Unable to download nltk data
<pre><code>import nltk
nltk.download()
</code></pre>

<p>It shows <code>[SSL:CERTIFICATE_VERIFY_FAILED]</code>. In case of <code>requests</code> one can use <code>verify=False</code>, but what to do here.</p>

<p>UPDATE:</p>

<p>This error persists on Python 3.6, with NLTK 3.0, on Mac OS X 10.7.5:</p>

<p><a href="https://i.stack.imgur.com/f57Hf.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/f57Hf.png" alt="enter image description here"></a></p>

<p>Changing the index in the NLTK downloader (suggested <a href="https://stackoverflow.com/questions/27750608/error-installing-nltk-supporting-packages-nltk-download">here</a>) allows the downloader to show all of NLTK's files, but when one tries to download all, one gets another SSL error (see bottom of photo):</p>

<p><a href="https://i.stack.imgur.com/KfJ0Y.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/KfJ0Y.png" alt="enter image description here"></a></p>