list of the lists - append after search
gvmcmt at gmail.com
gvmcmt at gmail.com
Sun Mar 5 11:09:01 EST 2017
On Thursday, March 2, 2017 at 9:33:14 PM UTC+5:30, Andrew Zyman wrote:
> Hello,
> please advise.
>
> I'd like search and append the internal list in the list-of-the-lists.
>
> Example:
> ll =[ [a,1], [b,2], [c,3], [blah, 1000] ]
>
> i want to search for the internal [] based on the string field and, if matches, append that list with a value.
>
> if internal_list[0] == 'blah':
> ll[ internal_list].append = [ 'new value']
>
> End result:
> ll =[ [a,1], [b,2], [c,3], [blah, 1000, 'new value'] ]
>
>
> I came up with the following, but the second stmnt is not correct:
>
> print [x for x in ll if x[0]== 'blah']
> print ll.index([x for x in ll if x[0]=='blah'])
>
> output:
> ValueError: [['blah', 1]] is not in list
>
>
>
>
> thank you
> AZ
list_of_lists = [['a', 1], ['b', 2], ['c', 3], ['blah', 1000]]
for sublist in list_of_lists:
if sublist[0] == 'blah':
sublist.append('new value')
Hope that helps.
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