"Safe Cow Learning notes" python decorator

python Decorative Device

An adorner is essentially a function that handles other functions that allow additional functions to be added without the need to modify the code, and the return value of the adorner is also a function object. It is often used in scenarios where there is a need for facets, such as insert logs, performance testing, transaction processing, caching, and permission validation. Adorners are a great design for solving such problems, and with adorners, we can pull out a lot of similar code that is not related to the function itself and continue to reuse it. In summary, the function of an adorner is to add additional functionality to an already existing object.

A simple decorator

Cases:

def decro (func):d EF fn ():

Print "Before Lanuching"

return func () return FN

in the above we define a function of theDecro ()function, it first returns a call to thefn ()the function, while theDecroThere's a definition inside .fn ()function,fn ()The function first prints the"Before Lanuching",The function is then calledfunc ()
>>> def f ():
... print "HelloWorld"

...
>>> def Decro (func):

...
...
...
...
...
>>> F=decro (f) >>> F ()

DEF fn ():
Print "Before Lanuching" return func ()

RETURN fn

Before Lanuchinghelloworld

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"Safe Cow Learning notes" python decorator