# Compatibility across Julia 1+ versions

**URL:** https://discourse.julialang.org/t/compatibility-across-julia-1-versions/27196
**Category:** General Usage
**Created:** [August 6, 2019, 1:29am UTC](https://discourse.julialang.org/t/compatibility-across-julia-1-versions/27196 "2019-08-06T01:29:47Z")
**Posts on this page:** 1
**Showing post:** 15

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### Author: ![Palli](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/palli/32/3380_2.png) [@Palli](https://discourse.julialang.org/u/Palli)
#### Post date: [August 8, 2019, 2:21pm UTC](https://discourse.julialang.org/t/compatibility-across-julia-1-versions/27196/15 "2019-08-08T14:21:28Z")

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> [@StefanKarpinski](#):
>
> can get RPC between different versions of Julia working

I’m looking into that. FYI: Indirectly to help me with at, I’m trying to use this package (that must have worked at some point), and I get a segfault when precompiling in Julia 1.0.4, but not in Julia 1.1 (can someone explain the ERROR there?), while still not working… so I opened an issue:

> <https://github.com/JuliaCN/Py2Jl/issues/5>
>
> I'm looking into debugging this, I thought it might be the new improved PyCall n…ot working with this package, but even forcing the rev. you used didn't work:
> 
> \[I doubt it should matter, but maybe me using Julia Version 1.2.0-DEV.55 is the problem? At least Julia 1.1.1 (or 1.0.x) should work, see next comment. \<s\>Have not yet checked 1.0.x\</s\>\]
> 
> \`\`\`
> julia\> py2jl"""
> def sum\_by(f, seq):
> s = 0
> for e in seq:
> s = s + f(e)
> return s
> result = sum\_by(lambda x: x \* 10, \[1, 2, 3\])
> """
> ERROR: LoadError: "class: Module, attributes: Symbol\[:class, :body\]."
> Stacktrace:
> \[1\] (::getfield(Py2Jl.ASTGen, Symbol("##12#122")){Nothing,getfield(Py2Jl.ASTGen, Symbol("#trans\_block#121")){getfield(Py2Jl.ASTGen, Symbol("##7#114")){Nothing}}})(::Dict{Symbol,Any}) at /home/qwerty/.julia/packages/Py2Jl/G6hOG/src/ASTGen.jl:392
> \[2\] to\_ast(::Nothing, ::Dict{Symbol,Any}) at /home/qwerty/.julia/packages/Py2Jl/G6hOG/src/ASTGen.jl:398
> \[3\] py2jl(::Nothing, ::String) at /home/qwerty/.julia/packages/Py2Jl/G6hOG/src/Py2Jl.jl:43
> \[4\] @py2jl\_str(::LineNumberNode, ::Module, ::Any) at /home/qwerty/.julia/packages/Py2Jl/G6hOG/src/Py2Jl.jl:51
> in expression starting at REPL\[5\]:1
> \`\`\`
> 
> (v1.2) pkg\> st
> Status \`~/.julia/environments/v1.2/Project.toml\`
> \[537997a7\] AbstractPlotting v0.9.5
> \[6e4b80f9\] BenchmarkTools v0.4.2
> \[a93c6f00\] DataFrames v0.17.1
> \[864edb3b\] DataStructures v0.15.0
> \[e9467ef8\] GLMakie v0.0.4
> \[54eb57ff\] InteractiveCodeSearch v0.3.0
> \[6042db11\] JDBC v0.4.1
> \[682c06a0\] JSON v0.21.0
> \[d8e11817\] MLStyle v0.3.0
> \[ee78f7c6\] Makie v0.9.1
> \[dbd62bd0\] MakieGallery v0.0.4
> \[c020b1a1\] NaturalSort v0.0.1+ #fix\_for\_1\_0\_0 (http://github.com/endrebak/NaturalSort.jl)
> \[9b87118b\] PackageCompiler v0.6.3
> \[91a5bcdd\] Plots v0.26.0
> \[e53ffe30\] Py2Jl v0.1.0 #master (https://github.com/JuliaCN/Py2Jl.jl)
> \[438e738f\] PyCall v1.91.2+ #1309efc (https://github.com/JuliaPy/PyCall.jl.git)
> \[d330b81b\] PyPlot v2.7.0
> \[bf110322\] Python v0.1.0 #master (https://github.com/229668880/Python.jl)
> \[1a8c2f83\] Query v0.11.0
> \[e6cf234a\] RandomNumbers v1.2.0
> \[f2b01f46\] Roots v0.8.1
> \[3646fa90\] ScikitLearn v0.5.0
> \[992d4aef\] Showoff v0.2.1
> \[98e33af6\] SimpleDirectMediaLayer v0.1.0
> \[276daf66\] SpecialFunctions v0.7.2
> \[65254759\] StatsMakie v0.0.2
> \[9a3f8284\] Random

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