how to delete multiple elements from a list

[Rodrigo Senra]

Mikael Olofsson wrote:
> 
> On 14-Nov-00 etsang at my-deja.com wrote:
>  >  I have a List X with N number of items in it. I have another List Y
>  >  which contains the postion of the elements to be deleted from List X.
>  >  I cannot do a for loop to delete that because for each iteration, List
>  >  X will be changed and there will be sliperage.
> 
> You _can_ do that with a loop. Just make sure that you have Y in reverse
> order.
> 
> Y.sort()
> Y.reverse()
> for y in Y:
>   del X[y]

x=[1,2,3,4]
y=[1] # want to delete element-2 at index 1
x.reverse()

x.del(y[0]) # not yet! must correct List Y too

Mikael Olofsson wrote:
> I will leave that one to someone else.
# that's my  call!

ny=map(lambda a,b=len(x)-1:b-a,y) # to fix y list saving at ny
# That should correct the indexes 4 u. But check it out, I haven't
tested it
HTH

-- 
Rodrigo Senra         
Computer Engineer   (GPr Sistemas Ltda)  rodsenra at correionet.com.br 
MSc Student of Reflection (IC- UNICAMP) Rodrigo.Senra at ic.unicamp.br
http://www.ic.unicamp.br/~921234 (see also   http://www.gpr.com.br)