title: Python - split string into two columns
body: <p>Let's say I have this string:</p>
  
  <pre><code>"""line1
  line2
  line3
  line4
  line5
  line6
  line7
  line8"""
  </code></pre>
  
  <p>I want to write a function to split it into two equal-sized columns represented by a single string, like so:</p>
  
  <pre><code>"""line1 line5
  line2 line6
  line3 line7
  line4 line8"""
  </code></pre>
  
  <p>I can split the string in two like this:
  s1,s2 = s[:len(s)//2], s[len(s)//2:]</p>
  
  <p>But then I'm unsure on how to combine them...</p>