Python PyCharm 中的错误未使用导入语句？
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False Unused Import Statement in PyCharm?
提问by Mihnea Simian
Given this scenario:
鉴于这种情况：
b.py:
b.py：
import A
# A is unused here
c.py:
c.py:
from b import A
# A is used here
PyCharm complains in b.py that "import A" is an unused import and Optimize imports deletes it, breaking import in c.py
PyCharm 在 b.py 中抱怨“import A”是一个未使用的导入，优化导入将其删除，破坏了 c.py 中的导入
I know these chained imports are not a good practice (although you may use it to implement a facade module), but is it me or is it a PyCharm fail?
我知道这些链式导入不是一个好习惯（尽管您可以使用它来实现外观模块），但是是我还是 PyCharm 失败了？
采纳答案by Bakuriu
As far as I can tell this behaviour is nothandled as an inspection or some other configurable option, which means there is no #noinspection UnusedImport(or equivalent) that can be placed before the imports.
据我所知，这种行为不是作为检查或其他一些可配置选项处理的，这意味着#noinspection UnusedImport在导入之前没有（或等效的）可以放置。
If you don't want to define an unused block where you use those variables there's an other simple and probably better way to achieve what you want:
如果您不想在使用这些变量的地方定义一个未使用的块，还有另一种简单且可能更好的方法来实现您想要的：
#b.py code
import A
# [...] your code
__all__ = ['A', ...] # *all* the names you want to export
PyCharm is smart enough to look at __all__and avoid removing Aas unused import.
However there's a limitation that __all__must be a simple list literal. You cannotdo things like:
PyCharm 足够聪明，可以查看__all__并避免删除A未使用的导入。但是有一个限制，__all__必须是一个简单的列表文字。你不能做这样的事情：
__all__ = ['A'] + [name for name in iterable if condition(name)]
Not even:
甚至不：
x = 'b'
__all__ = ['A', x]
Defining __all__is a best-practice to make your module *-import safe anyway, so is something you should already do.
无论如何，定义__all__是使您的模块*-import 安全的最佳实践，因此您应该已经这样做了。
回答by benselme
You can actually use the PyUnresolvedReferencesmarker to deactivate the inspection for your import statement:
您实际上可以使用PyUnresolvedReferences标记来停用导入语句的检查：
# noinspection PyUnresolvedReferences
import A
Reference: PyCharm bug PY-2240
回答by Peter Zagubisalo
from C import A, B
_ = (A, B); del _
Works for me. I don't like
为我工作。我不喜欢
# noinspection PyUnresolvedReferences
as it would give false negatives in case A cannot be imported. And
因为如果不能导入 A，它会给出假阴性。和
__all__ = ['A', 'B', ...]
is cryptic and is not convenient for refactoring.
是神秘的，不便于重构。
