Functions of Python

Python functions:

Functions are well-organized, reusable pieces of code that are used to implement a single, or associated function.

Functions can improve the modularity of the application, and the reuse of the code. You already know that Python provides a number of built-in functions, such as print (). But you can also create your own functions, which are called user-defined functions.

Define a function:

Define a function that you want to function, the following is a simple rule:

• The function code block begins with a def keyword followed by the function identifier name and parentheses ().
• Any incoming parameters and arguments must be placed in the middle of the parentheses, and the parentheses can be used to define the parameters.
• The first line of the function statement can optionally use the document string-for storing the function description.
• The function contents begin with a colon and are indented.
• return [expression] ends the function, optionally returning a value to the caller. Return without an expression is equivalent to returning None.

Grammar

The Python definition function uses the DEF keyword, and the general format is as follows:

def function name (argument list):    function Body

Functions of Python