code: def __getitem__(self, key):
      return self._atlas[key]
  
file_path: vispy/vispy/visuals/line/dash_atlas.py
imports: from functools import lru_cache
  import numpy
label_desc: Use image node_id 2 for calling the DashAtlas obj's underlying member method code with example usage: obj.__getitem__(key) and returns: self