functions in python

 

Python Function

Hello Learners… In this session, you’ll learn about functions, what a function is, the syntax, components, and types of functions. Also, you’ll learn to create a function in Python.

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What is a function in Python?

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

A function is a block of code which only runs when it is called.

You can pass data, known as parameters, into a function.

A function can return data as a result.

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How to create a Function?

In Python a function is defined using the def keyword:

1 2	def my_function():     print("Hello Learners")

Keyword def that marks the start of the function header.

A function name to uniquely identify the function. Function naming follows the same rules of writing identifiers in Python.

Parameters (arguments) through which we pass values to a function. They are optional.

A colon (:) to mark the end of the function header.

An optional return statement to return a value from the function.

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How to call a Function?

To call a function, use the function name followed by parenthesis:

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def my_function():   print("Hello Learners")   my_function()

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How to return ?

The return statement is used to exit a function and go back to the place from where it was called.

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def absolute_value(num):     """This function returns the absolute     value of the entered number"""       if num >= 0:         return num     else:         return -num     print(absolute_value(2))   print(absolute_value(-4))