Python Fifth day Decorator

Decorative Device

Adorners are functions, except that the function can have special meanings, adorners are used to decorate functions or classes, and adorners can be used to add actions before and after the function executes.

1 defWrapper (func):2     defresult ():3         Print 'before'4 func ()5         Print ' After'6     returnresult7  8 @wrapper9 deffoo ():Ten     Print 'Foo'

1 ImportFunctools2 3 4 defWrapper (func):5 @functools. Wraps (func)6     defwrapper ():7         Print 'before'8 func ()9         Print ' After'Ten     returnwrapper One  A @wrapper - deffoo (): -     Print 'Foo'

1 #!/usr/bin/env python2 #Coding:utf-83  4 defbefore (Request,kargs):5     Print 'before'6      7 defAfter (Request,kargs):8     Print ' After'9  Ten   One defFilter (before_func,after_func): A     defouter (main_func): -         defWrapper (Request,kargs): -               theBefore_result =Before_func (Request,kargs) -             if(Before_result! =None): -                 returnBefore_result; -               +Main_result =Main_func (Request,kargs) -             if(Main_result! =None): +                 returnMain_result; A               atAfter_result =After_func (Request,kargs) -             if(After_result! =None): -                 returnAfter_result; -               -         returnwrapper -     returnouter in       - @Filter (before, after) to defIndex (Request,kargs): +     Print 'Index' -       the       * if __name__=='__main__': $Index (+)

Python Fifth day Decorator