Hackerrank stdin & stdout for python

stdin.py

"""
Hackerrank: read from STDIN

raw_input: read a line from STDIN and returns a string

number per line:
n = int(raw_input())

space-seperated numbers in line:
arr = map(int, raw_input().split())

"""

def main():
  t = int(raw_input())
  
  for _ in xrange(t):
    a, b = map(int, raw_input().strip().split(' '))
    
main()

This doesn't work as presented

def main():
  t = int(raw_input())
  
  for _ in xrange(t):
    a, b = map(int, raw_input().strip().split(' '))
  print(a,b)
    
main()

Traceback (most recent call last):
  File "solution.py", line 8, in 
    main()
  File "solution.py", line 5, in main
    a, b = map(int, raw_input().strip().split(' '))
ValueError: need more than 1 value to unpack

Please revise or take this down.