julia> newton(:(z^3-1),n=800,ϵ=0.1,N=25,iter=true,cmap="jet") |> fatou |> plot
  0.137883 seconds (55.66 k allocations: 3.189 MiB, 56.83% compilation time)
ERROR: (in a Julia function called from Python)
JULIA: MethodError: no method matching iterate(::Fatou.Rectangle)
Closest candidates are:
  iterate(!Matched::Union{LinRange, StepRangeLen}) at range.jl:664
  iterate(!Matched::Union{LinRange, StepRangeLen}, !Matched::Int64) at range.jl:664
  iterate(!Matched::T) where T<:Union{Base.KeySet{var"#s79", var"#s78"} where {var"#s79", var"#s78"<:Dict}, Base.ValueIterator{var"#s77"} where var"#s77"<:Dict} at dict.jl:693
  ...
Stacktrace:
  [1] jlwrap_iterator(o::Fatou.Rectangle)
    @ PyCall ~/.julia/packages/PyCall/BD546/src/pyiterator.jl:144
  [2] pyjlwrap_getiter(self_::Ptr{PyCall.PyObject_struct})
    @ PyCall ~/.julia/packages/PyCall/BD546/src/pyiterator.jl:125
  [3] macro expansion
    @ ~/.julia/packages/PyCall/BD546/src/exception.jl:95 [inlined]
  [4] #107
    @ ~/.julia/packages/PyCall/BD546/src/pyfncall.jl:43 [inlined]
  [5] disable_sigint
    @ ./c.jl:458 [inlined]
  [6] __pycall!
    @ ~/.julia/packages/PyCall/BD546/src/pyfncall.jl:42 [inlined]
  [7] _pycall!(ret::PyCall.PyObject, o::PyCall.PyObject, args::Tuple{Matrix{UInt16}}, nargs::Int64, kw::PyCall.PyObject)
    @ PyCall ~/.julia/packages/PyCall/BD546/src/pyfncall.jl:29
  [8] _pycall!(ret::PyCall.PyObject, o::PyCall.PyObject, args::Tuple{Matrix{UInt16}}, kwargs::Base.Iterators.Pairs{Symbol, Any, Tuple{Symbol, Symbol}, NamedTuple{(:cmap, :extent), Tuple{String, Fatou.Rectangle}}})
    @ PyCall ~/.julia/packages/PyCall/BD546/src/pyfncall.jl:11
  [9] #pycall#113
    @ ~/.julia/packages/PyCall/BD546/src/pyfncall.jl:83 [inlined]
 [10] imshow(args::Matrix{UInt16}; kws::Base.Iterators.Pairs{Symbol, Any, Tuple{Symbol, Symbol}, NamedTuple{(:cmap, :extent), Tuple{String, Fatou.Rectangle}}})
    @ PyPlot ~/.julia/packages/PyPlot/XHEG0/src/PyPlot.jl:177
 [11] imshow(K::Fatou.FilledSet{SyntaxTree.var"#41#42", SyntaxTree.var"#43#44", SyntaxTree.var"#45#46", false, true, false, false}; cmap::String, bare::Bool)
    @ Fatou ~/.julia/dev/Fatou/src/pyplot.jl:9
 [12] #plot#40
    @ ~/.julia/dev/Fatou/src/pyplot.jl:4 [inlined]
 [13] plot
    @ ~/.julia/dev/Fatou/src/pyplot.jl:4 [inlined]
 [14] |>(x::Fatou.FilledSet{SyntaxTree.var"#41#42", SyntaxTree.var"#43#44", SyntaxTree.var"#45#46", false, true, false, false}, f::typeof(plot))
    @ Base ./operators.jl:858
 [15] top-level scope
    @ REPL[12]:1
 [16] eval
    @ ./boot.jl:360 [inlined]
 [17] eval_user_input(ast::Any, backend::REPL.REPLBackend)
    @ REPL /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/REPL.jl:139
 [18] repl_backend_loop(backend::REPL.REPLBackend)
    @ REPL /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/REPL.jl:200
