python: append only specific elements from a list -

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i have list of list:

b=[[1,2,3],[4,5,6],[7,8,9]]

i have list:

row = [1,2,3]

how append b row[0] , '3847' , row[2] such b equal:

b=[[1,2,3],[4,5,6],[7,8,9],[1,3847,3]]

you're going have more specific.

this accomplish want:

b.append([row[0], 3847, row[2]])

but isn't general solution.


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