class_docstr: Extension of regular Value observer to add leveraged view
class_docstr_tok: ["Extension","of","regular","Value","observer","to","add","leveraged","view"]
code: def next(self):
      super(ValueUnlever, self).next()
      if self.p.lever:
          self.lines.value_lever[0] = self._owner.broker._valuelever
  
      if len(self) == 1:
          self.lines.asset[0] = self.p.assetstart
      else:
          change = self.data[0] / self.data[-1]
          self.lines.asset[0] = change * self.lines.asset[-1]
  
file_path: backtrader/samples/btfd/btfd.py
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import argparse
  import datetime
  import backtrader
label_desc: Use image node_id 1 for calling the ValueUnlever obj's underlying member method code with example usage: obj.next() without return types