Method get

lantz/feat.py:206–246

(self, instance, owner=None, key=MISSING)

        return value

    def get(self, instance, owner=None, key=MISSING):
        if instance is None:
            return self

        name = self.name + ('' if key is MISSING else '[{!r}]'.format(key))
        if self.fget is None or self.fget is MISSING:
            raise AttributeError('{} is a write-only feature'.format(name))

        current = self.get_cache(instance, key)
        if self.read_once and current is not MISSING:
            return current

        # This part calls to the underlying get function wrapping
        # and timing, caching, logging and error handling
        with instance._lock:
            instance.log_info('Getting {}', name)

            try:
                tic = time.time()
                if key is MISSING:
                    value = self.fget(instance)
                else:
                    value = self.fget(instance, key)
            except Exception as e:
                instance.log_error('While getting {}: {}', name, e)
                raise e

            instance.timing.add('get_' + name, time.time() - tic)

            instance.log_debug('(raw) Got {} for {}', value, name)
            try:
                value = self.post_get(value, instance, key)
            except Exception as e:
                instance.log_error('While post-processing {} for {}: {}', value, name, e)
                raise e

            instance.log_info('Got {} for {}', value, name, lantz_feat=(name, str(value)))

            self.set_cache(instance, value, key)

        return value

    def set(self, instance, value, force=False, key=MISSING):
        name = self.name + ('' if key is MISSING else '[{!r}]'.format(key))