Why does pyinstaller generated exe fail with module not found giving a strange module name?

Question

I am running pyinstaller 6.8.0 on Windows 10

my application runs correctly when called from the terminal (python .../main.py)

I can build it using pyinstaller with no error messages

When I run the exe it fails with the error

File "psiconfig\toml_config.py", line 2, in ModuleNotFoundError: No module named '3c22db458360489351e4__mypyc'

Line 2 of tomli_config,py is:

import toml

If I run python REPL I am able to import tomli with no errors

this is my spec file

# -*- mode: python ; coding: utf-8 -*-


a = Analysis(
    ['C:\\Users\\jeffw\\projects\\basic_app\\basic_app\\src\\main.py'],
    pathex=[],
    binaries=[],
    datas=[('basic_app/images/icon.png', 'images')],
    hiddenimports=['tomli'],
    hookspath=[],
    hooksconfig={},
    runtime_hooks=[],
    excludes=[],
    noarchive=False,
    optimize=0,
)
pyz = PYZ(a.pure)

exe = EXE(
    pyz,
    a.scripts,
    a.binaries,
    a.datas,
    [],
    name='BasicApp.exe',
    debug=False,
    bootloader_ignore_signals=False,
    strip=False,
    upx=True,
    upx_exclude=[],
    runtime_tmpdir=None,
    console=False,
    disable_windowed_traceback=False,
    argv_emulation=False,
    target_arch=None,
    codesign_identity=None,
    entitlements_file=None,
    icon=['basic_app\\images\\icon.ico'],
)

How do I solve this?

Answer 1

Having no response to my question I have given up. I only use a subset of toml and so I wrote the functionality myself and dumped tomli and tomli_w from the project.

It now works