python - `@` 在 Python 中是什么意思？

Question

@ 在 Python 中是什么意思？

示例:@login_required等

Answer 1

装饰器语法。

A function definition may be wrapped by one or more decorator expressions. Decorator expressions are evaluated when the function is defined, in the scope that contains the function definition. The result must be a callable, which is invoked with the function object as the only argument. The returned value is bound to the function name instead of the function object. Multiple decorators are applied in nested fashion.

所以做这样的事情:

@login_required
def my_function():
    pass

这只是一种奇特的方式:

def my_function():
    pass
my_function = login_required(my_function)

有关更多信息，请查看 the documentation .