How to Pass Functions as Arguments in Python?

Passing Functions as Arguments in Python

In Python, it is possible to pass functions as arguments to other functions, enhancing code flexibility and reusability. Suppose you have a function, myfunc, that takes two arguments: anotherfunc and extraArgs. Your goal is to call anotherfunc from within myfunc, passing extraArgs.

How to Pass Functions as Arguments

To pass a function as an argument, you can simply use the function name without parentheses. For instance, myfunc could be defined as:

def myfunc(anotherfunc, extraArgs):
    # Call `anotherfunc` here, passing it `extraArgs`
    pass

To pass a list or tuple of arguments as extraArgs, you can use the asterisk (*) operator to unpack them. myfunc can then call anotherfunc as follows:

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

Example

Consider the following functions:

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

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

When you call y with x as the first argument and a tuple of arguments as the second argument, x is called with those arguments:

>>> y(x, ('hello', 'manuel'))
a: hello b: manuel

Conclusion

Passing functions as arguments allows you to create flexible and reusable code in Python, enabling you to encapsulate functionality and handle various scenarios dynamically. By understanding how to pass functions as arguments, you can enhance your code and make it more adaptable to different requirements.

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