because input does not work when executed in a for loop

Question

my intention is to execute an input N number of times by using a for loop. However, the code I wrote doesn't behave the way I expect it to.

Here I share my code:

N, K = map(int, input().split())

values = (list(map(int, input().split()))[1:] for _ in range(N))
print(values)

When I execute the code the program ends without executing the inputs. Also, when I try to print the output, I get the following output:

<generator object <genexpr> at 0x000001D040ED03C0>

Here is a sample of how the program should work:

SampleInput

3 1000
2 5 4
3 7 8 9
5 5 7 8 9 10

in this case, N would be equal to 3, therefore 3 inputs should be executed

If your intention is to use a for loop, shouldn't there be a for loop somewhere in your code? — Mark
– Mark, Commented Aug 2, 2022 at 4:33
values = [list(map(int, input().split()))[1:] for _ in range(N)], using ( ...) create generator expresion — sahasrara62
– sahasrara62, Commented Aug 2, 2022 at 4:34
Can you please provide an example of what you expect out of the program? Like, give us a sample of the user input and then what you expect the output to look like. — Chowlett2
– Chowlett2, Commented Aug 2, 2022 at 4:36
If you want values as a list, instead of generator expression use list comprehension — kuro
– kuro, Commented Aug 2, 2022 at 4:36
do you really want to enter multiple numbers N times or just one number N times? Do you need the split in the second line? It may be clearer if you show your expected output for a given set of inputs. — Paul Rooney
– Paul Rooney, Commented Aug 2, 2022 at 5:57

Lanbao · Accepted Answer · 2022-08-02 05:40:58Z

1

Just fix your code like this

values = [list(map(int, input().split()))[1:] for _ in range(N)]

Instead of list comprehension, you can for in values like this

for i in values:
    print(i)

answered Aug 2, 2022 at 5:40

Lanbao

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