Thomas Kluyver <tho...@kluyver.me.uk> added the comment:
The 'single' option to compile() means it's run like at a REPL, calling
displayhook if it's an expression returning a value.
But warnings shouldn't go through the displayhook, as far as I know:
>>> from contextlib import redirect_stdout, redirect_stderr
>>> from io import StringIO
>>> sio = StringIO()
>>> with redirect_stderr(sio):
... exec(compile('import warnings; warnings.warn(""" \' " """)', 'dummyfile',
'single'))
...
>>> print(sio.getvalue())
__main__:1: UserWarning: ' "
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue36695>
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