Error in atexit._run_exitfuncs: wx._core.wxAssertionError: C++ assertion "GetEventHandler() == this" failed at ..\..\src\common\wincmn.cpp(474) in wxWindowBase::~wxWindowBase(): any pushed event handlers must have been removed

[Cruyi]

wx._core.wxAssertionError: C++ assertion "CheckSizerFlags(!((flags) & (wxALIGN_RIGHT | wxALIGN_CENTRE_HORIZONTAL | wxALIGN_BOTTOM | wxALIGN_CENTRE_VERTICAL)))" failed at ....\src\common\sizer.cpp(2294) in wxBoxSizer::DoInsert(): wxALIGN_RIGHT | wxALIGN_CENTRE_HORIZONTAL | wxALIGN_BOTTOM | wxALIGN_CENTRE_VERTICAL will be ignored in this sizer: wxEXPAND overrides alignment flags in box sizers

DO NOT PANIC !!

If you're an end user running a program not developed by you, please ignore this message, it is harmless, and please try reporting the problem to the program developers.

You may also set WXSUPPRESS_SIZER_FLAGS_CHECK environment variable to suppress all such checks when running this program.

If you're the developer, simply remove this flag from your code to avoid getting this message. You can also call wxSizerFlags::DisableConsistencyChecks() to globally disable all such checks, but this is strongly not recommended.
Error in atexit._run_exitfuncs:
wx._core.wxAssertionError: C++ assertion "GetEventHandler() == this" failed at ....\src\common\wincmn.cpp(474) in wxWindowBase::~wxWindowBase(): any pushed event handlers must have been removed

[lonelybuffer]

I have the same problem. Do you solve it?

[lonelybuffer]

I changed the wxPython version to 4.0.7.post2, then it worked.
pip install wxPython==4.0.7.post2