title: How to change the field separator of a file using Python?
body: <p>I'm new to Python from the R world, and I'm working on big text files, structured in data columns (this is LiDaR data, so generally 60 million + records).</p>
  
  <p>Is it possible to change the field separator (eg from tab-delimited to comma-delimited) of such a big file without having to read the file and do a <code>for</code> loop on the lines?</p>