SymPy.jl not threadsafe?

[jamblejoe]

While working with polynomials in SymPy.jl I encountered segfaults when using Julia threads. MWE:

julia> using SymPy

julia> @syms a
(a,)

julia> p = sympy.Poly(a^2 + 3*a -2, a)
Poly(a**2 + 3*a - 2, a, domain='ZZ')

julia> for i in 0:2; @show p.coeff_monomial(a^i); end
p.coeff_monomial(a ^ i) = -2
p.coeff_monomial(a ^ i) = 3
p.coeff_monomial(a ^ i) = 1

julia> Threads.@threads for i in 0:2; @show p.coeff_monomial(a^i); end

signal (11): Segmentation fault
in expression starting at REPL[12]:1

signal (11): Segmentation fault
in expression starting at REPL[12]:1
PyObject_GC_Del at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalFrameDefault at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalCodeWithName at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyFunction_Vectorcall at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyObject_Malloc at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyObject_GC_Malloc at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
call_function at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyObject_GC_New at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalFrameDefault at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyTraceBack_FromFrame at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalCodeWithName at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
PyTraceBack_Here at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyFunction_Vectorcall at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalFrameDefault at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyObject_FastCallDict at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalCodeWithName at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyObject_Call_Prepend at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyFunction_Vectorcall at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
call_function at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
slot_tp_init at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalFrameDefault at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
function_code_fastcall at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
type_call.lto_priv.242 at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyObject_MakeTpCall at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
call_function at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalFrameDefault at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
call_function at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalFrameDefault at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalCodeWithName at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyFunction_Vectorcall at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
function_code_fastcall at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyObject_FastCall_Prepend at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
call_function at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalFrameDefault at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalCodeWithName at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyFunction_Vectorcall at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
slot_tp_richcompare at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
PyObject_RichCompare at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
PyObject_RichCompareBool at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
call_function at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalFrameDefault at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalCodeWithName at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyFunction_Vectorcall at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyObject_FastCallDict at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyObject_Call_Prepend at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
tuplerichcompare.lto_priv.211 at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
PyObject_RichCompare at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalFrameDefault at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
slot_tp_init at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
function_code_fastcall at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
type_call.lto_priv.242 at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyObject_MakeTpCall at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
method_vectorcall at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
call_function at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalFrameDefault at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
call_function at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalFrameDefault at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalCodeWithName at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyFunction_Vectorcall at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
function_code_fastcall at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
call_function at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalFrameDefault at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalCodeWithName at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyFunction_Vectorcall at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyObject_FastCallDict at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
method_vectorcall at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyObject_Call_Prepend at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
PyVectorcall_Call at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
macro expansion at /home/goran/.julia/packages/PyCall/BD546/src/exception.jl:95 [inlined]
#107 at /home/goran/.julia/packages/PyCall/BD546/src/pyfncall.jl:43 [inlined]
disable_sigint at ./c.jl:458 [inlined]
__pycall! at /home/goran/.julia/packages/PyCall/BD546/src/pyfncall.jl:42 [inlined]
_pycall! at /home/goran/.julia/packages/PyCall/BD546/src/pyfncall.jl:29
_pycall! at /home/goran/.julia/packages/PyCall/BD546/src/pyfncall.jl:11
unknown function (ip: 0x7f8fd7194263)
_jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2237 [inlined]
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2419
#_#114 at /home/goran/.julia/packages/PyCall/BD546/src/pyfncall.jl:86
_jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2237 [inlined]
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2419
slot_tp_init at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
jl_apply at /buildworker/worker/package_linux64/build/src/julia.h:1703 [inlined]
do_apply at /buildworker/worker/package_linux64/build/src/builtins.c:670
PyObject at /home/goran/.julia/packages/PyCall/BD546/src/pyfncall.jl:86
_jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2237 [inlined]
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2419
macro expansion at ./show.jl:955 [inlined]
macro expansion at ./REPL[12]:1 [inlined]
#21#threadsfor_fun at ./threadingconstructs.jl:81
#21#threadsfor_fun at ./threadingconstructs.jl:48
unknown function (ip: 0x7f8fd719616c)
_jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2237 [inlined]
type_call.lto_priv.242 at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2419
_PyObject_MakeTpCall at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
jl_apply at /buildworker/worker/package_linux64/build/src/julia.h:1703 [inlined]
call_function at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
start_task at /buildworker/worker/package_linux64/build/src/task.c:839
_PyEval_EvalFrameDefault at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalCodeWithName at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyFunction_Vectorcall at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
unknown function (ip: (nil))
Allocations: 9128275 (Pool: 9125487; Big: 2788); GC: 11
Segmentation fault

Is this only problematic with some functions or is SymPy.jl in general not threadsafe?

[jverzani]

Hmm, I can't reproduce this on my Mac laptop. The first thing I tried was whether it was an issue with PyCall and not something in SymPy. Could you try running the following to see if it brings about a similar error?

import PyCall
const sympy = PyCall.pyimport_conda("sympy", "sympy")
a = sympy.symbols("a")
p = sympy.Poly(a^2 + 3*a -2, a)
for i in 0:2; @show p.coeff_monomial(a^i); end
Threads.@threads for i in 0:2; @show p.coeff_monomial(a^i); end

[jamblejoe]

