use pyPreferences

Author: PhilipVinc

Project.toml

@@ -9,14 +9,15 @@ Dates = "ade2ca70-3891-5945-98fb-dc099432e06a"
 Libdl = "8f399da3-3557-5675-b5ff-fb832c97cbdb"
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
 MacroTools = "1914dd2f-81c6-5fcd-8719-6d5c9610ff09"
+PyPreferences = "cc9521c6-0242-4dda-8d66-c47a9d9eec02"
 Serialization = "9e88b42a-f829-5b0c-bbe9-9e923198166b"
 VersionParsing = "81def892-9a0e-5fdd-b105-ffc91e053289"
 
 [compat]
 Conda = "1.0"
 MacroTools = "0.4, 0.5"
 VersionParsing = "1.0"
-julia = "0.7, 1.0"
+julia = "1.6"
 
 [extras]
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"

src/PyCall.jl

@@ -4,6 +4,7 @@ if isdefined(Base, :Experimental) && isdefined(Base.Experimental, Symbol("@optle
     @eval Base.Experimental.@optlevel 1
 end
 
+using PyPreferences
 using VersionParsing
 
 export pycall, pycall!, pyimport, pyimport_e, pybuiltin, PyObject, PyReverseDims,

src/pyinit.jl

@@ -201,7 +201,7 @@ function __init__()
 
     if new_pyversion.major != pyversion.major
         error("PyCall precompiled with Python $pyversion, but now using Python $new_pyversion; ",
-              "you need to relaunch Julia and re-run Pkg.build(\"PyCall\")")
+              "you need to relaunch Julia and run `using PyPrefernces; PyPreferences.recompile()")
     end
 
     copy!(inspect, pyimport("inspect"))

src/startup.jl

@@ -38,17 +38,22 @@ else
     global symbols_present = hassym(proc_handle, :Py_GetVersion)
 end
 
+if PyPreferences.inprocess
+    @assert symbols_present # TODO: better error
+end
+
 if !symbols_present
+    PyPreferences.assert_configured()
+    using PyPreferences: PYTHONHOME, conda, libpython, pyprogramname, python, pyversion_build
     # Python not present. Use deps.jl
     const depfile = joinpath(dirname(@__FILE__), "..", "deps", "deps.jl")
-    isfile(depfile) || error("PyCall not properly installed. Please run Pkg.build(\"PyCall\")")
-    include(depfile) # generated by Pkg.build("PyCall")
+
     # Only to be used at top-level - pointer will be invalid after reload
     libpy_handle = try
         Libdl.dlopen(libpython, Libdl.RTLD_LAZY|Libdl.RTLD_DEEPBIND|Libdl.RTLD_GLOBAL)
     catch err
         if err isa ErrorException
-            error(err.msg, ". Please run `Pkg.build(\"PyCall\")` if your Python build has changed")
+            error(err.msg, "\n", PyPreferences.instruction_message())
         else
             rethrow(err)
         end