New "module has no attribute" errors in 0.710

[gregbedwell]

This is a change in behaviour I've noticed in 0.710. I can't help but think it's so simple that I'm obviously doing something very wrong, but I can't obviously see what. My apologies for wasting your time if it is user error! None of the other checking/linting tools I've tried warn about any issues here.

Here's a reproducer for what I'm seeing:

(py3.6) e:\tmp\mypy-issue>cat foo.py
from bar import qaz

print(qaz())

(py3.6) e:\tmp\mypy-issue>cat bar\__init__.py
from bar.baz import qaz

__all__ = [
    'qaz',
]

(py3.6) e:\tmp\mypy-issue>cat bar\baz.py
def qaz() -> int:
    return 42

(py3.6) e:\tmp\mypy-issue>python --version
Python 3.6.4

(py3.6) e:\tmp\mypy-issue>python foo.py
42

(py3.6) e:\tmp\mypy-issue>pip install -q "mypy<0.710"

(py3.6) e:\tmp\mypy-issue>mypy --version
mypy 0.701

(py3.6) e:\tmp\mypy-issue>mypy --strict .

(py3.6) e:\tmp\mypy-issue>pip install -q "mypy==0.710"

(py3.6) e:\tmp\mypy-issue>mypy --version
mypy 0.710

(py3.6) e:\tmp\mypy-issue>mypy --strict .
foo.py:1: error: Module 'bar' has no attribute 'qaz'

(py3.6) e:\tmp\mypy-issue>

Let me know if you need any more information.

Thanks!

[msullivan]

This is a result of the new --no-implicit-reexports flag, which is part of --strict. See https://mypy.readthedocs.io/en/latest/command_line.html#miscellaneous-strictness-flags It can be fixed by doing `import qaz as qaz`.

…

On Thu, Jun 20, 2019, 11:03 Greg Bedwell ***@***.***> wrote: This is a change in behaviour I've noticed in 0.710. I can't help but think it's so simple that I'm obviously doing something very wrong, but I can't obviously see what. My apologies for wasting your time if it is user error! None of the other checking/linting tools I've tried warn about any issues here. Here's a reproducer for what I'm seeing: (py3.6) e:\tmp\mypy-issue>cat foo.py from bar import qaz print(qaz()) (py3.6) e:\tmp\mypy-issue>cat bar\__init__.py from bar.baz import qaz __all__ = [ 'qaz', ] (py3.6) e:\tmp\mypy-issue>cat bar\baz.py def qaz() -> int: return 42 (py3.6) e:\tmp\mypy-issue>python --version Python 3.6.4 (py3.6) e:\tmp\mypy-issue>python foo.py 42 (py3.6) e:\tmp\mypy-issue>pip install -q "mypy<0.710" (py3.6) e:\tmp\mypy-issue>mypy --version mypy 0.701 (py3.6) e:\tmp\mypy-issue>mypy --strict . (py3.6) e:\tmp\mypy-issue>pip install -q "mypy==0.710" (py3.6) e:\tmp\mypy-issue>mypy --version mypy 0.710 (py3.6) e:\tmp\mypy-issue>mypy --strict . foo.py:1: error: Module 'bar' has no attribute 'qaz' (py3.6) e:\tmp\mypy-issue> Let me know if you need any more information. Thanks! — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#7030?email_source=notifications&email_token=AACTC7LX4KKH23RBQFFIDS3P3PA7BA5CNFSM4HZZLD42YY3PNVWWK3TUL52HS4DFUVEXG43VMWVGG33NNVSW45C7NFSM4G2YU3ZQ>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AACTC7OKRAC356VYJUPGWSLP3PA7BANCNFSM4HZZLD4Q> .

[gregbedwell]

Ah. Brilliant. Thanks! Sorry for the noise

[pcorpet]

@msullivan this is blocking when this happens in a dependency (I want to access init from https://github.com/getsentry/sentry-python/blob/master/sentry_sdk/__init__.py).

Should I just run mypy with --implicit-reexport then?

And/or should I ask the lib to export it using init as init?