list of lists

Peter Otten __peter__ at
Mon Sep 15 16:58:46 CEST 2003

Tom wrote:

> Hi,
> I have a list that consists of lists.
> E.g. T=[[1, 2, 3], [4, 5], [6]]
> Is there a way to address the a specific component in the "inner" list
> directly?
> E.g. right now I want to get the second value of the first list.
> Unfortunately I have to save it to a variable first and then read it.
> a = T[0]
> print a[1]
> That kind of sucks, becaus I have to read a lot of values from a lot of
> lists! :-(
> Is there a faster way than my saving it to a "help variable" first?
> Thanks folks!!
> Regards, Tom

Your example rather than your problem specification suggests that you want
them all. If I'm guessing right:

def flatten(lol):
    for lst in lol:
        for item in lst:
            yield item

T=[[1, 2, 3], [4, 5], [6]]

for item in flatten(T):
   print item

Indices seem to be a dying breed :-)


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