title: Get data from every cell from a QTableView
body: <p>I need the values from a <code>QtableView</code>, but I do not know how to do that without a signal emitted from the table. </p>
  
  <p>The table takes its values from a txt-file. From the table, I want to work with the values, but without working in the table. The table is just a buffer. 
  So how can I "take" all the values from the table, just pressing a <code>QPushButton</code>, without any signal from the table itself?</p>