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ModuleNotFoundError: No module named 'encodings' at PythonEngine.Initialize() in Linux#2217

Closed Answeredbyzhanxh
zhanxh asked this question inQ&A
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Environment

  • Pythonnet version:2.0.21
  • Python version: 3.10.11
  • Operating System: Ubuntu 2210
  • .NET Runtime: 6.0.412

Details

  • ModuleNotFoundError: No module named 'encodings' in linux

This error occurs in virtualenv and conda, and has not been tested in other ways. (Initialized successfully in windows.)

  • error message:
/opt/miniconda3/envs/py310/lib/python310.zip;/opt/miniconda3/envs/py310/lib/python3.10;/opt/miniconda3/envs/py310/lib/python3.10/lib-dynload;/opt/miniconda3/envs/py310/lib/python3.10/site-packages;~/.local/lib/python3.10/site-packagesPython path configuration:  PYTHONHOME = '/opt/miniconda3/envs/py310/bin/python'  PYTHONPATH = (not set)  program name = 'python3'  isolated = 0  environment = 1  user site = 1  import site = 1  sys._base_executable = '/opt/miniconda3/envs/py310/bin/python3'  sys.base_prefix = ''  sys.base_exec_prefix = ''  sys.platlibdir = 'lib'  sys.executable = '/opt/miniconda3/envs/py310/bin/python3'  sys.prefix = ''  sys.exec_prefix = ''  sys.path = [    '/opt/miniconda3/envs/py310/lib/python310.zip;/opt/miniconda3/envs/py310/lib/python3.10;/opt/miniconda3/envs/py310/lib/python3.10/lib-dynload;/opt/miniconda3/envs/py310/lib/python3.10/site-packages;~/.local/lib/python3.10/site-packages',  ]Fatal Python error: init_fs_encoding: failed to get the Python codec of the filesystem encodingPython runtime state: core initializedModuleNotFoundError: No module named 'encodings'Current thread 0x00007f348e961740 (most recent call first):  <no Python frame>
  • export PYTHONPATH & run

export PYTHONPATH="/opt/miniconda3/envs/py310/lib/python310.zip;/opt/miniconda3/envs/py310/lib/python3.10;/opt/miniconda3/envs/py310/lib/python3.10/lib-dynload;/opt/miniconda3/envs/py310/lib/python3.10/site-packages;~/.local/lib/python3.10/site-packages"

  • result:
/opt/miniconda3/envs/py310/lib/python310.zip;/opt/miniconda3/envs/py310/lib/python3.10;/opt/miniconda3/envs/py310/lib/python3.10/lib-dynload;/opt/miniconda3/envs/py310/lib/python3.10/site-packages;~/.local/lib/python3.10/site-packagesPython path configuration:  PYTHONHOME = '/opt/miniconda3/envs/py310/bin/python'  PYTHONPATH = '/opt/miniconda3/envs/py310/lib/python310.zip;/opt/miniconda3/envs/py310/lib/python3.10;/opt/miniconda3/envs/py310/lib/python3.10/lib-dynload;/opt/miniconda3/envs/py310/lib/python3.10/site-packages;~/.local/lib/python3.10/site-packages'  program name = 'python3'  isolated = 0  environment = 1  user site = 1  import site = 1  sys._base_executable = '/opt/miniconda3/envs/py310/bin/python3'  sys.base_prefix = ''  sys.base_exec_prefix = ''  sys.platlibdir = 'lib'  sys.executable = '/opt/miniconda3/envs/py310/bin/python3'  sys.prefix = ''  sys.exec_prefix = ''  sys.path = [    '/opt/miniconda3/envs/py310/lib/python310.zip;/opt/miniconda3/envs/py310/lib/python3.10;/opt/miniconda3/envs/py310/lib/python3.10/lib-dynload;/opt/miniconda3/envs/py310/lib/python3.10/site-packages;~/.local/lib/python3.10/site-packages',  ]Fatal Python error: init_fs_encoding: failed to get the Python codec of the filesystem encodingPython runtime state: core initializedModuleNotFoundError: No module named 'encodings'Current thread 0x00007fe65d843740 (most recent call first):  <no Python frame>
stringwinPath=@"D:\tools\python310";stringlinuxPath="/opt/miniconda3/envs/py310";if(RuntimeInformation.IsOSPlatform(OSPlatform.Windows)){stringpathToVirtualEnv=winPath;Runtime.PythonDLL=Path.Combine(pathToVirtualEnv,"python310.dll");PythonEngine.PythonHome=Path.Combine(pathToVirtualEnv,"python.exe");PythonEngine.PythonPath=@$"{pathToVirtualEnv}\Lib\site-packages;{pathToVirtualEnv}\Lib;{pathToVirtualEnv}\DLLs";}elseif(RuntimeInformation.IsOSPlatform(OSPlatform.Linux)){//VirtualenvvarpathToVirtualEnv="/opt/miniconda3/envs/py310";Runtime.PythonDLL=$"{pathToVirtualEnv}/lib/libpython3.10.so";varpath=Environment.GetEnvironmentVariable("PATH").TrimEnd(';');path=string.IsNullOrEmpty(path)?pathToVirtualEnv:path+";"+pathToVirtualEnv;Environment.SetEnvironmentVariable("PATH",path,EnvironmentVariableTarget.Process);Environment.SetEnvironmentVariable("PATH",pathToVirtualEnv,EnvironmentVariableTarget.Process);Environment.SetEnvironmentVariable("PYTHONHOME",pathToVirtualEnv,EnvironmentVariableTarget.Process);Environment.SetEnvironmentVariable("PYTHONPATH",$"{pathToVirtualEnv}/lib/python310.zip;{pathToVirtualEnv}/lib/python3.10;{pathToVirtualEnv}/lib/python3.10/lib-dynload;{pathToVirtualEnv}/lib/python3.10/site-packages;~/.local/lib/python3.10/site-packages",EnvironmentVariableTarget.Process);varpythonpath=Environment.GetEnvironmentVariable("PYTHONPATH",EnvironmentVariableTarget.Process);;Console.WriteLine(pythonpath);PythonEngine.PythonHome=$"{pathToVirtualEnv}/bin/python";PythonEngine.PythonPath=pythonpath;}else{Console.WriteLine("This OS is not support");return;}PythonEngine.Initialize();
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Oh my god!
It's a mistake.
We must use ":" instead of ";"

