PyCall pynitiliaze error called by PyPlot on WIndows about pyplot.jl HOT 6 CLOSED

The no module named site message usually means that some Python path is getting set incorrectly. Could be related to JuliaPy/PyCall.jl#57 ... cc @lucasb-eyer

from pyplot.jl.

Thanks for your quick reply. The problem is indeed in PyCall.jl. Reversing the recent commit and reinstalling

push!(libpaths, exec_prefix)
    if !haskey(ENV, "PYTHONHOME")
        ENV["PYTHONHOME"] = exec_prefix
    end

the issue disappeared and got my plots back

from pyplot.jl.

So the problem is using prefix * ":" * exec_prefix instead of exec_prefix for PYTHONHOME? Maybe Windows wants ; as the path separator?

What if you re-instate the patch but use

ENV["PYTHONHOME"] = prefix * (@windows? ";" : ":") * exec_prefix

from pyplot.jl.

That is very possible. I thought about it when writing the pull-request, but since the PYTHONHOME documentation explicitly gave only : as an example while the very next documented variable (PYTHONPATH) goes lengths about explaining that one should use os.pathsep, I assumed PYTHONHOME to be colon-only. I didn't have a windows installation handy to test.

Another possibility is that one shouldn't set it to both prefix and exec_prefix on windows, but that's less likely.

from pyplot.jl.

Believe that it is the second possibility, since with ENV["PYTHONHOME"] = prefix * (@windows? ";" : ":") * exec_prefix one gets

PyError (PyImport_ImportModule) <type 'exceptions.ImportError'>
ImportError('No module named matplotlib',)

at C:\Users\Tony\.julia\PyPlot\src\PyPlot.jl:32
at In[1]:2
 in pyerr_check at C:\Users\Tony\.julia\PyCall\src\exception.jl:58

and Python docs state that "prefix and exec-prefix stand for the directories that Python is installed to... They are always the same under Windows"

The following

ENV["PYTHONHOME"] =  (@windows? exec_prefix : (prefix * ":" * exec_prefix ))

works fine on Windows

from pyplot.jl.

Should be fixed in the latest PyCall.

from pyplot.jl.