing.
>>There are very few chances you *need* a global here.
>  
> Look at the use case first.

The use case here is to avoid either passing a list as param or building
and returning it - and the OP is obviously a newbie, so better for him
to learn the RightThing(tm) from the beginning IMHO.

> For small scripts, sometimes re-assigning global names or mutating objects
> refered to by global names is essential.

s/is essential/seems easier/

Then you or anyone else has to make a quick fix or update, and
everything starts to break down. Too bad.


-- 
bruno desthuilliers
python -c "print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in 'onurb at xiludom.gro'.split('@')])"



More information about the Python-list mailing list