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What is the purpose of a callable object? What problems do they solve?
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A callable object is an object which can be used and behaves like a function but might not be a function. By using the __call__ method it is possible to define classes in a way that the instances will be callable objects. The __call__ method is called, if the instance is called "like a function", i.e. using brackets.
The “int object is not callable” error occurs when you declare a variable and name it with a built-in function name such as int() , sum() , max() , and others. The error also occurs when you don't specify an arithmetic operator while performing a mathematical operation.
Short version, Callable is a type hint that indicates a function or other object which can be called. Consider a simple example below. The bar parameter is a callable object that takes two ints as parameters and returns an int.
__call__ in Python The __call__ method enables Python programmers to write classes where the instances behave like functions and can be called like a function. When the instance is called as a function; if this method is defined, x(arg1, arg2, ...) is a shorthand for x.
Are Lambda functions callable? Hardly surprising, a Lambda function in Python is callable.
Many kinds of objects are callable in Python, and they can serve many purposes:
A great range of examples of the kind of "problems they solve" is offered by Python's standard library, which has many cases of each of the specific types I mention above.
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