I have to say that I am on WSL 2 Ubuntu 20.04 on Windows 10 Pro 21H1. This is the output:

julia> import PyCall

julia> const sympy = PyCall.pyimport_conda("sympy", "sympy")
PyObject <module 'sympy' from '/home/goran/.julia/conda/3/lib/python3.8/site-packages/sympy/__init__.py'>

julia> a = sympy.symbols("a")
PyObject a

julia> p = sympy.Poly(a^2 + 3*a -2, a)
PyObject Poly(a**2 + 3*a - 2, a, domain='ZZ')

julia> for i in 0:2; @show p.coeff_monomial(a^i); end
p.coeff_monomial(a ^ i) = PyObject -2
p.coeff_monomial(a ^ i) = PyObject 3
p.coeff_monomial(a ^ i) = PyObject 1

julia> Threads.@threads for i in 0:2; @show p.coeff_monomial(a^i); end

signal (11): Segmentation fault
in expression starting at REPL[8]:1
p.coeff_monomial(a ^ i) = PyObject -2
p.coeff_monomial(a ^ i) = PyObject 3
_PyObject_Malloc at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
PyUnicode_New at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyUnicodeWriter_PrepareInternal at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyUnicodeWriter_WriteASCIIString at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
PyUnicode_FromFormatV at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
PyErr_Format at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
PyObject_GetBuffer at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
isbuftype! at /home/goran/.julia/packages/PyCall/BD546/src/pybuffer.jl:134 [inlined]
isbuftype at /home/goran/.julia/packages/PyCall/BD546/src/pybuffer.jl:148 [inlined]
pysequence_query at /home/goran/.julia/packages/PyCall/BD546/src/conversions.jl:759
pytype_query at /home/goran/.julia/packages/PyCall/BD546/src/conversions.jl:773
pytype_query at /home/goran/.julia/packages/PyCall/BD546/src/conversions.jl:806 [inlined]
convert at /home/goran/.julia/packages/PyCall/BD546/src/conversions.jl:831
getproperty at /home/goran/.julia/packages/PyCall/BD546/src/PyCall.jl:312
_jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2237 [inlined]
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2419
macro expansion at ./show.jl:955 [inlined]
macro expansion at ./REPL[8]:1 [inlined]
#4#threadsfor_fun at ./threadingconstructs.jl:81
#4#threadsfor_fun at ./threadingconstructs.jl:48
unknown function (ip: 0x7fd36411cc9c)
_jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2237 [inlined]
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2419
jl_apply at /buildworker/worker/package_linux64/build/src/julia.h:1703 [inlined]
start_task at /buildworker/worker/package_linux64/build/src/task.c:839
unknown function (ip: (nil))
Allocations: 15299065 (Pool: 15294286; Big: 4779); GC: 20
Segmentation fault

julia> versioninfo()
Julia Version 1.6.1
Commit 6aaedecc44 (2021-04-23 05:59 UTC)
Platform Info:
  OS: Linux (x86_64-pc-linux-gnu)
  CPU: AMD Ryzen Threadripper 3960X 24-Core Processor
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-11.0.1 (ORCJIT, znver2)

On the host OS, Windows 10 PRO 21H1, I don't get segfault but ReadOnlyMemory() error:

julia> import PyCall

julia> const sympy = PyCall.pyimport_conda("sympy", "sympy")
PyObject <module 'sympy' from 'C:\\Users\\gonak\\.julia\\conda\\3\\lib\\site-packages\\sympy\\__init__.py'>

julia> a = sympy.symbols("a")
PyObject a

julia> p = sympy.Poly(a^2 + 3*a -2, a)
PyObject Poly(a**2 + 3*a - 2, a, domain='ZZ')

julia> for i in 0:2; @show p.coeff_monomial(a^i); end
p.coeff_monomial(a ^ i) = PyObject -2
p.coeff_monomial(a ^ i) = PyObject 3
p.coeff_monomial(a ^ i) = PyObject 1

julia> Threads.@threads for i in 0:2; @show p.coeff_monomial(a^i); end
p.coeff_monomial(a ^ i) = ERROR: PyObject -2TaskFailedException

Stacktrace:
 [1] wait
   @ .\task.jl:322 [inlined]
 [2] threading_run(func::Function)
   @ Base.Threads .\threadingconstructs.jl:34
 [3] top-level scope
   @ .\threadingconstructs.jl:93

    nested task error: ReadOnlyMemoryError()
    Stacktrace:
     [1] macro expansion
       @ C:\Users\gonak\.julia\packages\PyCall\BD546\src\exception.jl:95 [inlined]
     [2] ^
       @ C:\Users\gonak\.julia\packages\PyCall\BD546\src\pyoperators.jl:18 [inlined]
     [3] ^(a::PyCall.PyObject, b::Int64)
       @ PyCall C:\Users\gonak\.julia\packages\PyCall\BD546\src\pyoperators.jl:21
     [4] macro expansion
       @ .\show.jl:955 [inlined]
     [5] macro expansion
       @ .\REPL[14]:1 [inlined]
     [6] (::var"#23#threadsfor_fun#2"{UnitRange{Int64}})(onethread::Bool)
       @ Main .\threadingconstructs.jl:81
     [7] (::var"#23#threadsfor_fun#2"{UnitRange{Int64}})()
       @ Main .\threadingconstructs.jl:48

julia> versioninfo()
Julia Version 1.6.1
Commit 6aaedecc44 (2021-04-23 05:59 UTC)
Platform Info:
  OS: Windows (x86_64-w64-mingw32)
  CPU: AMD Ryzen Threadripper 3960X 24-Core Processor
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-11.0.1 (ORCJIT, znver2)

[jamblejoe]

For WSL:

