title: Best way to store data temporarily?
body: <p>I'm building a sort of monitoring tool in Python where I want to keep certain stats for a short period of time. I only want to keep a maximum of, say, 30 entries for a stat, and for the older entries to be overwritten as new ones come in. This way, only the 30 most recent entries are kept. What sort of file should I use for this (I'll have multiple different stats all of which I would like to only keep their recent history. The stats are updated at regular intervals ~15 seconds). </p>
  
  <p>I want this to be in a file as the data will be handled in another program. </p>