[issue22773] Export Readline version and expect ANSI sequence for version < 0x6000

[STINNER Victor]

STINNER Victor added the comment:

In the past, I added sys.thread_info to be able to skip tests on some old platforms. Maybe we need something similar: an object with runtime version, build version, implementation name, etc.

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<http://bugs.python.org/issue22773>
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