Unlock Python Power: Master Higher-Order Functions with Real Code Examples

1. What is a higher-order function?

Higher‑order functions in Python are functions that can accept another function as an argument. The article introduces the concept with simple examples.

2. Variables can point to functions

Using the built‑in abs() function, the difference between calling abs(-10) and referencing the function object abs is demonstrated.

print(abs(-10))

Calling the function object directly:

print(abs)

Assigning the result to a variable:

x = abs(-10)
print(x)

Assigning the function itself to a variable and calling it:

f = abs
print(f)
print(f(-10))

Reassigning the name abs to a non‑function value demonstrates that the original function is no longer reachable:

abs = 10
print(abs(-10))

3. Function names are variables

The function name itself is a variable that points to the function object. Overwriting it changes what the name refers to.

4. Passing functions as arguments

A function that receives another function as a parameter is a higher‑order function. The article defines a simple higher‑order function add that applies a passed‑in function to its numeric arguments.

def add(x, y, f):
    return f(x) + f(y)

print(add(-5, 6, abs))

5. Summary

The article uses Python basics to illustrate higher‑order functions, showing how functions can be assigned to variables, passed as arguments, and how function names behave as variables. Each concept is reinforced with runnable code snippets and their output screenshots.