How to use the nexusformat.nexus.NXnote function in nexusformat

parameters[p.name] = NXfield(p.value, error=p.stderr, 
                                             initial_value=p.init_value,
                                             min=str(p.min), max=str(p.max))
            group[f.name].insert(parameters)
        if self.fit is not None:
            group['program'] = 'lmfit'
            group['version'] = lmfit.__version__
            group['title'] = 'Fit Results'
            group['fit'] = self.get_model()
            fit = NXparameters()
            fit.nfev = self.fit.result.nfev
            fit.chisq = self.fit.result.chisqr
            fit.redchi = self.fit.result.redchi
            fit.message = self.fit.result.message
            group['statistics'] = fit
            group.note = NXnote(self.fit.result.message,
                ('Chi^2 = %s\n' % self.fit.result.chisqr +
                 'Reduced Chi^2 = %s\n' % self.fit.result.redchi +

                 'No. of Function Evaluations = %s\n' % self.fit.result.nfev +
                 'No. of Variables = %s\n' % self.fit.result.nvarys +
                 'No. of Data Points = %s\n' % self.fit.result.ndata +
                 'No. of Degrees of Freedom = %s\n' % self.fit.result.nfree +
                 '%s' % self.fit.fit_report()))
        else:
            group['title'] = 'Fit Model'
            group['model'] = self.get_model()
        if 'w0' not in self.tree:
            self.tree['w0'] = nxload(self.mainwindow.scratch_file, 'rw')
        ind = []
        for key in self.tree['w0']:
            try: