python's decorator&wrapper

[python's decorator&wrapper]

decorator

　　A function returning another function, usually applied as a function transformation using the @wrapper syntax. Common examples for decorators are classmethod() andstaticmethod().

　　The decorator syntax is merely syntactic sugar, the following two function definitions are semantically equivalent:

　　

　　The same concept exists for classes, but is less commonly used there.

udpate_wrapper:　把wrapped的属性值拷贝到wrapper

　　

wraps: partial of udpae_wrapper

　　

 how to use ?

　　

参考:  http://docs.python.org/2.7/library/functools.html#functools.update_wrapper