STINNER Victor <vstin...@python.org> added the comment:

PyPreConfig.utf8_mode=1 enables the *Python* UTF-8 Mode:
* 
https://docs.python.org/dev/c-api/init_config.html?highlight=pypreconfig_initpythonconfig#c.PyPreConfig.utf8_mode
* https://docs.python.org/dev/library/os.html#utf8-mode

> then i 'cout << u8"Chinese中文" << endl;

This is C++. C++ is not aware of the Python UTF-8 Mode.

You misunderstood the purpose of the Python UTF-8 Mode.

std::cout must be configured differently. This is not a Python problem. I 
suggest to close the issue.

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nosy: +vstinner

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