julia> Conda.list()
[ Info: Running `conda list` in root environment
# packages in environment at /home/goran/.julia/conda/3:
#
# Name                    Version                   Build  Channel
_libgcc_mutex             0.1                        main
anyio                     2.2.0            py38h06a4308_1
argon2-cffi               20.1.0           py38h27cfd23_1
async_generator           1.10               pyhd3eb1b0_0
attrs                     21.2.0             pyhd3eb1b0_0
babel                     2.9.1              pyhd3eb1b0_0
backcall                  0.2.0              pyhd3eb1b0_0
blas                      1.0                         mkl
bleach                    3.3.0              pyhd3eb1b0_0
brotlipy                  0.7.0           py38h27cfd23_1003
ca-certificates           2021.5.25            h06a4308_1
certifi                   2021.5.30        py38h06a4308_0
cffi                      1.14.3           py38h261ae71_2
chardet                   3.0.4           py38h06a4308_1003
conda                     4.10.1           py38h06a4308_1
conda-package-handling    1.7.2            py38h03888b9_0
cryptography              3.2.1            py38h3c74f83_1
cycler                    0.10.0                   py38_0
dbus                      1.13.18              hb2f20db_0
decorator                 5.0.9              pyhd3eb1b0_0
defusedxml                0.7.1              pyhd3eb1b0_0
entrypoints               0.3                      py38_0
expat                     2.4.1                h2531618_2
fontconfig                2.13.1               h6c09931_0
freetype                  2.10.4               h5ab3b9f_0
glib                      2.68.2               h36276a3_0
gmp                       6.2.1                h2531618_2
gmpy2                     2.0.8            py38hd5f6e3b_3
gst-plugins-base          1.14.0               h8213a91_2
gstreamer                 1.14.0               h28cd5cc_2
icu                       58.2                 he6710b0_3
idna                      2.10                       py_0
importlib-metadata        3.10.0           py38h06a4308_0
importlib_metadata        3.10.0               hd3eb1b0_0
intel-openmp              2021.2.0           h06a4308_610
ipykernel                 5.3.4            py38h5ca1d4c_0
ipython                   7.22.0           py38hb070fc8_0
ipython_genutils          0.2.0              pyhd3eb1b0_1
jedi                      0.17.0                   py38_0
jinja2                    3.0.0              pyhd3eb1b0_0
jpeg                      9b                   h024ee3a_2
json5                     0.9.5                      py_0
jsonschema                3.2.0                      py_2
jupyter-packaging         0.7.12             pyhd3eb1b0_0
jupyter_client            6.1.12             pyhd3eb1b0_0
jupyter_core              4.7.1            py38h06a4308_0
jupyter_server            1.4.1            py38h06a4308_0
jupyterlab                2.3.1              pyhd3eb1b0_0
jupyterlab_pygments       0.1.2                      py_0
jupyterlab_server         1.2.0                      py_0
kiwisolver                1.3.1            py38h2531618_0
lcms2                     2.12                 h3be6417_0
ld_impl_linux-64          2.33.1               h53a641e_7
libedit                   3.1.20191231         h14c3975_1
libffi                    3.3                  he6710b0_2
libgcc                    7.2.0                h69d50b8_2
libgcc-ng                 9.1.0                hdf63c60_0
libpng                    1.6.37               hbc83047_0
libsodium                 1.0.18               h7b6447c_0
libstdcxx-ng              9.1.0                hdf63c60_0
libtiff                   4.2.0                h85742a9_0
libuuid                   1.0.3                h1bed415_2
libuv                     1.40.0               h7b6447c_0
libwebp-base              1.2.0                h27cfd23_0
libxcb                    1.14                 h7b6447c_0
libxml2                   2.9.10               hb55368b_3
lz4-c                     1.9.3                h2531618_0
markupsafe                2.0.1            py38h27cfd23_0
matplotlib                3.3.4            py38h06a4308_0
matplotlib-base           3.3.4            py38h62a2d02_0
mistune                   0.8.4           py38h7b6447c_1000
mkl                       2021.2.0           h06a4308_296
mkl-service               2.3.0            py38h27cfd23_1
mkl_fft                   1.3.0            py38h42c9631_2
mkl_random                1.2.1            py38ha9443f7_2
mpc                       1.1.0                h10f8cd9_1
mpfr                      4.0.2                hb69a4c5_1
mpmath                    1.2.1            py38h06a4308_0
nbclassic                 0.2.6              pyhd3eb1b0_0
nbclient                  0.5.3              pyhd3eb1b0_0
nbconvert                 6.0.7                    py38_0
nbformat                  5.1.3              pyhd3eb1b0_0
ncurses                   6.2                  he6710b0_1
nest-asyncio              1.5.1              pyhd3eb1b0_0
nodejs                    10.13.0              he6710b0_0
notebook                  6.4.0            py38h06a4308_0
numpy                     1.20.2           py38h2d18471_0
numpy-base                1.20.2           py38hfae3a4d_0
olefile                   0.46                       py_0
openssl                   1.1.1k               h27cfd23_0
packaging                 20.9               pyhd3eb1b0_0
pandoc                    2.12                 h06a4308_0
pandocfilters             1.4.3            py38h06a4308_1
parso                     0.8.2              pyhd3eb1b0_0
pcre                      8.44                 he6710b0_0
pexpect                   4.8.0              pyhd3eb1b0_3
pickleshare               0.7.5           pyhd3eb1b0_1003
pillow                    8.2.0            py38he98fc37_0
pip                       20.2.4           py38h06a4308_0
prometheus_client         0.10.1             pyhd3eb1b0_0
prompt-toolkit            3.0.17             pyh06a4308_0
ptyprocess                0.7.0              pyhd3eb1b0_2
pycosat                   0.6.3            py38h7b6447c_1
pycparser                 2.20                       py_2
pygments                  2.9.0              pyhd3eb1b0_0
pyopenssl                 19.1.0             pyhd3eb1b0_1
pyparsing                 2.4.7              pyhd3eb1b0_0
pyqt                      5.9.2            py38h05f1152_4
pyrsistent                0.17.3           py38h7b6447c_0
pysocks                   1.7.1            py38h06a4308_0
python                    3.8.5                h7579374_1
python-dateutil           2.8.1              pyhd3eb1b0_0
pytz                      2021.1             pyhd3eb1b0_0
pyzmq                     20.0.0           py38h2531618_1
qt                        5.9.7                h5867ecd_1
readline                  8.0                  h7b6447c_0
requests                  2.24.0                     py_0
ruamel_yaml               0.15.87          py38h7b6447c_1
send2trash                1.5.0              pyhd3eb1b0_1
setuptools                50.3.1           py38h06a4308_1
sip                       4.19.13          py38he6710b0_0
six                       1.15.0           py38h06a4308_0
sniffio                   1.2.0            py38h06a4308_1
sqlite                    3.33.0               h62c20be_0
sympy                     1.8              py38h06a4308_0
terminado                 0.9.4            py38h06a4308_0
testpath                  0.4.4              pyhd3eb1b0_0
tk                        8.6.10               hbc83047_0
tornado                   6.1              py38h27cfd23_0
tqdm                      4.51.0             pyhd3eb1b0_0
traitlets                 5.0.5              pyhd3eb1b0_0
urllib3                   1.25.11                    py_0
wcwidth                   0.2.5                      py_0
webencodings              0.5.1                    py38_1
wheel                     0.35.1             pyhd3eb1b0_0
xz                        5.2.5                h7b6447c_0
yaml                      0.2.5                h7b6447c_0
zeromq                    4.3.4                h2531618_0
zipp                      3.4.1              pyhd3eb1b0_0
zlib                      1.2.11               h7b6447c_3
zstd                      1.4.9                haebb681_0

