[BUG] pythonplot backend not working: UndefVarError: pyisnone not defined

[BoundaryValueProblems]

Details

The pythonplot backend was working until recently, but somehow, with Plots.jl v1.40.2, I got the following error and it's not working regardless of the platforms (MacOS, Windows). On the other hand, the gr and the plotlyjs backends are working as before. Also, the standalone PythonPlot.jl (without Plots.jl) works without any problems.

Backends

This bug occurs on a very simple plotting function.

julia> pythonplot()
Plots.PythonPlotBackend()

julia> plot(rand(10))
Error showing value of type Plots.Plot{Plots.PythonPlotBackend}:
ERROR: UndefVarError: `pyisnone` not defined
Stacktrace:
  [1] getproperty
    @ ./Base.jl:31 [inlined]
  [2] _py_bbox(obj::PythonCall.Core.Py)
    @ Plots ~/.julia/packages/Plots/a3u1v/src/backends/pythonplot.jl:219
  [3] _update_min_padding!(sp::Plots.Subplot{Plots.PythonPlotBackend})
    @ Plots ~/.julia/packages/Plots/a3u1v/src/backends/pythonplot.jl:1253
  [4] iterate
    @ ./generator.jl:47 [inlined]
  [5] _collect(c::Matrix{…}, itr::Base.Generator{…}, ::Base.EltypeUnknown, isz::Base.HasShape{…})
    @ Base ./array.jl:854
  [6] collect_similar
    @ ./array.jl:763 [inlined]
  [7] map
    @ ./abstractarray.jl:3285 [inlined]
  [8] _update_min_padding!(layout::Plots.GridLayout)
    @ Plots ~/.julia/packages/Plots/a3u1v/src/layouts.jl:277
  [9] prepare_output(plt::Plots.Plot{Plots.PythonPlotBackend})
    @ Plots ~/.julia/packages/Plots/a3u1v/src/plot.jl:244
 [10] display(::Plots.PlotsDisplay, plt::Plots.Plot{Plots.PythonPlotBackend})
    @ Plots ~/.julia/packages/Plots/a3u1v/src/output.jl:168
 [11] display(x::Any)
    @ Base.Multimedia ./multimedia.jl:340
 [12] #invokelatest#2
    @ ./essentials.jl:892 [inlined]
 [13] invokelatest
    @ ./essentials.jl:889 [inlined]
 [14] print_response(errio::IO, response::Any, show_value::Bool, have_color::Bool, specialdisplay::Union{…})
    @ REPL ~/.julia/juliaup/julia-1.10.2+0.x64.apple.darwin14/share/julia/stdlib/v1.10/REPL/src/REPL.jl:315
 [15] (::REPL.var"#57#58"{REPL.LineEditREPL, Pair{Any, Bool}, Bool, Bool})(io::Any)
    @ REPL ~/.julia/juliaup/julia-1.10.2+0.x64.apple.darwin14/share/julia/stdlib/v1.10/REPL/src/REPL.jl:284
 [16] with_repl_linfo(f::Any, repl::REPL.LineEditREPL)
    @ REPL ~/.julia/juliaup/julia-1.10.2+0.x64.apple.darwin14/share/julia/stdlib/v1.10/REPL/src/REPL.jl:569
 [17] print_response(repl::REPL.AbstractREPL, response::Any, show_value::Bool, have_color::Bool)
    @ REPL ~/.julia/juliaup/julia-1.10.2+0.x64.apple.darwin14/share/julia/stdlib/v1.10/REPL/src/REPL.jl:282
 [18] (::REPL.var"#do_respond#80"{…})(s::REPL.LineEdit.MIState, buf::Any, ok::Bool)
    @ REPL ~/.julia/juliaup/julia-1.10.2+0.x64.apple.darwin14/share/julia/stdlib/v1.10/REPL/src/REPL.jl:911
 [19] #invokelatest#2
    @ ./essentials.jl:892 [inlined]
 [20] invokelatest
    @ ./essentials.jl:889 [inlined]
 [21] run_interface(terminal::REPL.Terminals.TextTerminal, m::REPL.LineEdit.ModalInterface, s::REPL.LineEdit.MIState)
    @ REPL.LineEdit ~/.julia/juliaup/julia-1.10.2+0.x64.apple.darwin14/share/julia/stdlib/v1.10/REPL/src/LineEdit.jl:2656
 [22] run_frontend(repl::REPL.LineEditREPL, backend::REPL.REPLBackendRef)
    @ REPL ~/.julia/juliaup/julia-1.10.2+0.x64.apple.darwin14/share/julia/stdlib/v1.10/REPL/src/REPL.jl:1312
 [23] (::REPL.var"#62#68"{REPL.LineEditREPL, REPL.REPLBackendRef})()
    @ REPL ~/.julia/juliaup/julia-1.10.2+0.x64.apple.darwin14/share/julia/stdlib/v1.10/REPL/src/REPL.jl:386
Some type information was truncated. Use `show(err)` to see complete types.

Backend	yes	no	untested
gr (default)	yes
pythonplot		no
plotlyjs	yes
pgfplotsx			x
unicodeplots			x
inspectdr			x
gaston			x

Versions

Plots.jl version: v1.40.2
Backend version (]st -m <backend(s)>): PythonPlot v1.0.3
Output of versioninfo(): Julia Version 1.10.2
Commit bd47eca2c8a (2024-03-01 10:14 UTC)
Build Info:
Official https://julialang.org/ release
Platform Info:
OS: macOS (x86_64-apple-darwin22.4.0)
CPU: 12 × Intel(R) Core(TM) i7-8700 CPU @ 3.20GHz
WORD_SIZE: 64
LIBM: libopenlibm
LLVM: libLLVM-15.0.7 (ORCJIT, skylake)
Threads: 1 default, 0 interactive, 1 GC (on 12 virtual cores)
Environment:
JULIA_PKG_USE_CLI_GIT = true
LD_LIBRARY_PATH = /Users/xxx/lib:/usr/local/lib:/usr/lib:

[BeastyBlacksmith]

The reason here is that PythonCall moved pyisnone into a submodule called Core. Probably should use a proper dependency on PythonCall and set compat bounds accordingly.

cc: @isentropic

[BoundaryValueProblems]

Thanks a lot, @BeastyBlacksmith! When I replaced the line 219 of pythonplot.jl

PythonCall.pyisnone(obj) && return _py_bbox(nothing)

by

PythonCall.Core.pyisnone(obj) && return _py_bbox(nothing)

it started working! Could you add this for the next update of the master branch? Creating a full pull request for just this change is a bit of overkill. Thanks a lot!!