title: Join vectors strings on Python
body: <p>In <code>R</code> I can join together a vector of strings using <code>paste</code>:</p>
  
  <pre><code>&gt; a = 1:3
  &gt; a
  [1] 1 2 3
  
  &gt; b = 4:6
  &gt; b
  [1] 4 5 6
  
  &gt; d = 7:9
  &gt; d
  [1] 7 8 9
  
  &gt; together = paste(a, b, d, sep='-')
  &gt; together 
  [1] "1-4-7" "2-5-8" "3-6-9"
  </code></pre>
  
  <p>How can i do the same in Python ?</p>