title: python AttributeError: module 'math' has no attribute 'comb'
body: <p>I'm getting an error when I try to use the 'comb' function:</p>
  <pre><code>$ python
  Python 3.7.1 (default, Dec 14 2018, 13:28:58) 
  [Clang 4.0.1 (tags/RELEASE_401/final)] :: Anaconda, Inc. on darwin
  Type &quot;help&quot;, &quot;copyright&quot;, &quot;credits&quot; or &quot;license&quot; for more information.
  &gt;&gt;&gt; import math
  &gt;&gt;&gt; print(math.comb(6,49))
  Traceback (most recent call last):
    File &quot;&lt;stdin&gt;&quot;, line 1, in &lt;module&gt;
  AttributeError: module 'math' has no attribute 'comb'
  &gt;&gt;&gt; 
  </code></pre>