----Functions of Python basics

I. Function of functions

1. Simplify the code, function only call, can execute

Two. Definition of functions

1. Use the keyword def

2. The function name must be followed by parentheses

3. Function call through function name (parameter), can have no parameter

Three. Function parameters

Formal parameter: is actually a variable

Actual parameter: is the specific content

No default value, physical parameter, required parameter. and non-required parameters, parameter that contains default values

----Functions of Python basics