code: def next(self):
      txt = ["{:4d}".format(len(self))]
      txt.append("{}".format(self.datetime.date()))
      txt.append("{:.2f}".format(self.psar[0]))
      print(",".join(txt))
  
file_path: backtrader/samples/psar/psar.py
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import argparse
  import datetime
  import backtrader
label_desc: Use image node_id 2 for calling the St obj's underlying member method code with example usage: obj.next() without return types