code: def _fix_paths(self, options):
          
          for k in ('template_path', 'static_path'):
              if k in options:
                  v = options.pop(k)
                  if v is None:
                      continue
                  if not os.path.isabs(v):
                      v = os.path.abspath(
                          os.path.join(self.root_path, v))
                      app_log.debug('Fix %s to be absolute: %s' % (k, v))
                  options[k] = v
docs: fix `static_path` and `template_path` to be absolute
          path according to self.root_path so that PWD can be ignoreed.