For windows:

julia> Conda.list()
[ Info: Running `conda list` in root environment
# packages in environment at C:/Users/gonak/.julia/conda/3/:
#
# Name                    Version                   Build  Channel
anyio                     2.2.0            py38haa95532_2
argon2-cffi               20.1.0           py38h2bbff1b_1
async_generator           1.10               pyhd3eb1b0_0
attrs                     21.2.0             pyhd3eb1b0_0
babel                     2.9.1              pyhd3eb1b0_0
backcall                  0.2.0              pyhd3eb1b0_0
blas                      1.0                         mkl
bleach                    3.3.0              pyhd3eb1b0_0
brotlipy                  0.7.0           py38h2bbff1b_1003
ca-certificates           2021.5.25            haa95532_1
certifi                   2021.5.30        py38haa95532_0
cffi                      1.14.3           py38hcd4344a_2
chardet                   3.0.4           py38haa95532_1003
colorama                  0.4.4              pyhd3eb1b0_0
conda                     4.10.1           py38haa95532_1
conda-package-handling    1.7.2            py38h76e460a_0
console_shortcut          0.1.1                         4
cryptography              3.2.1            py38hcd4344a_1
decorator                 5.0.9              pyhd3eb1b0_0
defusedxml                0.7.1              pyhd3eb1b0_0
entrypoints               0.3                      py38_0
icu                       58.2                 ha925a31_3
idna                      2.10                       py_0
importlib-metadata        3.10.0           py38haa95532_0
importlib_metadata        3.10.0               hd3eb1b0_0
intel-openmp              2021.2.0           haa95532_616
ipykernel                 5.3.4            py38h5ca1d4c_0
ipython                   7.22.0           py38hd4e2768_0
ipython_genutils          0.2.0              pyhd3eb1b0_1
ipywidgets                7.6.3              pyhd3eb1b0_1
jedi                      0.17.0                   py38_0
jinja2                    3.0.0              pyhd3eb1b0_0
jpeg                      9b                   hb83a4c4_2
json5                     0.9.5                      py_0
jsonschema                3.2.0                      py_2
jupyter                   1.0.0                    py38_7
jupyter-packaging         0.7.12             pyhd3eb1b0_0
jupyter_client            6.1.12             pyhd3eb1b0_0
jupyter_console           6.4.0              pyhd3eb1b0_0
jupyter_core              4.7.1            py38haa95532_0
jupyter_server            1.4.1            py38haa95532_0
jupyterlab                3.0.14             pyhd3eb1b0_1
jupyterlab_pygments       0.1.2                      py_0
jupyterlab_server         2.4.0              pyhd3eb1b0_0
jupyterlab_widgets        1.0.0              pyhd3eb1b0_1
libpng                    1.6.37               h2a8f88b_0
libsodium                 1.0.18               h62dcd97_0
m2w64-gcc-libgfortran     5.3.0                         6
m2w64-gcc-libs            5.3.0                         7
m2w64-gcc-libs-core       5.3.0                         7
m2w64-gmp                 6.1.0                         2
m2w64-libwinpthread-git   5.0.0.4634.697f757               2
markupsafe                2.0.1            py38h2bbff1b_0
menuinst                  1.4.16           py38he774522_1
mistune                   0.8.4           py38he774522_1000
mkl                       2021.2.0           haa95532_296
mkl-service               2.3.0            py38h2bbff1b_1
mkl_fft                   1.3.0            py38h277e83a_2
mkl_random                1.2.1            py38hf11a4ad_2
mpmath                    1.2.1            py38haa95532_0
msys2-conda-epoch         20160418                      1
nbclassic                 0.2.6              pyhd3eb1b0_0
nbclient                  0.5.3              pyhd3eb1b0_0
nbconvert                 6.0.7                    py38_0
nbformat                  5.1.3              pyhd3eb1b0_0
nest-asyncio              1.5.1              pyhd3eb1b0_0
notebook                  6.4.0            py38haa95532_0
numpy                     1.20.2           py38ha4e8547_0
numpy-base                1.20.2           py38hc2deb75_0
openssl                   1.1.1k               h2bbff1b_0
packaging                 20.9               pyhd3eb1b0_0
pandoc                    2.12                 haa95532_0
pandocfilters             1.4.3            py38haa95532_1
parso                     0.8.2              pyhd3eb1b0_0
pickleshare               0.7.5           pyhd3eb1b0_1003
pip                       20.2.4           py38haa95532_0
powershell_shortcut       0.0.1                         3
prometheus_client         0.10.1             pyhd3eb1b0_0
prompt-toolkit            3.0.17             pyh06a4308_0
prompt_toolkit            3.0.17               hd3eb1b0_0
pycosat                   0.6.3            py38h2bbff1b_0
pycparser                 2.20                       py_2
pygments                  2.9.0              pyhd3eb1b0_0
pyopenssl                 19.1.0             pyhd3eb1b0_1
pyparsing                 2.4.7              pyhd3eb1b0_0
pyqt                      5.9.2            py38ha925a31_4
pyrsistent                0.17.3           py38he774522_0
pysocks                   1.7.1            py38haa95532_0
python                    3.8.5                h5fd99cc_1
python-dateutil           2.8.1              pyhd3eb1b0_0
pytz                      2021.1             pyhd3eb1b0_0
pywin32                   227              py38he774522_1
pywinpty                  0.5.7                    py38_0
pyzmq                     20.0.0           py38hd77b12b_1
qt                        5.9.7            vc14h73c81de_0
qtconsole                 5.0.3              pyhd3eb1b0_0
qtpy                      1.9.0                      py_0
requests                  2.24.0                     py_0
ruamel_yaml               0.15.87          py38he774522_1
send2trash                1.5.0              pyhd3eb1b0_1
setuptools                50.3.1           py38haa95532_1
sip                       4.19.13          py38ha925a31_0
six                       1.15.0           py38haa95532_0
sniffio                   1.2.0            py38haa95532_1
sqlite                    3.33.0               h2a8f88b_0
sympy                     1.8              py38haa95532_0
terminado                 0.9.4            py38haa95532_0
testpath                  0.4.4              pyhd3eb1b0_0
tornado                   6.1              py38h2bbff1b_0
tqdm                      4.51.0             pyhd3eb1b0_0
traitlets                 5.0.5              pyhd3eb1b0_0
urllib3                   1.25.11                    py_0
vc                        14.1                 h0510ff6_4
vs2015_runtime            14.16.27012          hf0eaf9b_3
wcwidth                   0.2.5                      py_0
webencodings              0.5.1                    py38_1
wheel                     0.35.1             pyhd3eb1b0_0
widgetsnbextension        3.5.1                    py38_0
win_inet_pton             1.1.0            py38haa95532_0
wincertstore              0.2                      py38_0
winpty                    0.4.3                         4
yaml                      0.2.5                he774522_0
zeromq                    4.3.3                ha925a31_3
zipp                      3.4.1              pyhd3eb1b0_0
zlib                      1.2.11               h62dcd97_4

