title: Multiline user input with list comprehension in Python 3
body: <p>Total newb to Python here. I'm working on CodeAbbey's problems using Python 3, and I'd like help to make the code for user input shorter.</p>
  
  <p>Let's say I want to get this input from the user:</p>
  
  <pre><code>3
  2 3
  4 5
  6 7
  </code></pre>
  
  <p>First line is number of cases, and each of the following lines are the cases themselves with 2 parameters. I've figured out to do it in this way so far:</p>
  
  <pre><code>N=int(input('How many cases will you calculate?\n'))
  print('Input parameters separated by spaces:')
  entr = [list(int(x) for x in input().split()) for i in range(N)]
  </code></pre>
  
  <p>The thing is I'd rather to ask all the input in the list comprehension, and then assign N=entr[0]. But how do I get the list comprehension to break the input into lines without using range(N)? </p>
  
  <p>I tried:</p>
  
  <pre><code>entr = [list(int(x) for x in input().split()) for x in input()]
  </code></pre>
  
  <p>but it doesn't work.</p>