 [19] start_repl_backend(backend::REPL.REPLBackend, consumer::Any)
    @ REPL /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/REPL.jl:185
 [20] run_repl(repl::REPL.AbstractREPL, consumer::Any; backend_on_current_task::Bool)
    @ REPL /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/REPL.jl:317
 [21] run_repl(repl::REPL.AbstractREPL, consumer::Any)
    @ REPL /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.6/REPL/src/REPL.jl:305
 [22] (::Base.var"#874#876"{Bool, Bool, Bool})(REPL::Module)
    @ Base ./client.jl:387
 [23] #invokelatest#2
    @ ./essentials.jl:708 [inlined]
 [24] invokelatest
    @ ./essentials.jl:706 [inlined]
 [25] run_main_repl(interactive::Bool, quiet::Bool, banner::Bool, history_file::Bool, color_set::Bool)
    @ Base ./client.jl:372
 [26] exec_options(opts::Base.JLOptions)
    @ Base ./client.jl:302
 [27] _start()
    @ Base ./client.jl:485
Stacktrace:
  [1] pyerr_check
    @ ~/.julia/packages/PyCall/BD546/src/exception.jl:62 [inlined]
  [2] pyerr_check
    @ ~/.julia/packages/PyCall/BD546/src/exception.jl:66 [inlined]
  [3] _handle_error(msg::String)
    @ PyCall ~/.julia/packages/PyCall/BD546/src/exception.jl:83
  [4] macro expansion
    @ ~/.julia/packages/PyCall/BD546/src/exception.jl:97 [inlined]
  [5] #107
    @ ~/.julia/packages/PyCall/BD546/src/pyfncall.jl:43 [inlined]
  [6] disable_sigint
    @ ./c.jl:458 [inlined]
  [7] __pycall!
    @ ~/.julia/packages/PyCall/BD546/src/pyfncall.jl:42 [inlined]
  [8] _pycall!(ret::PyCall.PyObject, o::PyCall.PyObject, args::Tuple{Matrix{UInt16}}, nargs::Int64, kw::PyCall.PyObject)
    @ PyCall ~/.julia/packages/PyCall/BD546/src/pyfncall.jl:29
  [9] _pycall!(ret::PyCall.PyObject, o::PyCall.PyObject, args::Tuple{Matrix{UInt16}}, kwargs::Base.Iterators.Pairs{Symbol, Any, Tuple{Symbol, Symbol}, NamedTuple{(:cmap, :extent), Tuple{String, Fatou.Rectangle}}})
    @ PyCall ~/.julia/packages/PyCall/BD546/src/pyfncall.jl:11
 [10] #pycall#113
    @ ~/.julia/packages/PyCall/BD546/src/pyfncall.jl:83 [inlined]
 [11] imshow(args::Matrix{UInt16}; kws::Base.Iterators.Pairs{Symbol, Any, Tuple{Symbol, Symbol}, NamedTuple{(:cmap, :extent), Tuple{String, Fatou.Rectangle}}})
    @ PyPlot ~/.julia/packages/PyPlot/XHEG0/src/PyPlot.jl:177
 [12] imshow(K::Fatou.FilledSet{SyntaxTree.var"#41#42", SyntaxTree.var"#43#44", SyntaxTree.var"#45#46", false, true, false, false}; cmap::String, bare::Bool)
    @ Fatou ~/.julia/dev/Fatou/src/pyplot.jl:9
 [13] #plot#40
    @ ~/.julia/dev/Fatou/src/pyplot.jl:4 [inlined]
 [14] plot
    @ ~/.julia/dev/Fatou/src/pyplot.jl:4 [inlined]
 [15] |>(x::Fatou.FilledSet{SyntaxTree.var"#41#42", SyntaxTree.var"#43#44", SyntaxTree.var"#45#46", false, true, false, false}, f::typeof(plot))
    @ Base ./operators.jl:858
 [16] top-level scope
    @ REPL[12]:1