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Document of [BufferedIOBase](https://docs.python.org/3/library/io.html#io.BufferedIOBase) says:
> ...unlike their RawIOBase counterparts, they will never return None.
But this example shows the above statement is not true:
 import io
 import os
 import sys
 os.set_blocking(sys.stdin.fileno(), False)
 print(isinstance(sys.stdin.buffer, io.BufferedIOBase))
 print(sys.stdin.buffer.read())
Output:
 True
 None

The general problem of non-blocking reads with BufferedIOBase is covered by Issue 13322. The documentation and implementations do not agree. I suggest to not rely on any particular behaviour reading BufferedIOBase objects in non-blocking mode.
The problem of the concrete class BufferedReader (what "stdin.buffer" usually is) was also recently raised in Issue 35869.