title: How can I filter lines on load in Pandas read_csv function?
body: <p>How can I filter which lines of a CSV to be loaded into memory using pandas?  This seems like an option that one should find in <code>read_csv</code>.  Am I missing something?</p>
  
  <p>Example: we've a CSV with a timestamp column and we'd like to load just the lines that with a timestamp greater than a given constant.</p>