how do i append two nested list into single nested list in python

Question

i have two nested list like:

a = [[2,3,4],[3,5,6]]
b = [[4,5], [5,6,7,7,7]]

i need to append two nested list into single nested list.

Expected output:

[[4, 5], [5, 6, 7, 7, 7], [2, 3, 4], [3, 5, 6]]

I tried this way,

a = [[2,3,4],[3,5,6]]
b = [[4,5], [5,6,7,7,7]]
b.append(a)
print(b)

output i got:

[[4, 5], [5, 6, 7, 7, 7], [[2, 3, 4], [3, 5, 6]]]

Any suggestions would be helpful!

Use extend method of the list object.

user459872
– user459872

2020-03-10 14:19:48 +00:00
Commented Mar 10, 2020 at 14:19 — user459872
– user459872, Commented Mar 10, 2020 at 14:19

sloppypasta · Accepted Answer · 2020-03-10 14:19:10Z

2

Just create a new list:

a = [[2,3,4],[3,5,6]]
b = [[4,5], [5,6,7,7,7]]
c = a + b
# [[2, 3, 4], [3, 5, 6], [4, 5], [5, 6, 7, 7, 7]]

answered Mar 10, 2020 at 14:19

sloppypasta

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Comments

zipa · Accepted Answer · 2020-03-10 14:20:37Z

2

Unpacking is one way of doing it:

c = [*a, *b]
# [[2, 3, 4], [3, 5, 6], [4, 5], [5, 6, 7, 7, 7]]

answered Mar 10, 2020 at 14:20

zipa

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Comments

PKumar · Accepted Answer · 2020-03-10 14:20:26Z

1

Use .extend, given

a = [[2,3,4],[3,5,6]]
b = [[4,5], [5,6,7,7,7]]
b.extend(a)

Note: the .extend method extends the existing list and changes made are in the list on which .extend is performed, so here changes are made to b

output:

[[4, 5], [5, 6, 7, 7, 7], [2, 3, 4], [3, 5, 6]]

answered Mar 10, 2020 at 14:20

PKumar

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