Steve Dower added the comment:

As near as I can tell, Py_Initialize() is causing the stdout mode to change 
from O_TEXT to O_BINARY in _testembed.

Looking at the output in this test, you can see the first printf('\n') (after 
'Use defaults') is correctly translated, but the next '\n' comes after 
Py_Initialize().

b'--- Use defaults ---\r\n... \r\n--- Set encoding only ---\n...'

I don't really see how this can be avoided without breaking something else to 
do with text IO. Probably the documentation for Py_Initialize should get the 
note, rather than the What's New section. Py_Initialize has really brief docs, 
and I'm certain there are plenty of other little things like this that change 
when you call it - is this the right place for compiler-specific caveats like 
this? I don't really know where else it could go. Or is it something that we 
really do want to fix? (We generally avoid changing global settings like this 
where possible.)

----------
status: closed -> open

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue22731>
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