SymPy cannot be loaded properly after updating the Julia to a new version #511

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1. jverzani commented on Jun 28, 2023

   

   jverzani

   on Jun 28, 2023

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   I'm no expert, but it looks like your python isn't full configured. Can you try this?

   using PyCall
   sympy = pyimport_conda("sympy", "sympy")
   sympy.sin
   

   My guess is either the first or second line is going to be an issue, and my guess is the first.
2. songhanzhang commented on Jul 18, 2023

   

   songhanzhang

   on Jul 18, 2023

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   I'm no expert, but it looks like your python isn't full configured. Can you try this?

   using PyCall
   sympy = pyimport_conda("sympy", "sympy")
   sympy.sin
   

   My guess is either the first or second line is going to be an issue, and my guess is the first.

   Thanks for your response! Yes, your prediction is exactly correct. However, I never changed the Python configurations (as I never use Python) except for updating the Julia version.

   julia> using PyCall
   Python path configuration:
   PYTHONHOME = '/Users/songhan.zhang/.julia/conda/3:/Users/songhan.zhang/.julia/conda/3'
   PYTHONPATH = (not set)
   program name = '/Users/songhan.zhang/.julia/conda/3/bin/python'
   isolated = 0
   environment = 1
   user site = 1
   import site = 1
   sys._base_executable = '/Users/songhan.zhang/.julia/conda/3/bin/python'
   sys.base_prefix = '/Users/songhan.zhang/.julia/conda/3'
   sys.base_exec_prefix = '/Users/songhan.zhang/.julia/conda/3'
   sys.platlibdir = 'lib'
   sys.executable = '/Users/songhan.zhang/.julia/conda/3/bin/python'
   sys.prefix = '/Users/songhan.zhang/.julia/conda/3'
   sys.exec_prefix = '/Users/songhan.zhang/.julia/conda/3'
   sys.path = [
   '/Users/songhan.zhang/.julia/conda/3/lib/python310.zip',
   '/Users/songhan.zhang/.julia/conda/3/lib/python3.10',
   '/Users/songhan.zhang/.julia/conda/3/lib/python3.10/lib-dynload',
   ]
   Fatal Python error: init_fs_encoding: failed to get the Python codec of the filesystem encoding
   Python runtime state: core initialized
   ModuleNotFoundError: No module named 'encodings'

   Current thread 0x0000000203001e00 (most recent call first):
   

   Saving session...
   ...copying shared history...
   ...saving history...truncating history files...
   ...completed.

   [Process completed]
3. jverzani commented on Jul 18, 2023

   

   jverzani

   on Jul 18, 2023

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   Maybe Pkg.build("PyCall") will help here.
4. songhanzhang commented on Jul 23, 2023

   

   songhanzhang

   on Jul 23, 2023

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   Thanks for the suggestion. I have tried, but it remains not work.

   julia> Pkg.build("PyCall")
   Building Conda ─→ ~/.julia/scratchspaces/44cfe95a-1eb2-52ea-b672-e2afdf69b78f/915ebe6f0e7302693bdd8eac985797dba1d25662/build.log
   Building PyCall → ~/.julia/scratchspaces/44cfe95a-1eb2-52ea-b672-e2afdf69b78f/43d304ac6f0354755f1d60730ece8c499980f7ba/build.log

   julia> using SymPy
   [ Info: Precompiling SymPy [24249f21-da20-56a4-8eb1-6a02cf4ae2e6]
   Python path configuration:
   PYTHONHOME = '/Users/songhan.zhang/.julia/conda/3:/Users/songhan.zhang/.julia/conda/3'
   PYTHONPATH = (not set)
   program name = '/Users/songhan.zhang/.julia/conda/3/bin/python'
   isolated = 0
   environment = 1
   user site = 1
   import site = 1
   sys._base_executable = '/Users/songhan.zhang/.julia/conda/3/bin/python'
   sys.base_prefix = '/Users/songhan.zhang/.julia/conda/3'
   sys.base_exec_prefix = '/Users/songhan.zhang/.julia/conda/3'
   sys.platlibdir = 'lib'
   sys.executable = '/Users/songhan.zhang/.julia/conda/3/bin/python'
   sys.prefix = '/Users/songhan.zhang/.julia/conda/3'
   sys.exec_prefix = '/Users/songhan.zhang/.julia/conda/3'
   sys.path = [
   '/Users/songhan.zhang/.julia/conda/3/lib/python310.zip',
   '/Users/songhan.zhang/.julia/conda/3/lib/python3.10',
   '/Users/songhan.zhang/.julia/conda/3/lib/python3.10/lib-dynload',
   ]
   Fatal Python error: init_fs_encoding: failed to get the Python codec of the filesystem encoding
   Python runtime state: core initialized
   ModuleNotFoundError: No module named 'encodings'

   Current thread 0x0000000203001e00 (most recent call first):
   
   ERROR: Failed to precompile SymPy [24249f21-da20-56a4-8eb1-6a02cf4ae2e6] to "/Users/songhan.zhang/.julia/compiled/v1.9/SymPy/jl_fCdvFZ".
   Stacktrace:
   [1] error(s::String)
   @ Base ./error.jl:35
   [2] compilecache(pkg::Base.PkgId, path::String, internal_stderr::IO, internal_stdout::IO, keep_loaded_modules::Bool)
   @ Base ./loading.jl:2300
   [3] compilecache
   @ ./loading.jl:2167 [inlined]
   [4] _require(pkg::Base.PkgId, env::String)
   @ Base ./loading.jl:1805
   [5] _require_prelocked(uuidkey::Base.PkgId, env::String)
   @ Base ./loading.jl:1660
   [6] macro expansion
   @ ./loading.jl:1648 [inlined]
   [7] macro expansion
   @ ./lock.jl:267 [inlined]
   [8] require(into::Module, mod::Symbol)
   @ Base ./loading.jl:1611
5. jverzani commented on Jul 23, 2023

   

   jverzani

   on Jul 23, 2023

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   Hmm, let me try one more thing.

   Someone just asked me about registering https://github.com/jverzani/SymPyCall.jl as installing sympy was problematic for them under PyCall, but not so under PythonCall.

   You can install locally from github and see if that works for you. There are a few tests I need to fix that have bitrotted since I last looked at this, but the basic stuff is working just as expected.
6. songhanzhang commented on Oct 20, 2023

   

   songhanzhang

   on Oct 20, 2023

   Last edited by songhanzhang

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   I think the issue is indeed related to the new version Julia. The package SymPy can be loaded properly as long as I re-install the Julia using an older version 1.6.7.

   
7. jverzani commented on Oct 21, 2023

   

   jverzani

   on Oct 21, 2023

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   This problematic. I'm in the middle of changing the backend to this package. Maybe one of those works:

   SymPyPythonCall.jl might help, as the backend is PythonCall, not PyCall. People say Python package installation is easier.

   SymPyPyCall.jl will replace SymPy but for now can be installed from GitHub
8. newptcai commented on Nov 13, 2025

   

   newptcai

   on Nov 13, 2025

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   This probably should be closed since it's 2025 and SymPy.jl works fine on Julia 12.1.
9. jverzani

   closed this as completedon Nov 13, 2025