the ENV["PYTHON"]="path/to/python.exe" not work for python3.12.0

[nil-is-lin]

I have upgrade the python to python 3.12.0. However, it can't find the package "matplotlib" install by pip, which works well for the old version of python(3.11.3). It should be the problem for new python version, I guess.

there is no error in the process "set ENV, build PyCall". It just cant change to the system-wide python.

[stevengj]

Can you show exactly what you did?

You should

1. Start a fresh Julia session
2. Set your ENV["PYTHON"] appropriately
3. run using PyCall and check that PyCall.python is the desired python
4. try pyimport("matplotlib") and see whether it succeeds

[nil-is-lin]

I believe the following screenshot can illustrate my problem.

julia> using PyCall

julia> PyCall.python "C:\Users\nil_l\.julia\conda\3\x86_64\python.exe"

julia> ENV["PYTHON"] "D:\Python\Python312\python.exe"

(@v1.9) pkg> build PyCall Building Conda ─→ C:\Users\nil_l\.julia\scratchspaces\44cfe95a-1eb2-52ea-b672-e2afdf69b78f\8c86e48c0db1564a1d49548d3515ced5d604c408\build.log Building PyCall → C:\Users\nil_l\.julia\scratchspaces\44cfe95a-1eb2-52ea-b672-e2afdf69b78f\43d304ac6f0354755f1d60730ece8c499980f7ba\build.log

julia> PyCall.python "C:\Users\nil_l\.julia\conda\3\x86_64\python.exe"

[stevengj]

You need to start a new session after building PyCall, if PyCall has already been loaded. That's why step 1 in my comment above was "Start a fresh Julia session".

It would also be helpful to see the contents of the build.log file for PyCall.

[nil-is-lin]

You are right. I used the wrong process, every time I used PyCall to see if it changed, and then built again, so it didn't work.