如何在 Python 中將函數作為參數傳遞？

Passing Functions as Arguments in Python: Demystifying Function Callbacks

In Python, functions can serve as arguments to other functions, a concept known as function callbacks. This functionality enables the dynamic execution of code based on the passed-in function.

To pass a function as an argument, specify the function's name without parentheses. For instance, consider the following:

def myfunc(anotherfunc, extraArgs):
    anotherfunc(*extraArgs)

In this example, myfunc accepts two arguments: anotherfunc (the function to be called) and extraArgs (a tuple of arguments).

To call the passed-in function within myfunc, use the splat operator (*) to unpack the extraArgs tuple as arguments to anotherfunc. The following example illustrates how to use myfunc:

def x(a, b):
    print('a:', a, 'b:', b)

def y(z, t):
    z(*t)

y(x, ('hello', 'manuel'))

In this example, y calls x with arguments 'hello' and 'manuel'. The output will be:

a: hello b: manuel

Function callbacks offer flexibility in code design, enabling the execution of specific functions depending on the context and the arguments provided. This approach is particularly useful in asynchronous programming, event handling, and the creation of higher-order functions.

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