【backtrader源码解析48】analyzer中pyfolio(positions,leverage,transactions)等几个相关的文件解读(枯燥，仅供参考)

analyzers中positions,leverage,transcations和pyfolio几个文件的解读

positions.py

from __future__ import (absolute_import, division, print_function,
                        unicode_literals)


import backtrader as bt

# 持仓价值
class PositionsValue(bt.Analyzer):
    '''This analyzer reports the val