title: a forgotten simple way to convert list of list to list of tuple: [[1,2], [3,4]] -> [(1,2), (3,4)]
body: <p>Half a year ago, when I was using <a href="https://vedo.embl.es/#refs" rel="nofollow noreferrer"><code>vedo</code></a> (a python module for visualization), I happened to learned that there is a simple way to convert list of list to list of tuple, for example</p>
  <pre><code> [[1, 2], [3, 4]] -&gt; [(1, 2), (3, 4)],
  </code></pre>
  <p>by using <strong><code>.r_[a, b]</code></strong>(or <strong><code>._r[a, b]</code></strong> ? ), where <strong><code>a</code></strong> and <strong><code>b</code></strong> are some axis parameters(?).</p>
  <p>Unfortunately, however I tried to search it on the Internet today, I can't found any evidence of such a way (np.r_ can't do that).
  So I want to know does it ever exist, if so can somebody teach me how to use it, thanks.</p>