Python Functions – The Building Blocks of Code

A function is a group of connected claims that together carry out a mathematical, analytic, or evaluative activity. The specific job is returned via a group of statements referred to as Python Functions.

Python functions are easy to define and crucial for programming at the intermediate level. The same standards apply to variable names and function names.

The objective is to define a function by grouping together a few often performed actions. Instead of continually constructing the same code block for different input variables, we may call the function and reuse the code it contains.

In Python, a function is one block of code that performs a specific task and can be reused multiple times in a program.

Functions are defined by using the def keyword, followed by the function name and a set of parentheses. The parentheses may contain arguments, which are values or variables that are passed to the function when it is called.

Here is an example of a simple function in Python that takes a single argument and returns the result of multiplying it by 2:

def double(x):
    return x * 2

print(double(3)) # prints 6
print(double(4)) # prints 8

Functions can also have multiple arguments, which are separated by commas within the parentheses. For example:

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

print(add(2, 3)) # prints 5
print(add(4, 5)) # prints 9

Functions can also have default values for their arguments. If a default value is specified for an argument, the function can be called without passing a value for that argument. The default value will be used in that case. For example:

def power(x, y=2):
    return x ** y

print(power(3)) # prints 9
print(power(3, 3)) # prints 27

In Python, functions can also be defined using the lambda keyword, which allows you to define small anonymous functions in a single line.

Here is an example of the lambda function that performs the same task as the double function above:

double = lambda x: x * 2

print(double(3)) # prints 6
print(double(4)) # prints 8

Functions are a powerful tool in Python, as they allow you to encapsulate and reuse code, and to write programs in a modular, organized way.