python - What is a "callable"? - Stack Overflow
2017年4月7日 · A "callable" in Python is an object that can be called like a function. It includes functions, methods, and classes with a __call__ method.
multithreading - The difference between the Runnable and …
2008年9月26日 · Difference between Runnable and callable as below-- 1) The run() method of runnable returns void, means if you want your thread return something which you can use further then you have no choice with Runnable run() method. There is a solution 'Callable', If you want to return any thing in form of object then you should use Callable instead of ...
what exactly is python typing.Callable? - Stack Overflow
2022年2月3日 · typing.Callable is the type you use to indicate a callable. Most python types that support the operator are of the type collections.abc.Callable. Examples include functions, classmethods, staticmethods, bound methods and lambdas. In summary, anything with a __call__ method (which is how is implemented), is a callable.
javascript - Can you make an object 'callable'? - Stack Overflow
2013年10月12日 · they are not callable. they contain functions, which are callable. also applies for the answer - they are objects with functions in it, not callable. But if you wanna really get creative with arrays, you may create your own iterable and "call" it (with only int arguments) like arr[8]. or maybe use proxies (with only string argument) –
Find out if an Python object is callable - Stack Overflow
2015年10月8日 · I want to find out if an object is callable or not. I know that type() would return <class 'method'>;. But I don't know how I can check for that (e.g. with isinstance
Find out whether a C++ object is callable - Stack Overflow
2013年3月14日 · // Non-objects are callable only if they are functions. template<bool isObject, typename T> struct is_callable_impl : public is_function_t<T> {}; // Objects are callable if they have an operator(). We use a method check // to find out.
What does it mean for a class to be callable? - Stack Overflow
Leaving apart the mechanisms that mark functions as callable, Python classes have, as you know, special methods. The method that makes instances of a class callable is __call__. So, if your class has an explicit __call__ method, its instances are callable and end of story: when you call the instance, it is the __call__ method that is called.
How to understand 'Callable[..., nn.Module]' - Stack Overflow
2022年2月27日 · Thank you, I was not familiar with this syntax, now I understand Callable is a way to check a callback function of specific signatures, and the ellipsis "..." means not specifying the call signature. In this way, we can assure the return type of norm_layer is nn.Module. I should have consulted the org docs first. Thanks again. –
How to set a Django model field's default value to a function call ...
Please note that since Django 1.7, usage of lambda as default value is not recommended (c.f. @stvnw comment). The proper way to do this is to declare a function before the field and use it as a callable in default_value named arg:
How to use Callable with void return type? - Stack Overflow
2014年4月1日 · The latter provides a method to submit a Callable and returns a Future to get the result later (or wait for completion). If testA.abc() and testB.xyz() should be executed in parallel, you use the ExecutorService to execute the former in a separate thread whereas the latter is executed in the original thread. Then you wait for the completion of ...