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Functions In Python

This article will describe functions in Python.

What Is A Function?

A function is a block of code that performs a certain action like printing a statement, performing a calculation, etc. With functions, you can write code as a function definition and call the function at multiple places without writing the code multiple times.

Example

Let us work on an example. A function starts with the ‘def’ keyword followed by the function name and colon. At the end of the function, you can write a return statement. Here is an example: -

# this is the function definition
def HelloWorld():
    print("Hello World")
    return


# this is the function call
HelloWorld()

Once you run the program, you will get the following output

Picture showing the output of the HelloWorld function in python

In the above program, we have defined a function and later we have called a function.

Passing Parameter In The Function

In the same example, let us pass a parameter

# this is the function definition
def HelloWorld(name):
    print("Hello ", name)
    return


# this is the function call
HelloWorld("gyan")

Once you run the code, you will get the following output.

Picture showing the output of a function with input parameters

Returning A Value From The Function

You can also return a value from the function. Consider the following code

def WelcomeMessage(name):
    name = "Hello" + name
    return name

welcomeMessage = WelcomeMessage("gyan")
print(welcomeMessage)

Once you run the code, you will get the following output.

Picture showing the output of a function with return statement

Posted By -	Karan Gupta

Posted On -	Thursday, February 28, 2019

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