The decorations in Python

In the object-oriented (OOP) design pattern, the decorator is called the adornment mode. The Deco pattern of OOP needs to be implemented through inheritance and composition, while Python supports decorator directly from the syntax level, in addition to the decorator of OOP. Python's decorator can be implemented using functions or classes.

Decorator can enhance the function of functions, although the definition is a bit complex, but it is very flexible and convenient to use.

Write a decorator that can print out and back the log before and after the function call ‘begin call‘ ‘end call‘ .

Think again about whether you can write a @log decorator that supports both:

@logdef f(): pass

also supports:

@log(‘execute‘)def f(): pass

1 #heelo.py2 __author__='Administrator'3 ImportFunctools4 defLog (text=None):5     defde (func):6 @functools. Wraps (func)7         defFirst (*args,**kw):8             ifText:9                 Print "Begin Call", Func.__name__,'input is', TextTen             Else: One                 Print "Begin Call", Func.__name__ Ars= func (*args,**kw) -             Print 'End Call' -             returnRS the         return First -  -     returnde -  + @log () - defNow (): +     Print 'i\ ' m a boy' A  at  - Now () - PrintNow.__name__

　　

The decorations in Python