title: How to load existing db file to memory in Python sqlite3?
body: <p>I have an existing <code>sqlite3</code> db file, on which I need to make some extensive calculations. Doing the calculations from the file is painfully slow, and as the file is not large (~<code>10 MB</code>), so there should be no problem to load it into memory.</p>
  
  <p>Is there a Pythonic way to load the existing file into memory in order to speed up the calculations?</p>