[jamblejoe]

I checked quickly on my notebook which is running Windows 10 Enterprise 20H2. In WSL 2 Ubuntu 20.04 I get

julia> import PyCall

julia> const sympy = PyCall.pyimport_conda("sympy", "sympy")
PyObject <module 'sympy' from '/home/goran/.julia/conda/3/lib/python3.8/site-packages/sympy/__init__.py'>

julia> a = sympy.symbols("a")
PyObject a

julia> p = sympy.Poly(a^2 + 3*a -2, a)
PyObject Poly(a**2 + 3*a - 2, a, domain='ZZ')

julia> for i in 0:2; @show p.coeff_monomial(a^i); end
p.coeff_monomial(a ^ i) = PyObject -2
p.coeff_monomial(a ^ i) = PyObject 3
p.coeff_monomial(a ^ i) = PyObject 1

julia> Threads.@threads for i in 0:2; @show p.coeff_monomial(a^i); end

signal (11): Segmentation fault
p.coeff_monomial(a ^ i) = in expression starting at REPL[16]:1
PyObject 1
_PyObject_Malloc at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyObject_GC_New at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
PyCell_New at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalCodeWithName at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyFunction_Vectorcall at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
call_function.lto_priv.1695 at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalFrameDefault at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalCodeWithName at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyFunction_Vectorcall at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
call_function.lto_priv.1695 at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalFrameDefault at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyEval_EvalCodeWithName at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyFunction_Vectorcall at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
_PyObject_FastCall_Prepend at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
call_maybe.constprop.104 at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
slot_nb_power.lto_priv.1956 at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
ternary_op.isra.40.lto_priv.2161 at /home/goran/.julia/conda/3/lib/libpython3.8.so.1.0 (unknown line)
macro expansion at /home/goran/.julia/packages/PyCall/BD546/src/exception.jl:95 [inlined]
^ at /home/goran/.julia/packages/PyCall/BD546/src/pyoperators.jl:18 [inlined]
^ at /home/goran/.julia/packages/PyCall/BD546/src/pyoperators.jl:21
unknown function (ip: 0x7f553c055265)
_jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2237 [inlined]
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2419
macro expansion at ./show.jl:955 [inlined]
macro expansion at ./REPL[16]:1 [inlined]
#23#threadsfor_fun at ./threadingconstructs.jl:81
#23#threadsfor_fun at ./threadingconstructs.jl:48
unknown function (ip: 0x7f553c05a64c)
_jl_invoke at /buildworker/worker/package_linux64/build/src/gf.c:2237 [inlined]
jl_apply_generic at /buildworker/worker/package_linux64/build/src/gf.c:2419
jl_apply at /buildworker/worker/package_linux64/build/src/julia.h:1703 [inlined]
start_task at /buildworker/worker/package_linux64/build/src/task.c:839
unknown function (ip: (nil))
Allocations: 13590751 (Pool: 13585686; Big: 5065); GC: 17
Segmentation fault (core dumped)

julia> versioninfo()
Julia Version 1.6.1
Commit 6aaedecc44 (2021-04-23 05:59 UTC)
Platform Info:
  OS: Linux (x86_64-pc-linux-gnu)
  CPU: Intel(R) Core(TM) i7-8665U CPU @ 1.90GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-11.0.1 (ORCJIT, skylake)

