Qt Code: 
  1. (self.ui.qtreeview.header()).setResizeMode(3)
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That works great ! But now I have another 2 problems. The first one is that I can't hide one of the columns, I tried with this:
Qt Code: 
  1. index = (self.ui.qtreeview.header()).visualIndex(4)
  2.         (self.ui.qtreeview.header()).setSectionHidden(index, True)
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The second problem is that I have some qstandarditems that have really long text, and when the text-column is expanded according to the size of the text, the QTreeView will become... scrollable (horizontally). How can I prevent that?