unable to run the basic Embedded Python example

Sat Jun 24 20:49:58 EDT 2023

Forgot to try it or not in an Apple computer, but there’s one or two apple computers in my home when I just began to learn computer science. I should try it. Because I remembered clearly, I tried it on others.

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________________________________
From: Fulian Wang <estates at hestates.org>
Sent: Saturday, June 24, 2023 7:43:56 PM
To: Dave Ohlsson <dave.ohlsson at gmail.com>; python-list at python.org <python-list at python.org>
Subject: Re: unable to run the basic Embedded Python example

I study computer science in byu.edu, we choose the 3.4.3 vision. No matter which kind of computers or windows, I needed to download it from Microsoft store. Now I can download it directly from python.org

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From: Python-list <python-list-bounces+estates=hestates.org at python.org> on behalf of Dave Ohlsson via Python-list <python-list at python.org>
Sent: Saturday, June 24, 2023 15:35
To: python-list at python.org <python-list at python.org>
Subject: unable to run the basic Embedded Python example

I cannot get the simple program
https://docs.python.org/3/extending/embedding.html#very-high-level-embedding
to work.

My environment:
* Windows 10
* Microsoft Visual Studio 2019
* Qt Creator 10.0.1 (only as an IDE)
* Python not installed

This is what I did:

1. I downloaded https://www.python.org/ftp/python/3.11.4/Python-3.11.4.tgz

2. I extracted Python-3.11.4.tgz into C:\temp\Python-3.11.4

3. I opened the "x64 Native Tools Command Prompt for VS 2019" which comes
with Microsoft Visual Studio 2019

4. In "x64 Native Tools Command Prompt for VS 2019":

**********************************************************************
** Visual Studio 2019 Developer Command Prompt v16.11.26
** Copyright (c) 2021 Microsoft Corporation
**********************************************************************
[vcvarsall.bat] Environment initialized for: 'x64'

C:\Program Files (x86)\Microsoft Visual Studio\2019\Community>cd
C:\temp\Python-3.11.4\PCbuild

C:\temp\Python-3.11.4\PCbuild>build.bat -d // <= option '-d' means "debug"
Downloading nuget...
[many lines omitted]
Build succeeded.

C:\temp\Python-3.11.4\PCbuild\pythoncore.vcxproj(578,5): warning MSB3073:
The command ""C:\Program Files\Git\cmd\git.exe" name-rev --name-only HEAD >
"C:\temp\Python-3.11.4\PCbuild\obj\311amd64_Debug\pythoncore\gitbranch.txt""
exited with code 128.
C:\temp\Python-3.11.4\PCbuild\pythoncore.vcxproj(578,5): warning MSB4181:
The "Exec" task returned false but did not log an error.
C:\temp\Python-3.11.4\PCbuild\pythoncore.vcxproj(579,5): warning MSB3073:
The command ""C:\Program Files\Git\cmd\git.exe" rev-parse --short HEAD >
"C:\temp\Python-3.11.4\PCbuild\obj\311amd64_Debug\pythoncore\gitversion.txt""
exited with code 128.
C:\temp\Python-3.11.4\PCbuild\pythoncore.vcxproj(579,5): warning MSB4181:
The "Exec" task returned false but did not log an error.
C:\temp\Python-3.11.4\PCbuild\pythoncore.vcxproj(580,5): warning MSB3073:
The command ""C:\Program Files\Git\cmd\git.exe" describe --all --always
--dirty >
"C:\temp\Python-3.11.4\PCbuild\obj\311amd64_Debug\pythoncore\gittag.txt""
exited with code 128.
C:\temp\Python-3.11.4\PCbuild\pythoncore.vcxproj(580,5): warning MSB4181:
The "Exec" task returned false but did not log an error.
    6 Warning(s)
    0 Error(s)

Time Elapsed 00:00:34.87

C:\temp\Python-3.11.4\PCbuild>

5. I copied the example
https://docs.python.org/3/extending/embedding.html#very-high-level-embedding,
unchanged, to 'C:\temp\embedded_python\main.c'.

6. I created Qt Creator project file 'C:\temp\embedded_python\
embedded_python.pro':

TEMPLATE = app
TARGET = embedded_python
SOURCES += main.c
PYTHON_DIR = C:/temp/Python-3.11.4
INCLUDEPATH += $${PYTHON_DIR}/Include
INCLUDEPATH += $${PYTHON_DIR}/PC
LIBS += $${PYTHON_DIR}/PCbuild/amd64/python311_d.lib

