Day4-python Basic 4 iterator, adorner, software development specification

1. Decorative Device

Device: The essence is a function that is used to decorate other functions. Add additional functionality to other functions

Principle:

1. Cannot modify the source code of the decorated function
2. Cannot modify the calling method of the decorated function

Realize the Knowledge reserve of adorners:

1. function is variable
2. Higher order functions
   1. Pass a function name as an argument to another function (or add a function to the source code of the decorated function without modifying it ) )
   2. The return value contains the name of the function
3. Nested functions

　　　

Day4-python Basic 4 iterator, adorner, software development specification