Incompatible with PythonCall.jl

[LilithHafner]

I can't load this package and PythonCall.jl in the same Julia session without error

x@x dev % julia
               _
   _       _ _(_)_     |  Documentation: https://docs.julialang.org
  (_)     | (_) (_)    |
   _ _   _| |_  __ _   |  Type "?" for help, "]?" for Pkg help.
  | | | | | | |/ _' |  |
  | | |_| | | | (_| |  |  Version 1.9.3 (2023-08-24)
 _/ |\__'_|_|_|\__'_|  |  Official https://julialang.org/ release
|__/                   |

julia> using PyCall, PythonCall
    CondaPkg Found dependencies: /Users/x/.julia/packages/PythonCall/qTEA1/CondaPkg.toml
    CondaPkg Dependencies already up to date
ERROR: InitError: Python: SystemError: initialization of _datetime did not return an extension module
Python stacktrace:
 [1] <module>
   @ 
SYSTEM (REPL): showing an error caused an error
ERROR: Python: 
SYSTEM (REPL): caught exception of type PyException while trying to handle a nested exception; giving up

julia> 
x@x dev % julia
               _
   _       _ _(_)_     |  Documentation: https://docs.julialang.org
  (_)     | (_) (_)    |
   _ _   _| |_  __ _   |  Type "?" for help, "]?" for Pkg help.
  | | | | | | |/ _' |  |
  | | |_| | | | (_| |  |  Version 1.9.3 (2023-08-24)
 _/ |\__'_|_|_|\__'_|  |  Official https://julialang.org/ release
|__/                   |

julia> using PythonCall, PyCall
    CondaPkg Found dependencies: /Users/x/.julia/packages/PythonCall/qTEA1/CondaPkg.toml
    CondaPkg Dependencies already up to date
julia(25115,0x206e11b40) malloc: *** error for object 0x137f60050: pointer being freed was not allocated
julia(25115,0x206e11b40) malloc: *** set a breakpoint in malloc_error_break to debug

[25115] signal (6): Abort trap: 6
in expression starting at REPL[1]:1
__pthread_kill at /usr/lib/system/libsystem_kernel.dylib (unknown line)
Allocations: 8260202 (Pool: 8255891; Big: 4311); GC: 12
zsh: abort      julia
x@x dev % julia
               _
   _       _ _(_)_     |  Documentation: https://docs.julialang.org
  (_)     | (_) (_)    |
   _ _   _| |_  __ _   |  Type "?" for help, "]?" for Pkg help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 1.9.3 (2023-08-24)
 _/ |\__'_|_|_|\__'_|  |  Official https://julialang.org/ release
|__/                   |

julia> versioninfo()
Julia Version 1.9.3
Commit bed2cd540a1 (2023-08-24 14:43 UTC)
Build Info:
  Official https://julialang.org/ release
Platform Info:
  OS: macOS (arm64-apple-darwin22.4.0)
  CPU: 8 × Apple M2
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-14.0.6 (ORCJIT, apple-m1)
  Threads: 1 on 4 virtual cores
Environment:
  JULIA_EDITOR = code

[LilithHafner]

Adding documentation pointing to https://juliapy.github.io/PythonCall.jl/stable/pycall/#Tips would help, making the error give that hint would be even better.

[PallHaraldsson]

Is this still relevant, or was it actually?

I mean the link no longer works, should point to current docs on using together, which claim possible. I do not want to claim possible to use together, if actually not possible in some edge cases, but I think it might not be impossible if done correctly (maybe only on 1.10.5?).

Should PyCall be deprecated? And/or at the README least point PythonCall.jl, as an alternative? I meant to open an issue/PR, to that effect, but hesitate because of this open one...

[stevengj]

In principle, it should be possible to use both PyCall and PythonCall simultaneously, if you configure them to use the same Python installation?

[stevengj]

Alternatively, since PythonCall can use any Python determined at runtime, possibly you can tell it to use PyCall's python at runtime if you load the latter first.

[stevengj]

This is documented here: https://juliapy.github.io/PythonCall.jl/stable/faq/#Can-I-use-PythonCall-and-PyCall-together?

So I think this issue can be closed?