title: iPython line continuation of command shell string literal
body: <p>In iPython, when using the command shell command (the exclamation point operator), is there a way to do line continuation of long string literals?</p>
  
  <p>E.g.</p>
  
  <pre><code>t = !echo "Hello"\
  "World"
  t
  </code></pre>
  
  <p>produces ['Hello'] as the value for t instead of the expected ['HelloWorld'].</p>