【backtrader源码解析47】analyzer中annualreturn、timereturn、returns等几个计算收益率的文件解读(枯燥，仅供参考)

annualreturn.py

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

from collections import OrderedDict

from backtrader.utils.py3 import range
from backtrader.utils.date import num2date
from