julia>

julia> Conda.list()
[ Info: Running `conda list` in root environment
# packages in environment at /home/goran/.julia/conda/3:
#
# Name                    Version                   Build  Channel
_libgcc_mutex             0.1                        main
anyio                     2.2.0            py38h06a4308_1
argon2-cffi               20.1.0           py38h27cfd23_1
async_generator           1.10               pyhd3eb1b0_0
attrs                     21.2.0             pyhd3eb1b0_0
babel                     2.9.1              pyhd3eb1b0_0
backcall                  0.2.0              pyhd3eb1b0_0
blas                      1.0                         mkl
bleach                    3.3.0              pyhd3eb1b0_0
brotlipy                  0.7.0           py38h27cfd23_1003
ca-certificates           2021.4.13            h06a4308_1
certifi                   2020.12.5        py38h06a4308_0
cffi                      1.14.5           py38h261ae71_0
chardet                   4.0.0           py38h06a4308_1003
conda                     4.10.1           py38h06a4308_1
conda-package-handling    1.7.3            py38h27cfd23_1
cryptography              3.4.7            py38hd23ed53_0
cycler                    0.10.0                   py38_0
dbus                      1.13.18              hb2f20db_0
decorator                 5.0.9              pyhd3eb1b0_0
defusedxml                0.7.1              pyhd3eb1b0_0
entrypoints               0.3                      py38_0
expat                     2.4.1                h2531618_2
fontconfig                2.13.1               h6c09931_0
freetype                  2.10.4               h5ab3b9f_0
glib                      2.68.2               h36276a3_0
gmp                       6.2.1                h2531618_2
gmpy2                     2.0.8            py38hd5f6e3b_3
gst-plugins-base          1.14.0               h8213a91_2
gstreamer                 1.14.0               h28cd5cc_2
icu                       58.2                 he6710b0_3
idna                      2.10               pyhd3eb1b0_0
importlib-metadata        3.10.0           py38h06a4308_0
importlib_metadata        3.10.0               hd3eb1b0_0
intel-openmp              2021.2.0           h06a4308_610
ipykernel                 5.3.4            py38h5ca1d4c_0
ipython                   7.22.0           py38hb070fc8_0
ipython_genutils          0.2.0              pyhd3eb1b0_1
ipywidgets                7.6.3              pyhd3eb1b0_1
jedi                      0.17.0                   py38_0
jinja2                    3.0.0              pyhd3eb1b0_0
jpeg                      9b                   h024ee3a_2
json5                     0.9.5                      py_0
jsonschema                3.2.0                      py_2
jupyter                   1.0.0                    py38_7
jupyter-packaging         0.7.12             pyhd3eb1b0_0
jupyter_client            6.1.12             pyhd3eb1b0_0
jupyter_console           6.4.0              pyhd3eb1b0_0
jupyter_core              4.7.1            py38h06a4308_0
jupyter_server            1.4.1            py38h06a4308_0
jupyterlab                2.3.1              pyhd3eb1b0_0
jupyterlab_pygments       0.1.2                      py_0
jupyterlab_server         1.2.0                      py_0
jupyterlab_widgets        1.0.0              pyhd3eb1b0_1
kiwisolver                1.3.1            py38h2531618_0
lcms2                     2.12                 h3be6417_0
ld_impl_linux-64          2.33.1               h53a641e_7
libffi                    3.3                  he6710b0_2
libgcc-ng                 9.1.0                hdf63c60_0
libpng                    1.6.37               hbc83047_0
libsodium                 1.0.18               h7b6447c_0
libstdcxx-ng              9.1.0                hdf63c60_0
libtiff                   4.1.0                h2733197_1
libuuid                   1.0.3                h1bed415_2
libxcb                    1.14                 h7b6447c_0
libxml2                   2.9.10               hb55368b_3
lz4-c                     1.9.3                h2531618_0
markupsafe                2.0.1            py38h27cfd23_0
matplotlib                3.3.4            py38h06a4308_0
matplotlib-base           3.3.4            py38h62a2d02_0
mistune                   0.8.4           py38h7b6447c_1000
mkl                       2021.2.0           h06a4308_296
mkl-service               2.3.0            py38h27cfd23_1
mkl_fft                   1.3.0            py38h42c9631_2
mkl_random                1.2.1            py38ha9443f7_2
mpc                       1.1.0                h10f8cd9_1
mpfr                      4.0.2                hb69a4c5_1
mpmath                    1.2.1            py38h06a4308_0
nbclassic                 0.2.6              pyhd3eb1b0_0
nbclient                  0.5.3              pyhd3eb1b0_0
nbconvert                 6.0.7                    py38_0
nbformat                  5.1.3              pyhd3eb1b0_0
ncurses                   6.2                  he6710b0_1
nest-asyncio              1.5.1              pyhd3eb1b0_0
nodejs                    12.4.0               he1b5a44_0    conda-forge
notebook                  6.4.0            py38h06a4308_0
numpy                     1.20.2           py38h2d18471_0
numpy-base                1.20.2           py38hfae3a4d_0
olefile                   0.46                       py_0
openssl                   1.1.1k               h27cfd23_0
packaging                 20.9               pyhd3eb1b0_0
pandoc                    2.12                 h06a4308_0
pandocfilters             1.4.3            py38h06a4308_1
parso                     0.8.2              pyhd3eb1b0_0
pcre                      8.44                 he6710b0_0
pexpect                   4.8.0              pyhd3eb1b0_3
pickleshare               0.7.5           pyhd3eb1b0_1003
pillow                    8.2.0            py38he98fc37_0
pip                       21.1.1           py38h06a4308_0
prometheus_client         0.10.1             pyhd3eb1b0_0
prompt-toolkit            3.0.17             pyh06a4308_0
prompt_toolkit            3.0.17               hd3eb1b0_0
ptyprocess                0.7.0              pyhd3eb1b0_2
pycosat                   0.6.3            py38h7b6447c_1
pycparser                 2.20                       py_2
pygments                  2.9.0              pyhd3eb1b0_0
pyopenssl                 20.0.1             pyhd3eb1b0_1
pyparsing                 2.4.7              pyhd3eb1b0_0
pyqt                      5.9.2            py38h05f1152_4
pyrsistent                0.17.3           py38h7b6447c_0
pysocks                   1.7.1            py38h06a4308_0
python                    3.8.10               hdb3f193_7
python-dateutil           2.8.1              pyhd3eb1b0_0
python_abi                3.8                      1_cp38    conda-forge
pytz                      2021.1             pyhd3eb1b0_0
pyzmq                     20.0.0           py38h2531618_1
qt                        5.9.7                h5867ecd_1
qtconsole                 5.0.3              pyhd3eb1b0_0
qtpy                      1.9.0                      py_0
readline                  8.1                  h27cfd23_0
requests                  2.25.1             pyhd3eb1b0_0
ruamel_yaml               0.15.100         py38h27cfd23_0
send2trash                1.5.0              pyhd3eb1b0_1
setuptools                52.0.0           py38h06a4308_0
sip                       4.19.13          py38he6710b0_0
six                       1.15.0           py38h06a4308_0
sniffio                   1.2.0            py38h06a4308_1
sqlite                    3.35.4               hdfb4753_0
sympy                     1.8              py38h06a4308_0
terminado                 0.9.4            py38h06a4308_0
testpath                  0.4.4              pyhd3eb1b0_0
tk                        8.6.10               hbc83047_0
tornado                   6.1              py38h27cfd23_0
tqdm                      4.59.0             pyhd3eb1b0_1
traitlets                 5.0.5              pyhd3eb1b0_0
urllib3                   1.26.4             pyhd3eb1b0_0
wcwidth                   0.2.5                      py_0
webencodings              0.5.1                    py38_1
wheel                     0.36.2             pyhd3eb1b0_0
widgetsnbextension        3.5.1                    py38_0
xz                        5.2.5                h7b6447c_0
yaml                      0.2.5                h7b6447c_0
zeromq                    4.3.4                h2531618_0
zipp                      3.4.1              pyhd3eb1b0_0
zlib                      1.2.11               h7b6447c_3
zstd                      1.4.9                haebb681_0

