How Can I Pass a Function as an Argument in Python?

Functions as Arguments in Python

In Python, it's possible to pass a function as an argument to another function. This is known as a callback function. Let's explore how this works.

To pass a function as an argument, define a function that takes the callback function reference as an argument. This argument should also accept any additional parameters you wish to pass to the callback function.

For instance, consider the following function template:

def myfunc(anotherfunc, extraArgs):
    # somehow call `anotherfunc` here, providing `extraArgs`
    pass

To call a callback function within myfunc, use the following syntax:

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

Here, we use the asterisk (*) operator to unpack extraArgs into individual arguments, allowing the callback function to receive these arguments.

For example:

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

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

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

Output:

a: hello b: manuel

In this example, the y function passes the x function and a tuple containing the arguments as callback function arguments to the myfunc function.

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