code: def to_python(cls, value, **kwargs):
          
          if not value:
              return ''
          try:
              return str(value)
          except:
              pass
          try:
              return value.encode('utf-8')
          except:
              pass
          raise cls.exception("Cannot deserialize value {0} tostring".format(value))
docs: String deserialisation just return the value as a string