文件未找到/无效参数

Question

虽然我的文件夹在正确的路径上，但是函数找不到它。

我对编程比较陌生，也许有一些明显的错误?

import backtrader as bt
cerebro = bt.Cerebro()
data = bt.feeds.GenericCSVData(dataname=r'D:ProgrammeVisual Studio CodeProjekteD_Candles.csv', dtformat=2)
cerebro.adddata(data)
cerebro.run()
cerebro.plot()

所有依赖项和包已安装。

错误信息:

PS D:ProgrammeVisual Studio CodeProjekte> & C:/Users/William/AppData/Local/Microsoft/WindowsApps/python3.10.exe "d:/Programme/Visual Studio Code/Projekte/Trading/backtest.py"
Traceback (most recent call last):
File "d:ProgrammeVisual Studio CodeProjekteTradingbacktest.py", line 9, in <module>
cerebro.run()
File "C:UsersWilliamAppDataLocalPackagesPythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0LocalCachelocal-packagesPython310site-packagesbacktradercerebro.py", line 1127, in run
runstrat = self.runstrategies(iterstrat)
File "C:UsersWilliamAppDataLocalPackagesPythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0LocalCachelocal-packagesPython310site-packagesbacktradercerebro.py", line 1210, in runstrategies
data._start()
File "C:UsersWilliamAppDataLocalPackagesPythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0LocalCachelocal-packagesPython310site-packagesbacktraderfeed.py", line 203, in _start
self.start()
File "C:UsersWilliamAppDataLocalPackagesPythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0LocalCachelocal-packagesPython310site-packagesbacktraderfeedscsvgeneric.py", line 88, in start 
super(GenericCSVData, self).start()
File "C:UsersWilliamAppDataLocalPackagesPythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0LocalCachelocal-packagesPython310site-packagesbacktraderfeed.py", line 674, in start
self.f = io.open(self.p.dataname, 'r')
FileNotFoundError: [Errno 2] No such file or directory: 'D:\Programme\Visual Studio Code\Projekte\D_Candles.csv'
PS D:ProgrammeVisual Studio CodeProjekte>

我试过了:

• 只是提示文件夹名称，而不是整个路径
• 切换反斜杠，尝试//，，/，和&没有r
• 将文件夹复制到其他路径
• 不是因为单词之间有空格

我真的很感谢你的帮助。即使你只知道一个替代函数，我也可以尝试…

Answer 1

try this

r'D:ProgrammeVisual Studio CodeProjekteD_Candles.csv'

表示变量为原始字符串，将反斜杠字符视为文字字符。当字符串需要包含反斜杠时很有用，例如用于正则表达式或Windows目录路径