title: pyqt - Change row~cell color in TableView
body: <p>I have a QTableView with three columns
  The second column is about numbers, there are only three types: 1, -1 and 0.
  I want to have different colors for this three "types" of numbers (1,-1,0), coloring their rows with different colors. How can i do it?</p>
  
  <pre><code> self.tableView = QTableView(self.tabSentimento)
   self.tableView.setGeometry(QRect(550,10,510,700))
   self.tableView.setObjectName(_fromUtf8("TabelaSentimento"))
   self.tableView.setModel(self.model)
   self.tableView.horizontalHeader().setStretchLastSection(True)
  </code></pre>
  
  <p>obs: I used <code>horizontalheader().setStrechLastSection(True)</code> because I opened an existing csv file (using a button) into my tableview.</p>