Eryk Sun <eryk...@gmail.com> added the comment:

The limit of 512 characters is not for sys.stdin in general. It's for 
io._WindowsConsoleIO, which gets used as the raw file for non-redirected 
sys.stdin -- and opening "CON" and "CONIN$" -- if legacy mode isn't enabled. 
See bpo-41849.

----------
nosy: +eryksun
resolution:  -> duplicate
stage:  -> resolved
status: open -> closed
superseder:  -> Support reading long lines with io._WindowsConsoleIO

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<https://bugs.python.org/issue43771>
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