Python Built-in Functions 🎯

Welcome to our comprehensive guide on Python Built-in Functions! In this lesson, we'll explore various built-in functions that are essential for every Python programmer. Let's dive in!

Understanding Built-in Functions 📝

Built-in functions are predefined functions that come with Python. You don't have to define them, they are already available for use. They are an integral part of Python's standard library and are extremely useful in performing common tasks.

Commonly Used Built-in Functions 💡

1. print() Function ✅

The print() function is used to output data to the console. It's one of the first functions you'll learn when you start with Python.

python

print("Hello, World!")  # Output: Hello, World!

2. len() Function ✅

The len() function returns the length of a string, list, or any other iterable.

python

text = "CodeYourCraft"
print(len(text))  # Output: 13

3. input() Function ✅

The input() function takes user input as a string.

python

name = input("Enter your name: ")
print("Hello, " + name)  # Output: Enter your name: John, Hello, John

Advanced Built-in Functions 💡

1. map() Function ✅

The map() function applies a given function to each item of iterable(s).

python

def square(num):
    return num * num

numbers = [1, 2, 3, 4, 5]
squares = list(map(square, numbers))
print(squares)  # Output: [1, 4, 9, 16, 25]

2. filter() Function ✅

The filter() function returns an iterable of elements that satisfy a given condition.

python

def is_even(num):
    return num % 2 == 0

numbers = [1, 2, 3, 4, 5]
even_numbers = filter(is_even, numbers)
print(list(even_numbers))  # Output: [2, 4]

Practice Time 💡

We hope you enjoyed learning about Python built-in functions! Keep practicing and stay tuned for more fascinating lessons on CodeYourCraft. Happy coding! 🚀