parameters: (self, key)
return_statement: return self._values[key]
docstring: Retrieves item by the specified key.
docstring_summary: Retrieves item by the specified key.
docstring_tokens: Retrieves item by the specified key .
function: def __getitem__(self, key):
      """Retrieves item by the specified key."""
      return self._values[key]
function_tokens: def __getitem__ ( self , key ) : return self . _values [ key ]