How to use the pyedflib._extensions._pyedflib.write_annotation_utf8 function in pyEDFlib

def writeAnnotation(self, onset_in_seconds, duration_in_seconds, description, str_format='utf-8'):
        """
        Writes an annotation/event to the file
        """
        if str_format == 'utf-8':
            if duration_in_seconds >= 0:
                return write_annotation_utf8(self.handle, np.round(onset_in_seconds*10000).astype(int), np.round(duration_in_seconds*10000).astype(int), du(description))
            else:
                return write_annotation_utf8(self.handle, np.round(onset_in_seconds*10000).astype(int), -1, du(description))
        else:
            if duration_in_seconds >= 0:
                return write_annotation_latin1(self.handle, np.round(onset_in_seconds*10000).astype(int), np.round(duration_in_seconds*10000).astype(int), u(description).encode('latin1'))
            else:
                return write_annotation_latin1(self.handle, np.round(onset_in_seconds*10000).astype(int), -1, u(description).encode('latin1'))

def writeAnnotation(self, onset_in_seconds, duration_in_seconds, description, str_format='utf-8'):
        """
        Writes an annotation/event to the file
        """
        if str_format == 'utf-8':
            if duration_in_seconds >= 0:
                return write_annotation_utf8(self.handle, np.round(onset_in_seconds*10000).astype(int), np.round(duration_in_seconds*10000).astype(int), du(description))
            else:
                return write_annotation_utf8(self.handle, np.round(onset_in_seconds*10000).astype(int), -1, du(description))
        else:
            if duration_in_seconds >= 0:
                return write_annotation_latin1(self.handle, np.round(onset_in_seconds*10000).astype(int), np.round(duration_in_seconds*10000).astype(int), u(description).encode('latin1'))
            else:
                return write_annotation_latin1(self.handle, np.round(onset_in_seconds*10000).astype(int), -1, u(description).encode('latin1'))