While on the host OS I get

julia> import PyCall

julia> const sympy = PyCall.pyimport_conda("sympy", "sympy")
PyObject <module 'sympy' from 'C:\\Users\\gnakerst\\.julia\\conda\\3\\lib\\site-packages\\sympy\\__init__.py'>

julia> a = sympy.symbols("a")
PyObject a

julia> p = sympy.Poly(a^2 + 3*a -2, a)
PyObject Poly(a**2 + 3*a - 2, a, domain='ZZ')

julia> for i in 0:2; @show p.coeff_monomial(a^i); end
p.coeff_monomial(a ^ i) = PyObject -2
p.coeff_monomial(a ^ i) = PyObject 3
p.coeff_monomial(a ^ i) = PyObject 1

julia> Threads.@threads for i in 0:2; @show p.coeff_monomial(a^i); end
ERROR: TaskFailedException
Stacktrace:
 [1] wait
   @ .\task.jl:317 [inlined]
 [2] threading_run(func::Function)
   @ Base.Threads .\threadingconstructs.jl:34
 [3] top-level scope
   @ .\threadingconstructs.jl:93

    nested task error: $(Expr(:escape, :(ccall(#= C:\Users\gnakerst\.julia\packages\PyCall\BD546\src\pyfncall.jl:43 =# @pysym(:PyObject_Call), PyPtr, (PyPtr, PyPtr, PyPtr), o, pyargsptr, kw)))) failed
    Stacktrace:
     [1] error(::String, ::String)
       @ Base .\error.jl:42
     [2] _handle_error(msg::String)
       @ PyCall ~\.julia\packages\PyCall\BD546\src\exception.jl:84

