Decorator Prelude 1

Definition: Essentially a function, used to decorate other functions, which is to add additional functions to other functions

Principles: 1. No Modify the source code and calling method of the modified function

Decorator Prelude 2

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import timedef timer(func):def warpper(*args,**kwargs):
            start_time = time.time()
            func()
            stop_time = time.time()print("the func run time is %s" % (stop_time-start_time))return warpper
@timer  #timer(test1)def test1():
    time.sleep(3)print("in the test1")
test1()

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Implement the decorator Just reserve:

1. Functions are "variables"

2. Higher-order functions

3. Nested functions

High-order functions + nesting Function=》Decorator

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Decorator Prelude 3

Decorator Prelude 4

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