PyQt window closes after launch

Question

I\'m trying to use a QPushButton to call a function that opens a new instance of QWebView. Works but as soon as the window opens it closes again. I\'ve read this - PyQt win

Answer 1

To keep a reference to a QObject, you can either keep the variable in scope, or add it as the child of another QObject which variable already stays in scope.

And for QWidget, the parent should also be a QWidget, so, in your case, you'd want to make w as the parent of all your QMainWindows.

def web1(parent):
    ...
    class Browser(QtGui.QMainWindow): # "Browser" window
        def __init__(self, parent):
            QtGui.QMainWindow.__init__(self, parent)
            ...

def main():
    ...
    w.__button.clicked.connect(lambda: web1(w))

This also avoid maintaining manually a list of opened windows, since the object hierarchy can do that for you.

PS: The child windows are shown as toplevel windows and not inside the w window, because QMainWindow (and QDialog) has the Qt::Window flag set by default.