human
What is a the Python code you requested given the following:
Complete the below
@requires_application('pyqt4', has=['uic'])
def test_qt_designer():

    ''''Embed Canvas via Qt Designer'
    '''
assistant
#Here is the Python code you requested.
    from PyQt4 import QtGui, uic
    app = QtGui.QApplication.instance()
    if (app is None):
        app = QtGui.QApplication([])
    fname = op.join(op.dirname(__file__), 'qt-designer.ui')
    with warnings.catch_warnings(record=True):
        (WindowTemplate, TemplateBaseClass) = uic.loadUiType(fname)
    class MainWindow(TemplateBaseClass, ):
        def __init__(self):
            TemplateBaseClass.__init__(self)
            self.ui = WindowTemplate()
            self.ui.setupUi(self)
    win = MainWindow()
    try:
        canvas = win.ui.canvas
        canvas.central_widget.add_view()
        win.show()
        app.processEvents()
    finally:
        win.close()
    return win