英文:
Why is fsspec an optional dependency, when you need it to read a csv file with pandas?
问题
我经常使用pandas包，所以我在我的主要工作计算机上将其全局可用。这是相当久以前的事情，所以我无法回想起以前安装时的所有细节，但我不记得需要额外安装可选依赖项fsspec。
最近，我尝试在家里完成一些工作，不得不在另一台计算机上再次运行pip install pandas，我很惊讶地发现从<s>local</s> csv文件中读取失败，因为fsspec被视为可选依赖项。
为什么将它设置为可选依赖项而不自动安装为必需依赖项呢？
编辑: 原来我不小心在路径中多输入了一个斜杠，将c://写成了c:/。我猜测多余的斜杠可能设置了一个标志，以将路径的其余部分识别为远程文件？
英文:
I use the pandas package quite a bit, so I've made it globally available on my main work computer. I did this quite awhile ago, so I can't recall all the details to what I did when installing in the past, but I don't remember having to take an extra step in installing the optional dependency, fsspec.
I recently tried to get a little work done at home, and I had to pip install pandas again on another computer, and I was surprised to see that reading from a <s>local</s> csv file failed because fsspec was considered an optional dependency.
What's the reasoning behind making it optional instead of automatically installing it as a required dependency?
edit: It turns out I just fat-fingered the path and put c:// instead of c:/. I'm assuming the extra slash set a flag to recognize the rest of the path as a remote file?
答案1
得分: 2
如文档中所提到的：
所有非本地文件或HTTP(s)的URL都由fsspec处理，如果已安装，以及其各种文件系统实现（包括Amazon S3，Google Cloud，SSH，FTP，webHDFS...）。
至于为什么是可选的 - 这是开发者的决定，但我会预期，如果不使用远程文件，它不是必需的，所以他们决定将其作为可选项。
英文:
As mentioned in the docs:
> All URLs which are not local files or HTTP(s) are handled by fsspec,
> if installed, and its various filesystem implementations (including
> Amazon S3, Google Cloud, SSH, FTP, webHDFS…).
As to why is optional - it's developer's decision, but I would expect that as it is not required if you don't work with remote files, you don't need it, so they decided t leave it optional.
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