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holzschu / Carnets

Carnets is a stand-alone Jupyter notebook server and client. Edit your notebooks on the go, even where there is no network.
https://holzschu.github.io/Carnets_Jupyter/
BSD 3-Clause "New" or "Revised" License
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%pip install backports.lzma || py7zr can’t be installed #296

Open bebopimpromptu opened 1 year ago

bebopimpromptu commented 1 year ago

When trying to install, starts but it says “Failed to build backports.lzma” and other case “Preparing metadata (pyproject.toml): finished with status 'error'”. After the error kernel starts to works odd, every time when re starting the kernel died and then starts again.

holzschu commented 1 year ago

It's a bit more difficult to debug without the full error message, but backports.lzma tries to compile the lzma library and the xz command. Both of these require a compiler (to compile C source code and libraries), which does not exist on iOS. Hence they cannot be installed (only pure Python packages can be installed). Same with py7zr. You can use a-Shell to have the xz utility.

That being said, lzma is supposed to be included with Python versions after 3.3, so backports.lzma should not be necessary. I'll investigate.

jakirkham commented 1 year ago

If I had to guess, there's a pyproject.toml in some project, which is always installing backports.lzma even though it is only needed on Python 2 (and some fairly old Python 3.x versions). Ideally the pyproject.toml would conditionally (like 'backports.lzma; python_version<"3.3"'). Maybe worth asking that project if they would be open to this change?