            string winPath = @"D:\tools\python310";            string linuxPath = "/opt/miniconda3/envs/py310";            if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))            {                string pathToVirtualEnv = winPath;                Runtime.PythonDLL = Path.Combine(pathToVirtualEnv, "python310.dll");                PythonEngine.PythonHome = Path.Combine(pathToVirtualEnv, "python.exe");                PythonEngine.PythonPath = @$"{pathToVirtualEnv}\Lib\site-packages;{pathToVirtualEnv}\Lib;{pathToVirtualEnv}\DLLs";            }            else if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))…

Replies: 3 comments 1 reply

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The reason for not accepting the answer is that there is a question in the python environment.
Please give the correct configuration reference.
I have referred towiki

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I had a similar issue, but a completely different environment, so I'm not sure if it applies.

By default, pythonnet works with the .NET Framework environment, not core.

Instructions for loading core:
https://github.com/pythonnet/pythonnet#net-core

In my environment that alone isn't enough, because some of my dependencies could work with .NET 6 or 7, but there was no directive either way. My options were to load the .NET 7 runtuime or add in a reference to the runtimeconfig. You're running out of a .NET 6 application, so I would think the runtimeconfig.json for your app would be used?

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1 reply
@zhanxh
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PythonPath, We must use ":" instead of ";" in Linux

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Oh my god!
It's a mistake.
We must use ":" instead of ";"

            string winPath = @"D:\tools\python310";            string linuxPath = "/opt/miniconda3/envs/py310";            if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))            {                string pathToVirtualEnv = winPath;                Runtime.PythonDLL = Path.Combine(pathToVirtualEnv, "python310.dll");                PythonEngine.PythonHome = Path.Combine(pathToVirtualEnv, "python.exe");                PythonEngine.PythonPath = @$"{pathToVirtualEnv}\Lib\site-packages;{pathToVirtualEnv}\Lib;{pathToVirtualEnv}\DLLs";            }            else if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))            {                //Virtualenv                var pathToVirtualEnv = "/opt/miniconda3/envs/py310";                Runtime.PythonDLL = $"{pathToVirtualEnv}/lib/libpython3.10.so";                var path = Environment.GetEnvironmentVariable("PATH").TrimEnd(':');                path = string.IsNullOrEmpty(path) ? pathToVirtualEnv : path + ":" + pathToVirtualEnv;                Environment.SetEnvironmentVariable("PATH", path, EnvironmentVariableTarget.Process);                Environment.SetEnvironmentVariable("PATH", pathToVirtualEnv, EnvironmentVariableTarget.Process);                Environment.SetEnvironmentVariable("PYTHONHOME", pathToVirtualEnv, EnvironmentVariableTarget.Process);                Environment.SetEnvironmentVariable("PYTHONPATH", $"{pathToVirtualEnv}/lib/python3.10:{pathToVirtualEnv}/lib/python3.10/lib-dynload:{pathToVirtualEnv}/lib/python3.10/site-packages:~/.local/lib/python3.10/site-packages", EnvironmentVariableTarget.Process);                // {pathToVirtualEnv}/lib/python310.zip;                var pythonpath = Environment.GetEnvironmentVariable("PYTHONPATH", EnvironmentVariableTarget.Process); ;                Console.WriteLine(pythonpath);                PythonEngine.PythonHome = $"{pathToVirtualEnv}/bin/python";                //PythonEngine.PythonHome = $"{pathToVirtualEnv}";                PythonEngine.PythonPath = pythonpath;            }            else            {                Console.WriteLine("This OS is not support");                return;            }            PythonEngine.Initialize();
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Answer selected byzhanxh
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@zhanxh@DeniseSkidmore
Converted from issue

This discussion was converted from issue #2216 on August 09, 2023 07:01.

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