title: Python script to search PII
body: <p>I would like to write a script which can search for and report on Personally Identifiable Information like card numbers, etc in a file system. I would like to find it in txt as well as xls word and PDF files.</p>
  
  <p>Any starting tips or which lib to use are welcome.</p>
  
  <p>I'd also like advice on an efficient way to scan large files for patterns like credit cards etc.</p>