无法将IHaskel内核安装到Jupyter中：“无法解析版本号” [英] Unable to install IHaskel kernel into Jupyter: "could not parse version number"

问题描述

我最近完成了Haskell的安装说明，并已到达最后一步我在哪里运行

I've recently completed the installation instructions for Haskell, and have reached the final step where I run

ihaskell install

将IHaskell内核安装到Jupyter中。但是此时我卡住了，错误

to install the IHaskell kernel into Jupyter. However at this point I'm stuck, with the error

Detected IPython, but could not parse version number.
ihaskell: 
Ran commands: 
which ipython
/usr/local/bin/ipython --version
which /usr/local/bin/ipython

Exception: ExitFailure 1

这没有任何意义，因为当我自己运行这些命令时，我得到一个有效（和必需）的版本号：

which makes no sense, since when I run those commands myself, I get a valid (and required) version number:

$ which ipython
/usr/local/bin/ipython

$ /usr/local/bin/ipython --version
4.0.0

$ which /usr/local/bin/ipython
/usr/local/bin/ipython

如何继续将IHaskell内核安装到Jupyter？

How do I proceed to install the IHaskell kernel into Jupyter?

推荐答案

这是一个（很快就会解决） IHaskell当前版本的限制，它只支持IPhython 3.0。

This is a (soon to be addressed) limitation of the current version of IHaskell, which only supports IPhython 3.0.

退回3.0

pip uninstall ipython
pip uninstall jupyter_core
pip install ipython[notebook]==3.0

将解决问题，直到更新IHaskell，此时它将是安全的使用

will resolve the problem until IHaskell is updated, at which point it will be safe to restore the current version of IPython with

pip install ipython[notebook] --upgrade

请注意，退回到3.0会导致视图出现明显差异，但设置文件的预期位置会发生变化。

Note that stepping back to 3.0 will result in view visible differences, though the expected location of settings files will change.

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