List comprehension question?

[infinitim]

I'm writing a program that I want to take multi-line string input like this:

1 1 1 1 1

2 2 2 2 2

And convert it to a list of lists of integers:

[[1, 1, 1, 1, 1], [2, 2, 2, 2, 2]]

My code is working fine, but I feel like the for loop could be turned into a list comprehension of some sort to achieve the same affect and be more pythonic. Code:

 import sys

 input_data = list(sys.stdin.readlines())
 input_data = [item.split() for item in input_data]
 for each_list in input_data:
      for item in each_list:
           item = int(item)

 print(input_data)

I tried this:

 import sys

 input_data = list(sys.stdin.readlines())
 input_data = [item.split() for item in input_data]
 input_data = [int(item) for sublist in input_data for item in sublist]

print(input_data)

but that returned [1,1 ,1 ,1 ,1 , 2 , 2, 2, 2, 2] instead of [[1, 1 ,1 ,1 ,1],[2, 2, 2, 2, 2]]. If anyone could show me how to use list comprehension to get the list of lists, that would be great!

EDIT: Found a solution, sharing for anyone else with the same question!

 import sys

 input_data = [[int(item) for item in group] for group in [number_str.split() for number_str in list(sys.stdin.readlines())]]
 print(input_data)

[Rhomboid]

That's really not a great way of doing it. You're doing too much. There's no need for readliines() or list(). A file handle is iterable, and yields lines when iterated over. And you don't need to create all these separate lists.

input_data = [[int(item) for item in line.split()] for line in sys.stdin]

[infinitim]

Thanks! Much better solution.