From random import randint N=int(input()) a=[[0 for i in range(N)] for j in range(N)] b= [[0 for i in range(N)] for j in range(N)] for i in range(0,N): for j in range(0,N): a[i][j]=randint(1,30) for i in a: print(i) print() for i in range(0,N): b=sorted(a[i])

Ошибка в коде, который вы предоставили. Вот исправленная версия:

from random import randint

N = int(input())
a = [[0 for i in range(N)] for j in range(N)]
b = [[0 for i in range(N)] for j in range(N)]

for i in range(N):
    for j in range(N):
        a[i][j] = randint(1, 30)

for i in a:
    print(i)

print()
for i in range(N):
    b[i] = sorted(a[i])

for i in b:
    print(i)

Надеюсь, это поможет!