python - 类定义主体中的裸字符串是什么意思？

Question

这是 django.core.exceptions 中的一段代码:

class MiddlewareNotUsed(Exception):
    "This middleware is not used in this server configuration"
    pass

类主体中的裸字符串是否仅仅是文档的文字？或者它会施展魔法吗？

Answer 1

这是一个doc string :

A docstring is a string literal that occurs as the first statement in a module, function, class, or method definition. Such a docstring becomes the __doc__ special attribute of that object.

All modules should normally have docstrings, and all functions and classes exported by a module should also have docstrings. Public methods (including the __init__ constructor) should also have docstrings. A package may be documented in the module docstring of the __init__.py file in the package directory.