title: 0.000226*1000 not give 0.226 but 0.22599999999999998
body: <p>Why isn't the result of the following code 0.226? </p>
  
  <pre><code>In[6]: 0.000226*1000
  Out[6]: 0.22599999999999998
  </code></pre>
  
  <p>I use python 3.6.</p>