How to append an array of space-separated integers input in an array in python?

Question

I want to append user input of space-separated integers, as integers not array, into a formed array. Is there a way to do this?

Here is a pseudo-code:

a=[1,2,3,4]
a.append(int(input().split())
print(a)

I want it to be time-efficient, this is what I tried:

a=[1,2,3,4]
b=list(map(int, input().rstrip().split()))
a.extend(b)
print(a)

Is there a more efficient / faster way?

Expected output:

[1, 2, 3, 4, 5, 6, 7, 8]
# When input is '5 6 7 8'

If it's user input, the time efficiency won't matter, as the user'll take way more time to type in (or pipe from a file) the input than it can basically ever take for your code to parse things. — AKX
– AKX, Commented Jun 27, 2020 at 14:49
This is just for ease of explanation of the question. The point of the question is time efficiency. I want to take input and append it into a list. There is a longer code ahead. I just wanted to know if there is a fast way to do it. (Like appending the input while taking it, which would be possible if the input was given one by one.) — Suraj Ajay Duvadi
– Suraj Ajay Duvadi, Commented Jun 28, 2020 at 12:42
Reading and parsing one-by-one would be slower. Your way is reasonably fast, in any case, but in the grand scheme of things it likely won't matter (and when you profile your larger program and find integer reading to be a bottleneck, you can speed it up). — AKX
– AKX, Commented Jun 29, 2020 at 6:05

Anwarvic · Accepted Answer · 2020-06-27 14:51:12Z

2

You can do so:

a=[1,2,3,4]
a.extend(map(int, input().split()))
print(a)
#[1, 2, 3, 4, 5, 6, 7, 8]

answered Jun 27, 2020 at 14:51

Anwarvic

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Comments

Prabhu Teja · Accepted Answer · 2020-06-27 14:56:49Z

0

You can also do it as :

a=[1,2,3,4]
b=list(map(int, input().rstrip().split()))
for i in b:
    a.append(i)
print(a)

answered Jun 27, 2020 at 14:56

Prabhu Teja

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Apoorv Mehta · Accepted Answer · 2020-06-27 14:59:55Z

0

You can do so by joining two lists using '+' operator -

a = [1,2,3,4]
result = list(map(int, input().split())) + a

[5, 6, 7, 8, 1, 2, 3, 4]

answered Jun 27, 2020 at 14:59

Apoorv Mehta

1021 bronze badge