Jonathan Crall <erote...@gmail.com> added the comment:
This can be closed, but for completeness, the test you ran didn't verify that
the bug was fixed. This is because the hard coded compile flags I gave in my
example seem to have changed in Python 3.9 (is this documented?).
In python3.8 the compile flags I specified correspond to division,
print_function, unicode_literals, and absolute_import.
python3.8 -c "import __future__; print(__future__.print_function.compiler_flag
| __future__.division.compiler_flag | __future__.unicode_literals.compiler_flag
| __future__.absolute_import.compiler_flag)"
Results in: 221184
In Python 3.9 the same code results in: 3538944
I can modify the MWE to accommodate these changes:
./python -c "import __future__; print(eval(compile('[i for i in range(3)]',
mode='eval', filename='fo', flags=__future__.print_function.compiler_flag |
__future__.division.compiler_flag | __future__.unicode_literals.compiler_flag |
__future__.absolute_import.compiler_flag)))"
Which does produce the correct output as expected. So, the issue can remain
closed. I am curious what the bug in 3.9.0a5 was though if you have any
speculations.
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<https://bugs.python.org/issue40438>
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