Brian Skinn <bsk...@alum.mit.edu> added the comment:
<nod>, it seems like the problem must somehow stem from the new commit using
frame.f_code.co_filename (or the C equivalent), instead of using __file__ as
previously.
Consider this warn2.py, similar to the other but with no single quotes in the
warning message:
```
import doctest
class Tester:
r"""Provide docstring for testing.
>>> import warnings
>>> from contextlib import redirect_stderr
>>> from io import StringIO
>>> sio = StringIO()
>>> with redirect_stderr(sio):
... warnings.warn("Warning with no quotes")
>>> sio.getvalue()
'...'
"""
doctest.run_docstring_examples(
Tester(),
{},
optionflags=doctest.ELLIPSIS,
)
```
This doctest PASSES for me in both 3.7 and 3.8; note that the expected doctest
output from `sio.getvalue()` is *single-quote delimited*. This implies to me
that REPL string output is single-quote delimited by default, and that there's
some sort of "smart string formatter" functionality involved that is working
correctly in 3.7 but not in 3.8, which REPL-prints the single-quote-containing
string using enclosing double-quotes, so as to avoid escaping the internal
single quotes.
Why 11a8966 would break this in this way is ... baffling to me.
---
Unfortunately, I don't think it will work to fix the doctest on my end simply
by using `print(sio.getvalue())`, as the resulting message is one line long in
3.7, but two lines long in 3.8. Further, doctest gets confused when you try to
start a line of output with an ellipsis, as it thinks it's a continuation of
the prior command.
----------
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue36695>
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