julia> Conda.list()
[ Info: Running `conda list` in root environment
# packages in environment at C:\Users\gnakerst\.julia\conda\3:
#
# Name                    Version                   Build  Channel
anyio                     2.2.0            py38haa95532_1
argon2-cffi               20.1.0           py38h2bbff1b_1
async_generator           1.10               pyhd3eb1b0_0
attrs                     20.3.0             pyhd3eb1b0_0
babel                     2.9.0              pyhd3eb1b0_0
backcall                  0.2.0              pyh9f0ad1d_0    conda-forge
backports                 1.0                        py_2    conda-forge
backports.functools_lru_cache 1.6.1                      py_0    conda-forge
blas                      1.0                         mkl
bleach                    3.3.0              pyhd3eb1b0_0
brotlipy                  0.7.0           py38he774522_1000
ca-certificates           2021.4.13            haa95532_1
certifi                   2020.12.5        py38haa95532_0
cffi                      1.14.2           py38h7a1dbc1_0
chardet                   3.0.4                 py38_1003
colorama                  0.4.4              pyh9f0ad1d_0    conda-forge
conda                     4.10.1           py38haa95532_1
conda-package-handling    1.6.1            py38h62dcd97_0
console_shortcut          0.1.1                         4
cryptography              3.1              py38h7a1dbc1_0
cycler                    0.10.0                   py38_0
cython                    0.29.22                  pypi_0    pypi
decorator                 4.4.2                      py_0    conda-forge
defusedxml                0.7.1              pyhd3eb1b0_0
dill                      0.3.3                    pypi_0    pypi
dlx                       1.0.4                    pypi_0    pypi
docplex                   2.15.194                 pypi_0    pypi
entrypoints               0.3                      py38_0
fastcache                 1.1.0            py38he774522_0
fastdtw                   0.3.4                    pypi_0    pypi
fastjsonschema            2.15.0                   pypi_0    pypi
freetype                  2.10.2               hd328e21_0
h5py                      3.2.1                    pypi_0    pypi
icu                       58.2                 ha925a31_3
idna                      2.10                       py_0
importlib-metadata        3.10.0           py38haa95532_0
importlib_metadata        3.10.0               hd3eb1b0_0
inflection                0.5.1                    pypi_0    pypi
intel-openmp              2020.2                      254
ipykernel                 5.5.0                    pypi_0    pypi
ipython                   7.21.0           py38hc5df569_0    conda-forge
ipython-genutils          0.2.0                    pypi_0    pypi
ipython_genutils          0.2.0                      py_1    conda-forge
jedi                      0.18.0           py38haa244fe_2    conda-forge
jinja2                    2.11.3             pyhd3eb1b0_0
joblib                    1.0.1                    pypi_0    pypi
jpeg                      9b                   hb83a4c4_2
json5                     0.9.5                      py_0
jsonschema                3.2.0                      py_2
jupyter-client            6.1.11                   pypi_0    pypi
jupyter-packaging         0.7.12             pyhd3eb1b0_0
jupyter_client            6.1.12             pyhd3eb1b0_0
jupyter_core              4.7.1            py38haa244fe_0    conda-forge
jupyter_server            1.4.1            py38haa95532_0
jupyterlab                3.0.11             pyhd3eb1b0_1
jupyterlab_pygments       0.1.2                      py_0
jupyterlab_server         2.4.0              pyhd3eb1b0_0
jupyterthemes             0.20.0                     py_1    conda-forge
kiwisolver                1.2.0            py38h74a9793_0
lesscpy                   0.13.0                     py_1    conda-forge
libpng                    1.6.37               h2a8f88b_0
libsodium                 1.0.18               h62dcd97_0
libtiff                   4.1.0                h56a325e_1
lxml                      4.6.2                    pypi_0    pypi
lz4-c                     1.9.2                h62dcd97_1
m2w64-gcc-libgfortran     5.3.0                         6
m2w64-gcc-libs            5.3.0                         7
m2w64-gcc-libs-core       5.3.0                         7
m2w64-gmp                 6.1.0                         2
m2w64-libwinpthread-git   5.0.0.4634.697f757               2
markupsafe                1.1.1            py38he774522_0
matplotlib                3.3.1                         0
matplotlib-base           3.3.1            py38hba9282a_0
menuinst                  1.4.16           py38he774522_0
mistune                   0.8.4           py38he774522_1000
mkl                       2020.2                      256
mkl-service               2.3.0            py38hb782905_0
mkl_fft                   1.1.0            py38h45dec08_0
mkl_random                1.1.1            py38h47e9c7a_0
more-itertools            8.7.0                    pypi_0    pypi
mpmath                    1.1.0                    py38_0
msys2-conda-epoch         20160418                      1
multitasking              0.0.9                    pypi_0    pypi
nbclassic                 0.2.6              pyhd3eb1b0_0
nbclient                  0.5.3              pyhd3eb1b0_0
nbconvert                 6.0.7                    py38_0
nbformat                  5.1.3              pyhd3eb1b0_0
nest-asyncio              1.5.1              pyhd3eb1b0_0
networkx                  2.5                      pypi_0    pypi
nodejs                    14.8.0               hd77b12b_0
notebook                  6.3.0            py38haa95532_0
ntlm-auth                 1.5.0                    pypi_0    pypi
numpy                     1.19.1           py38h5510c5b_0
numpy-base                1.19.1           py38ha3acd2a_0
olefile                   0.46                       py_0
openssl                   1.1.1k               h2bbff1b_0
packaging                 20.9               pyhd3eb1b0_0
pandas                    1.2.3                    pypi_0    pypi
pandoc                    2.12                 haa95532_0
pandocfilters             1.4.3            py38haa95532_1
parso                     0.8.1              pyhd8ed1ab_0    conda-forge
pickleshare               0.7.5                   py_1003    conda-forge
pillow                    7.2.0            py38hcc1f983_0
pip                       20.2.2                   py38_0
ply                       3.11                     pypi_0    pypi
powershell_shortcut       0.0.1                         3
prometheus_client         0.10.1             pyhd3eb1b0_0
prompt-toolkit            3.0.17             pyha770c72_0    conda-forge
psutil                    5.8.0                    pypi_0    pypi
pybind11                  2.6.2                    pypi_0    pypi
pycosat                   0.6.3            py38he774522_0
pycparser                 2.20                       py_2
pyglet                    1.5.11                   pypi_0    pypi
pygments                  2.8.1              pyhd8ed1ab_0    conda-forge
pyopenssl                 19.1.0                     py_1
pyparsing                 2.4.7                      py_0
pyqt                      5.9.2            py38ha925a31_4
pyrsistent                0.17.3           py38he774522_0
pysocks                   1.7.1                    py38_0
python                    3.8.5                h5fd99cc_1
python-constraint         1.4.0                    pypi_0    pypi
python-dateutil           2.8.1                      py_0
python_abi                3.8                      1_cp38    conda-forge
pytz                      2021.1             pyhd3eb1b0_0
pywin32                   227              py38he774522_1
pywinpty                  0.5.7                    py38_0
pyzmq                     22.0.3                   pypi_0    pypi
qiskit                    0.24.0                   pypi_0    pypi
qiskit-aer                0.7.6                    pypi_0    pypi
qiskit-aqua               0.8.2                    pypi_0    pypi
qiskit-ibmq-provider      0.12.1                   pypi_0    pypi
qiskit-ignis              0.5.2                    pypi_0    pypi
qiskit-terra              0.16.4                   pypi_0    pypi
qt                        5.9.7            vc14h73c81de_0
quandl                    3.6.1                    pypi_0    pypi
requests                  2.24.0                     py_0
requests-ntlm             1.1.0                    pypi_0    pypi
retworkx                  0.8.0                    pypi_0    pypi
ruamel_yaml               0.15.87          py38he774522_1
scikit-learn              0.24.1                   pypi_0    pypi
scipy                     1.6.1                    pypi_0    pypi
send2trash                1.5.0              pyhd3eb1b0_1
setuptools                49.6.0                   py38_0
sip                       4.19.13          py38ha925a31_0
six                       1.15.0                     py_0
sniffio                   1.2.0            py38haa95532_1
sqlite                    3.33.0               h2a8f88b_0
sympy                     1.6.2            py38haa95532_1
terminado                 0.9.4            py38haa95532_0
testpath                  0.4.4              pyhd3eb1b0_0
threadpoolctl             2.1.0                    pypi_0    pypi
tk                        8.6.10               he774522_0
tornado                   6.1              py38h2bbff1b_0
tqdm                      4.48.2                     py_0
traitlets                 5.0.5                      py_0    conda-forge
urllib3                   1.25.10                    py_0
vc                        14.1                 h0510ff6_4
vs2015_runtime            14.16.27012          hf0eaf9b_3
wcwidth                   0.2.5              pyh9f0ad1d_2    conda-forge
webencodings              0.5.1                    py38_1
websockets                8.1                      pypi_0    pypi
wheel                     0.35.1                     py_0
win_inet_pton             1.1.0                    py38_0
wincertstore              0.2                      py38_0
winpty                    0.4.3                         4
xz                        5.2.5                h62dcd97_0
yaml                      0.2.5                he774522_0
yfinance                  0.1.55                   pypi_0    pypi
zeromq                    4.3.3                ha925a31_3
zipp                      3.4.1              pyhd3eb1b0_0
zlib                      1.2.11               h62dcd97_4
zstd                      1.4.5                h04227a9_0

julia> versioninfo()
Julia Version 1.6.0
Commit f9720dc2eb (2021-03-24 12:55 UTC)
Platform Info:
  OS: Windows (x86_64-w64-mingw32)
  CPU: Intel(R) Core(TM) i7-8665U CPU @ 1.90GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-11.0.1 (ORCJIT, skylake)

julia>

[jverzani]

Yeah, my guess is this is something to report to PyCall. From skimming over JuliaPy/PyCall.jl#882 it seems like a known area for improvement.

[jamblejoe]

That looks relevant. Thanks! So we have to wait until JuliaPy/PyCall.jl#882 is solved and then check again.