I have a nested list e.g.:
nlist = [
[1, 2, 3],
[4, 5, 6],
[7, 8, 9],
]
Before I insert this list into a database, I would like to add a "column" to it with the same value in each row of the new column e.g:
nlist = [
[a, 1, 2, 3],
[a, 4, 5, 6],
[a, 7, 8, 9],
]
What's the best way to do this, when, for example, the original nested list might have hundreds of rows?
Why not change the original list (if that is all you want to do):
for row in nlist:
row.insert(0, a)
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