code: def __init__(self):
      sma1, sma2 = bt.ind.SMA(period=10), bt.ind.SMA(period=30)
      crossover = bt.ind.CrossOver(sma1, sma2)
      self.signal_add(bt.SIGNAL_LONG, crossover)
  
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 to create a new St0 object from inherited base classes: bt with example: obj = St0()