运行时报错,
File "C:\ProgramData\Anaconda3\lib\site-packages\vnpy\app\cta_strategy\backtesting.py", line 225, in load_data
total_delta = self.end - self.start
TypeError: unsupported operand type(s) for -: 'str' and 'str'
指向如下代码,文件backtesting.py line:225,下边的最后一行
# Load 30 days of data each time and allow for progress update
progress_delta = timedelta(days=30)
total_delta = self.end - self.start
跟python的小版本有关系?