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Functions In Python

In this article will discuss about functions in Python

What is function?

Function is a block of code that performs a certain action like printing a statement, performing a calculation etc. With functions, you can write a 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 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

Click to Enlarge

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

Passing parameter in 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 following output

Click to Enlarge

Returning value from 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 following output

Click to Enlarge

Posted By -	Karan Gupta

Posted On -	Thursday, February 28, 2019

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