docs: def _update(self):
          """Reload Taskwarrior files if the mtime is newer"""
          update = False
  
          with self._lock:
              for fname in ['pending.data', 'completed.data']:
                  data_file = join(self._data_location, fname)
                  if exists(data_file):
                      mtime = getmtime(data_file)
                      if mtime > self._mtime:
                          self._mtime = mtime
                          update = True
  
              if update:
                  self._tasks = {}
                  tasklist = loads(run(['task', 'rc.verbose=nothing', 'rc.hooks=off', 'rc.data.location={self._data_location}'.format(**locals()), 'export'], stdout=PIPE).stdout.decode('utf-8'))
                  for task in tasklist:
                      project = task['project'] if 'project' in task else 'unaffiliated'
                      if project not in self._tasks:
                          self._tasks[project] = {}
                      self._tasks[project][task['uuid']] = task