백준 10814 - 나이순 정렬 (파이썬)

Answer

a = [list(input().split()) for _ in range(int(input()))]

a.sort(key = lambda b : int(b[0]))
        
for i in a:
    print(*i)

Answer2

from sys import stdin, stdout

users_by_age = [[] for _ in range(200+1)]

for line in stdin.read().splitlines(True)[1:]:
    users_by_age[int(line.split()[0])].append(line)

stdout.write(''.join(
    ''.join(u)
    for u in
    users_by_age
))