code: def __new__(cls, *args, **kwargs):
      idx = kwargs.pop("idx")
  
      obj = cls._STRATS[idx](*args, **kwargs)
      return obj
  
file_path: backtrader/samples/strategy-selection/strategy-selection.py
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import argparse
  import backtrader
label_desc: Use image node_id 1 for calling the StFetcher obj's underlying member method code with example usage: obj.__new__(cls) and returns: obj