WinPython + JupyterLab + Julia 1.5.2 + Julia 1.6.5

General Usage
1

Hello,

Since nearly one year, I have been using WinPython + JupyterLab + Julia 1.5.2
I can’t remember how I managed to configure that at that time.
Using JupyterLab that came with WinPython, I can create Python or Julia 1.5.2 notebooks.
I can use both languages side-by-side, which is very convenient.

Today, I installed Julia 1.6.5 and I added the IJulia package from the REPL.
I expected to see a configuration WinPython + JupyterLab + Julia 1.5.2 + Julia 1.6.5.
But nothing has changed! Julia 1.6.5 doesn’t appear in JupyterLab.
I can use Julia 1.6.5 by lauching JupyterLab from the REPL, but then my Python environment is gone.

Could you help me ?
I would like to use my existing Python environment and the Julia 1.6.5 together

Thanks

Michel

2

Can you try

using Pkg
Pkg.build("IJulia")

At least in normal Jupyter this adds the new Julia version as kernel.

3

Thanks!

I did that and then

using IJulia
jupyterlab()

This launches a JupyterLab instance from the Julia 1.6.5 folder.
The nice thing is that both versions of Julia are available.
Unfortunately, I have no acces to WinPython then.
Instead it takes Python from ...\.julia\conda\3 which is fresh new.
I would prefer to use my former WinPython installation with all my stuff!

The JupyterLab packaged with WinPython makes Julia 1.5.2 avaliable.
I can’t remember how I did the install one year ago.

Any idea?
How does a JupyterLab instance know where all the kernels are?

Thanks

Michel

4

In the documentation is something mentioned
https://julialang.github.io/IJulia.jl/stable/manual/installation/

Does that help somehow?

5

Thanks!

Just had a look at Installation · IJulia
I notied a remark about ENV["JUPYTER"], and was quite exceited!
I then did this:

ENV["JUPYTER"] = "...\\WPy64-3940"
using Pkg
Pkg.rm("IJulia")
Pkg.add("IJulia")
Pkg.build("IJulia")

Unfortunately, it didn’t change anything.
But I have the feeling I come close to the solution !
I go to bed, and hopefully I solve that tomorrow !!!

Any suggestion again welcome!

Thanks

Michel

1 Like
6

Woke up early today!
But not yet a solution!
Using

ENV["JUPYTER"] = "...\\WPy64-3940\\Jupyter Lab.exe"

does not solve the problem …

In the WinPython distribution, I observe there is a notebook called installing_julia_and_ijulia.ipynb.
But it looks like it deals with a very olde version of Julia.
And this script is rather obscure to me, I am not ready to go futher!

Any suggestion still welcome!

Michel

7

This seems to say similar things to what you tried, but maybe something useful?

8

Thanks!
Interresting thread.
Comes close, but no clue for my issue.
Michel

9

I got it !!!
Thanks to all of you !

I found out that the usual IJulia installation from the Julia REPL
creates a kernel.json file in a folder like :
C:\Users\mytoys\AppData\Roaming\jupyter\kernels\julia-1.6.
This where JupyterLab will look for kernels when it is started from the Julia REPL.

But the JupyterLab included in WinPython won’t look there.
Instead, it looks in a folder like :
C:\Users\mytoys\Desktop\WPy64-3940\python-3.9.4.amd64\share\jupyter\kernels

I simply solved the problem by copying the julia-1.6 folder from the first location to the second.

And now, I am happy!

Thanks,

Michel

1 Like