问题
I'm doing PEP8 checks in python using the python flake8 library. I have an import statement in an __init__.py file in one of my sub-modules which looks like this:
from .my_class import MyClass
The reason I have this line in the init file is so that I can import MyClass from the sub-module as from somemodule import MyClass instead of having to write from somemodule.my_class import MyClass.
I would like to know if it is possible to maintain this functionality while correcting the PEP8 violation?
回答1:
This is not actually a PEP8 violation. I simply do this:
from .my_class import MyClass # noqa
Edit: Another possibility is to use __all__. In that case, flake8 understands what is going on:
from .my_class import MyClass
__all__ = ['MyClass',]
回答2:
According to PEP 8, you should include MyClass in __all__, which will also fix the imported-but-not-used issue:
To better support introspection, modules should explicitly declare the names in their public API using the __all__ attribute.
来源：https://stackoverflow.com/questions/31079047/python-pep8-class-in-init-imported-but-not-used