英文:
How to avoid mypy complaints when inheriting from a built-in collection type?
问题
运行mypy在这样的代码上：
class MySpecialList(list):
# funky extra functionality
会给我带来以下错误：
我可以通过根本不继承list或忽略此错误来避免它。
但是，我应该如何处理这个问题呢？这不是mypy的bug吗？
英文:
Running mypy on code like this
class MySpecialList(list):
# funky extra functionality
gives me
my_file.py:42: error: Missing type parameters for generic type "list" [type-arg]
I can avoid this by not inheriting from list at all or ignoring this error.
But how should I deal with this? Isn't this a bug in mypy?
答案1
得分: 1
这是使用 --disallow-any-generics（这是 --strict 隐含的）的结果，因为 list 等同于 list[Any]。您可以通过使用类型变量显式使 MySpecialist 成为泛型来修复它。
from typing import TypeVar
T = TypeVar('T')
class MySpecialList(list[T]):
...
英文:
This is the result of using --disallow-any-generics (which is implied by --strict), as list is equivalent to list[Any]. You can fix it by making MySpecialist explicitly generic via a type variable.
from typing import TypeVar
T = TypeVar('T')
class MySpecialList(list[T]):
...
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