109.md

【backtrader 源码解析 31】version.py 和 errors.py 源码解析(枯燥，仅供参考)

原文：https://yunjinqi.blog.csdn.net/article/details/124567591

这两个文件用处都不大，而且源码写的都比较简单，一看就懂。

version.py 提供 backtrader 的版本号

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

# backtrader 版本号
__version__ = '1.9.76.123'

# backtrader 版本号，元组格式
__btversion__ = tuple(int(x) for x in __version__.split('.')) 

errors.py 定义了一些错误类型

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

# 从 from error import * 的时候，只导入下面两个类 BacktraderError 和 StrategySkipError
__all__ = ['BacktraderError', 'StrategySkipError']

# BacktraderError 类
class BacktraderError(Exception):
    '''Base exception for all other exceptions'''
    pass

# StrategySkipError，只有这个类在 cerebro 中用到了
class StrategySkipError(BacktraderError):
    '''Requests the platform to skip this strategy for backtesting. To be
    raised during the initialization (``__init__``) phase of the instance'''
    pass

# ModuleImportError 类
class ModuleImportError(BacktraderError):
    '''Raised if a class requests a module to be present to work and it cannot
    be imported'''
    def __init__(self, message, *args):
        super(ModuleImportError, self).__init__(message)
        self.args = args

# FromModuleImportError 类
class FromModuleImportError(ModuleImportError):
    '''Raised if a class requests a module to be present to work and it cannot
    be imported'''
    def __init__(self, message, *args):
        super(FromModuleImportError, self).__init__(message, *args)