blueprint wraps

new function, and calling‘‘‘#decorator本身需要传入参数.def log (text):def decorator (func):def wrapper (*args,**kwargs):Print ('%s%s (): '% (text,func.__name__))Func (*args,**kwargs)Return wrapperreturn decorator@log (' Execute ')def now ():Print (' 2018-07-15 ')Now ()# "Parse" equivalent to define now = log (' Execute ') (now)#经过decorator装饰的函数, the name will be programmed wrapper, in order to avoid the code execution error since the function signed, do not need to write wrapper.__name__ = func.__name_

elements (1) after (content) inserts the content after each matching element.Describe:Insert some HTML tag code after all the paragraphs.HTML Code:JQuery Code:$ ("P"). After ("Results:(2) before () inserts the content before each matching elementDescribe:Inserts some HTML markup code before all the paragraphs.HTML Code:JQuery Code:$ ("P"). Before ("Results:[(3) InsertAfter inserts all matching elements behind another, specified set of element elements.Describe:Inserts all the paragraphs behind

function:Import functoolsdef Log (func): @functools. Wraps (func) def wrapper (*args, **kw): print "Call%s:"%func.__ name__ return func (*args, **kw) return wrapperThe wraps function can be implemented using the module FUNCTOOLS.The above describes the decorator pattern, the following gives a more complete example.#!/usr/bin/env pythonimport sys#decoratorimport functoolsdef log (func

Python Functools.wraps Instance Interpretation1. Instances where wraps are not used#!/usr/bin/env python#Coding:utf-8deflogged (func):defWith_logging (*args, * *Kwargs):" "I am wraps ' s doc" " PrintFunc.__name__+"was called" returnFunc (*args, * *Kwargs)returnwith_logging@loggeddeff (x):"""I am original Doc""" returnx + x *xPrintF.__NAME__ # expects the original name F, and the result is r

print Span class= "string" > "calls =%d"% (self.calls) self.func (*args) @decorator def foo (x, y): print " x =%d, y =%d "% (x, y) foo (1, 2) # first call "" "in decorator __init__in decorator __call__calls = 1x = 1, y = 2" "" Foo (2, 3) # second call / span> Adorner parameters 1234567891011121314151617181920212223 DefDecorator_wrapper(A, B):Print' In Decorator_wrapper 'Print"A =%d, B =%d"% (A, B)def decorator(func): print ' in decorator ' def wra

import decorator def check (flag): @decorator def check_num (func, *args, **kwargs): if Flag = = ' false ': print ' skip check! ' return func (*args,**kwargs) if Len (args)! = 2: raise Exception (' Your args number is not ') else: return func (*args, **kwargs) return check_num @check (' false ') def add (x, y): return x + y >>>add Decorator module Here, this module is relatively simple, there are some features do

); 8 Out.writeutf ("That is Pi"); 9Out.writedouble (1.41413);TenOut.writeutf ("Square root of 2"); One Out.close (); ADataInputStream in =NewDataInputStream (NewBufferedinputstream ( - NewFileOutputStream ("Data.txt")); - System.out.println (In.readdouble ()); the System.out.println (In.readutf ()); - System.out.println (In.readdouble ()); - System.out.println (In.readutf ()); - } +}Output Result:3.14159That is pi1.41413Square Root of 2(4). text File output stream:1 ImportJava.io.*; 2

designed to handle caching. Also, the JspWriter class throws ioexceptions exceptions, and PrintWriter does not. The following table lists the important methods that we will use to output the type of data such as Boolean,char,int,double,srtring,object: 1.public abstract void Clear () Clears the contents of the buffer and does not send the data to the client. 2.public abstract void Clearbuffer () Clears the contents of the buffer after the data is sent to the client. 3.public abstarct