ImportError: No module named _bootlocale with Python 3.10

[Giovanni Allegri]

I've just updated to Python 3.10.0 for Windows.

A quick test of PyInstaller resulted in the followign error:

3842 INFO: distutils: retargeting to non-venv dir '<hidden-path>\\Python310\\lib'

Traceback (most recent call last):

  File "<hidden-path>\Python310\lib\runpy.py", line 196, in _run_module_as_main

    return _run_code(code, main_globals, None,

  File "<hidden-path>\Python310\lib\runpy.py", line 86, in _run_code

    exec(code, run_globals)

  File "<hidden-path>\Python310\Scripts\pyinstaller.exe\__main__.py", line 7, in <module>

  File "<hidden-path>\Python310\lib\site-packages\PyInstaller\__main__.py", line 126, in run

    run_build(pyi_config, spec_file, **vars(args))

  File "<hidden-path>\Python310\lib\site-packages\PyInstaller\__main__.py", line 65, in run_build

    PyInstaller.building.build_main.main(pyi_config, spec_file, **kwargs)

  File "<hidden-path>\Python310\lib\site-packages\PyInstaller\building\build_main.py", line 815, in main

    build(specfile, kw.get('distpath'), kw.get('workpath'), kw.get('clean_build'))

  File "<hidden-path>\Python310\lib\site-packages\PyInstaller\building\build_main.py", line 762, in build

    exec(code, spec_namespace)

  File "D:\dev\python\oscbridge\app.spec", line 7, in <module>

    a = Analysis(['app.py'],

  File "<hidden-path>\Python310\lib\site-packages\PyInstaller\building\build_main.py", line 294, in __init__

    self.__postinit__()

  File "<hidden-path>\Python310\lib\site-packages\PyInstaller\building\datastruct.py", line 159, in __postinit__

    self.assemble()

  File "<hidden-path>\Python310\lib\site-packages\PyInstaller\building\build_main.py", line 394, in assemble

    self.graph = initialize_modgraph(

  File "<hidden-path>\Python310\lib\site-packages\PyInstaller\depend\analysis.py", line 882, in initialize_modgraph

    graph = PyiModuleGraph(

  File "<hidden-path>\Python310\lib\site-packages\PyInstaller\depend\analysis.py", line 122, in __init__

    self._analyze_base_modules()

  File "<hidden-path>\Python310\lib\site-packages\PyInstaller\depend\analysis.py", line 289, in _analyze_base_modules

    self._base_modules = [mod

  File "<hidden-path>\Python310\lib\site-packages\PyInstaller\depend\analysis.py", line 291, in <listcomp>

    for mod in self.import_hook(req)]

  File "<hidden-path>\Python310\lib\site-packages\PyInstaller\lib\modulegraph\modulegraph.py", line 1505, in import_hook

    target_package, target_module_partname = self._find_head_package(

  File "<hidden-path>\Python310\lib\site-packages\PyInstaller\lib\modulegraph\modulegraph.py", line 1711, in _find_head_package

    raise ImportError("No module named " + target_package_name)

ImportError: No module named _bootlocale

I've found this post https://bugzilla.redhat.com/show_bug.cgi?id=1899950 where (if I understand correcly) _bootlocale was removed from Python 3.10.0.

I can jump back to Python 3.9.0 for the moment but I guess this change will have to be managed inside PyInstaller.

Giovanni