7. I built the project:

20:02:38: Running steps for project embedded_python...
20:02:38: Starting: "C:\Qt\6.1.3\msvc2019_64\bin\qmake.exe"
C:\temp\embedded_python\embedded_python.pro -spec win32-msvc
"CONFIG+=debug" "CONFIG-=qml_debug" "CONFIG-=qtquickcompiler"
Info: creating stash file
C:\temp\build-embedded_python-Desktop_Qt_6_1_3_MSVC2019_64bit-Debug\.qmake.stash
20:02:38: The process "C:\Qt\6.1.3\msvc2019_64\bin\qmake.exe" exited
normally.
20:02:38: Starting: "C:\Qt\Tools\QtCreator\bin\jom\jom.exe" -f
C:/temp/build-embedded_python-Desktop_Qt_6_1_3_MSVC2019_64bit-Debug/Makefile
qmake_all

jom 1.1.3 - empower your cores

20:02:38: The process "C:\Qt\Tools\QtCreator\bin\jom\jom.exe" exited
normally.
20:02:38: Starting: "C:\Qt\Tools\QtCreator\bin\jom\jom.exe"
C:\Qt\Tools\QtCreator\bin\jom\jom.exe -f Makefile.Debug
cl -c -nologo -Zc:wchar_t -FS -Zc:strictStrings -Zi -MDd -utf-8 -W3 -w44456
-w44457 -w44458 /Fddebug\embedded_python.vc.pdb -DUNICODE -D_UNICODE
-DWIN32 -D_ENABLE_EXTENDED_ALIGNED_STORAGE -DWIN64 -DQT_GUI_LIB
-DQT_CORE_LIB -I..\embedded_python -I. -I..\Python-3.11.4\Include
-I..\Python-3.11.4\PC -I..\..\Qt\6.1.3\msvc2019_64\include
-I..\..\Qt\6.1.3\msvc2019_64\include\QtGui
-I..\..\Qt\6.1.3\msvc2019_64\include\QtCore -Idebug -IC:/VulkanSDK/
1.0.51.0/Include -I..\..\Qt\6.1.3\msvc2019_64\mkspecs\win32-msvc -Fodebug\
@C:\Users\dave\AppData\Local\Temp\main.obj.21168.0.jom
main.c
..\embedded_python\main.c(12): warning C4996: 'Py_SetProgramName':
deprecated in 3.11
link /NOLOGO /DYNAMICBASE /NXCOMPAT /DEBUG /SUBSYSTEM:WINDOWS
"/MANIFESTDEPENDENCY:type='win32' name='Microsoft.Windows.Common-Controls'
version='6.0.0.0' publicKeyToken='6595b64144ccf1df' language='*'
processorArchitecture='*'" /MANIFEST:embed /OUT:debug\embedded_python.exe
@C:\Users\dave\AppData\Local\Temp\embedded_python.exe.21168.484.jom
20:02:39: The process "C:\Qt\Tools\QtCreator\bin\jom\jom.exe" exited
normally.
20:02:39: Elapsed time: 00:01.

8. So far, so good. Next, I tried to run embedded_python.exe. In order for
the Python DLL to be available:
8a. I closed Qt Creator.
8b. In the Control Panel, "System", "Advanced system settings", tab
"Advanced", "Environment Variables...", I added
'C:\temp\Python-3.11.4\PCbuild\amd64' to variable 'Path' under "User
variables for dave".
8c. I restarted Qt Creator.

9. And now, when I ran embedded_python.exe:

20:14:06: Starting
C:\temp\build-embedded_python-Desktop_Qt_6_1_3_MSVC2019_64bit-Debug\debug\embedded_python.exe...
Could not find platform independent libraries <prefix>
Python path configuration:
  PYTHONHOME = (not set)
  PYTHONPATH = (not set)
  program name =
'C:\temp\build-embedded_python-Desktop_Qt_6_1_3_MSVC2019_64bit-Debug\debug\embedded_python.exe'
  isolated = 0
  environment = 1
  user site = 1
  safe_path = 0
  import site = 1
  is in build tree = 0
  stdlib dir =
'C:\temp\build-embedded_python-Desktop_Qt_6_1_3_MSVC2019_64bit-Debug\Lib'
Fatal Python error: failed to get the Python codec of the filesystem
encoding
  sys._base_executable =
'C:\\temp\\build-embedded_python-Desktop_Qt_6_1_3_MSVC2019_64bit-Debug\\debug\\embedded_python.exe'
  sys.base_prefix =
'C:\\temp\\build-embedded_python-Desktop_Qt_6_1_3_MSVC2019_64bit-Debug'
  sys.base_exec_prefix =
'C:\\temp\\build-embedded_python-Desktop_Qt_6_1_3_MSVC2019_64bit-Debug'
  sys.platlibdir = 'DLLs'
  sys.executable =
'C:\\temp\\build-embedded_python-Desktop_Qt_6_1_3_MSVC2019_64bit-Debug\\debug\\embedded_python.exe'
  sys.prefix =
'C:\\temp\\build-embedded_python-Desktop_Qt_6_1_3_MSVC2019_64bit-Debug'
  sys.exec_prefix =
'C:\\temp\\build-embedded_python-Desktop_Qt_6_1_3_MSVC2019_64bit-Debug'
  sys.path = [
    'C:\\temp\\Python-3.11.4\\PCbuild\\amd64\\python311_d.zip',
    'C:\\temp\\build-embedded_python-Desktop_Qt_6_1_3_MSVC2019_64bit-Debug',

'C:\\temp\\build-embedded_python-Desktop_Qt_6_1_3_MSVC2019_64bit-Debug\\Lib',

'C:\\temp\\build-embedded_python-Desktop_Qt_6_1_3_MSVC2019_64bit-Debug\\debug',
  ]
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 0x00004298 (most recent call first):
  <no Python frame>
20:14:06:
C:\temp\build-embedded_python-Desktop_Qt_6_1_3_MSVC2019_64bit-Debug\debug\embedded_python.exe
exited with code 1

What am I doing wrong?
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