PyPlot.jl does not work with matplotlib 2.0?

[giordano]

Since a few weeks ago, I cannot use PyPlot anymore. Any plotting command results in

ERROR: PyCall.PyError(":PyObject_Call",PyCall.PyObject(Ptr{PyCall.PyObject_struct} @0x00007f0c8ebb2040),PyCall.PyObject(Ptr{PyCall.PyObject_struct} @0x00007f0c71f83fc8),PyCall.PyObject(Ptr{PyCall.PyObject_struct} @0x00007f0c71f24098))
Stacktrace:
 [1] pyerr_check at /home/mose/.julia/v0.6/PyCall/src/exception.jl:56 [inlined]
 [2] pyerr_check at /home/mose/.julia/v0.6/PyCall/src/exception.jl:61 [inlined]
 [3] macro expansion at /home/mose/.julia/v0.6/PyCall/src/exception.jl:79 [inlined]
 [4] #_pycall#66(::Array{Any,1}, ::Function, ::PyCall.PyObject, ::Array{Float64,1}, ::Vararg{Array{Float64,1},N}) at /home/mose/.julia/v0.6/PyCall/src/PyCall.jl:546
 [5] _pycall(::PyCall.PyObject, ::Array{Float64,1}, ::Vararg{Array{Float64,1},N}) at /home/mose/.julia/v0.6/PyCall/src/PyCall.jl:534
 [6] #pycall#70(::Array{Any,1}, ::Function, ::PyCall.PyObject, ::Type{PyCall.PyAny}, ::Array{Float64,1}, ::Vararg{Array{Float64,1},N}) at /home/mose/.julia/v0.6/PyCall/src/PyCall.jl:568
 [7] pycall(::PyCall.PyObject, ::Type{PyCall.PyAny}, ::Array{Float64,1}, ::Vararg{Array{Float64,1},N}) at /home/mose/.julia/v0.6/PyCall/src/PyCall.jl:568
 [8] #plot#85(::Array{Any,1}, ::Function, ::Array{Float64,1}, ::Vararg{Array{Float64,1},N}) at /home/mose/.julia/v0.6/PyPlot/src/PyPlot.jl:399
 [9] plot(::Array{Float64,1}, ::Vararg{Array{Float64,1},N}) at /home/mose/.julia/v0.6/PyPlot/src/PyPlot.jl:396

I noticed that my matplotlib version is 2.0.0rc2 (installed from Debian testing's repositories), maybe PyPlot is currently incompatible with this version of the plotting library? matplotlib from python seems to work (I'm not a python user, just tested a simple example plot).

Update: this happens only in Julia 0.6, in Julia 0.5 works flawless. May be related to #266 (I can precompile the package, but probably get the same error reported at #266 (comment)).

[stevengj]

I'm using

julia> PyPlot.matplotlib["__version__"]
PyObject '2.0.0'

on MacOS via Conda, and it works fine for me. Can you check whether things work with the latest PyPlot and PyCall?

[giordano]

Currently I cannot precompile PyPlot due to ColorTypes being broken. How can you load the package?

[stevengj]

I'm maybe not using the latest ColorTypes? Let me check...nope, works fine after Pkg.update.

[stevengj]

Oh, sorry, I'm on Julia 0.5. I haven't been testing in 0.6 recently. In any case, if it's only in 0.6, then it's not a matplotlib 2.0 issue; closing in favor of #266.

[giordano]

Note that the original problem of #266 is actually fixed (and was a problem in PyCall, rather than in PyPlot), then the OP posted another unrelated issue in the same ticket. The current problem doesn't have anything to do with the title of #266 now.

[stevengj]

At this point, there is no point in trying to get it to work on 0.6 until the dependencies like ColorTypes work.

[giordano]

Now that ColorTypes works on master, PyPlot works as well for me.