List input and list created different

Question

When I create list as

a=[5,6,8,7]; print(a)

it shows output as

[5, 6, 8, 7]

and when take input as

b=list(input());print(b)

it shows output as

['5', '6', '7', '8']

why and what is difference in that. I can add 5 and 6 as 11 but in second adding 5 and 6 is 56 ?

score 1 · Accepted Answer · answered Jun 14 '19 at 12:30

1

It's because input() returns a string and + is thus doing string concatenation. From the input() documentation:

The function then reads a line from input, converts it to a string (stripping a trailing newline), and returns that.

answered Jun 14 '19 at 12:30

TomNash

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@briangrey, consider marking an answer as the accepted answer. – shrewmouse Jun 14 '19 at 12:48

score 0 · Answer 2 · answered Jun 14 '19 at 12:29

0

input() returns a string, list(input()) extracts its individual characters and puts them in a list. Adding individual characters, which are strings of one character, produces a new string:

'5' + '6' == '56'
5 + 6 == 11

To convert a list of strings to a list of integers, use map:

integers = list(map(int, input()))

answered Jun 14 '19 at 12:29

ForceBru

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"Use map"...or use [list comprehension](https://docs.python.org/2/tutorial/datastructures.html#list-comprehensions): `integers = [int(c) for c in input()]` – Leporello Jun 14 '19 at 12:36

List input and list created different

2 Answers2