title: How to sort or filter a qtable with pyqt
body: <p>I have populated a qtable inside a qtwidget with 4 columns as
  project, person,  times, color
  now i want to be able to filter base on the columns options.  example  how can i do the get to show  just the rows of one particular project, and later on  of that particular project just the color red,  in that way i can know who was on that project and how much time it took for that person.</p>
  
  <p>Thanks.</p>