找不到文件/无效参数

Question

虽然我的文件夹在正确的路径，但是function找不到。

我对编程比较陌生，可能有一些明显的错误？

import backtrader as bt

cerebro = bt.Cerebro()

data = bt.feeds.GenericCSVData(dataname=r'D:\Programme\Visual Studio Code\Projekte\D_Candles.csv', dtformat=2)

cerebro.adddata(data)

cerebro.run()

cerebro.plot()

所有依赖项和包都已安装。

错误信息：

PS D:\Programme\Visual Studio Code\Projekte> & 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:\Programme\Visual Studio Code\Projekte\Trading\backtest.py", line 9, in <module>
    cerebro.run()
  File "C:\Users\William\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\backtrader\cerebro.py", line 1127, in run
    runstrat = self.runstrategies(iterstrat)
  File "C:\Users\William\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\backtrader\cerebro.py", line 1210, in runstrategies
    data._start()
  File "C:\Users\William\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\backtrader\feed.py", line 203, in _start
    self.start()
  File "C:\Users\William\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\backtrader\feeds\csvgeneric.py", line 88, in start 
    super(GenericCSVData, self).start()
  File "C:\Users\William\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\backtrader\feed.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:\Programme\Visual Studio Code\Projekte>

到目前为止我尝试了什么：

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

非常感谢你的帮助。 即使您只知道替代方案 function，我也可以尝试...

Answer 1

尝试这个

r'D:\Programme\Visual Studio Code\Projekte\D_Candles.csv'

它将变量指示为将反斜杠字符视为文字字符的原始字符串。 当字符串需要包含反斜杠时很有用，例如正则表达式或 Windows 目录路径