class_docstr: Base container class.
class_docstr_tok: ["Base","container","class","."]
docstr: Retrieves item by the specified key.
docstr_tok: ["Retrieves","item","by","the","specified","key","."]
code: def __getitem__(self, key):
      """Retrieves item by the specified key."""
      return self._values[key]
  
imports: import collections
  import sys
label_desc: Use image node_id 2 for calling the BaseContainer obj's underlying member method code with example usage: obj.__getitem__(key) and returns: self