class_docstr: Print portfolio level information relevant to this strategy
code: def __call__(self, target):
      flows = target.flows.loc[target.now]
      if flows:
          fmt_str = "{now} {name}: Price = {price:>6.2f}, Value = {value:>10,.0f}, Flows = {flows:>8,.0f}"
      else:
          fmt_str = "{now} {name}: Price = {price:>6.2f}, Value = {value:>10,.0f}"
      print(
          fmt_str.format(
              now=target.now,
              name=target.name,
              price=target.price,
              value=target.value,
              flows=flows,
          )
      )
  
imports: from copy import deepcopy
  from future.utils import iteritems
  from datetime import date
  import pandas
  import numpy
  import bt
label_desc: Use image node_id 1 for calling the DebugPortfolioLevel obj's underlying member method code with example usage: obj.__call__(target) without return types