Functions in Python

In Python, a function is a group of related statements that performs a specific task.

Syntax

def function_name(parameters):
      statement(s)

The function has the following components:

The def keyword is used at the start to define the function.
A colon (:) is used to mark the end of the function header.
Defining parameters (arguments) in the function through which we pass values is optional.

Function Call A function call is how you tell Python to execute a function that was previously defined.

When we call a function:

Python jumps to the function definition.
Executes the statements inside it.
Then returns back to the place where it was called.

Syntax of Function Call function_name(arguments)

Explanation:

function_name → the name of the function we defined.
arguments → values we pass to the function (optional).

Key Notes

We can call a function many times after defining it.
Always define a function before calling it.

Example: Create a function without Parameter.

Python

# Function definition
def fun_name():
    print("Hello Ashish")
    print("How are you?")

# Function call
fun_name()

The output of the above code is shown below:
Hello Ashish
How are you?

Example: Create a function with Parameter.

Python

# Function definition with a parameter
def fun_name(name):
    print(f"Hello {name}")
    print("How are you?")

# Function call with argument
fun_name("Ashish")

The output of the above code is shown below:
Hello Ashish
How are you?

Note: Here, the name is the parameter and Ashish is the argument.

Example: Create a function with multiple parameters.

Python

# Function definition
def fun_name(name, country):
    print(f"Hello {name}")
    print(f"I am living in {country}.")

# Function call
fun_name(name="Ashish", country="India")

The output of the above code is shown below:
Hello Ashish
I am living in India.

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