'ascii' codec can't encode character u'\xba' in position 3: ordinal not in range(128)

[letni]

Lo he resuelto así:

Código:

def __unicode__(self):
          return "{}; {} {}".format(self.identifier,
                                                   self.Timestamp.encode('ascii', 'ignore').decode('ascii'),
                                                   self.Username.encode('ascii', 'ignore').decode('ascii'))

Saludos.