Yes, I used IPython a lot.<p>What I meant by better interactive interface is that the language itself is designed with interactive use in mind.<p>For instance compare<p><pre><code>  func(x$a, x$b)
  func(a, b, data=x)
  func(a=1, b=2)
</code></pre>
with<p><pre><code>  func(x[&#x27;a&#x27;], x[&#x27;b&#x27;])
  func(&#x27;a&#x27;, &#x27;b&#x27;, data=x)
  func([1, 2], [&#x27;a&#x27;, &#x27;b&#x27;])
</code></pre>
The R versions are easier to type and read.