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The arcadia main function (library/python/runtime_py3/main/main.c::pymain) calls Py_InitializeFromConfig() before going to the vanilla python Py_Main().
Py_InitializeFromConfig() overrides sys.prefix and sys.exec_prefix by default values ('/var/empty') and then import __res module (and importer.pxi as a part of it).
importer.pxi::_init_venv() set a proper value to sys.prefix and sys.exec_prefix attributes.
Py_Main() in turn also calls Py_InitializeFromConfig() and reset the sys attributes to their default values again.
I don't know why it was not a problem in python 3.9 but in 3.10 it is.
ref:0466de641f92d66c4f992ae12c02d8d58db397f6
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