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Developers use virtualenv to manage multiple development environmentsHow do you do? It's my pleasure to answer your questionsFor example, I now need to create a div element on the page. Then we definitely need a function to create the div, Now all I need is this function, which is only responsible for creating div elements. It doesn't want to take care of the rest, That is, to realize the principle of single responsibility, Just like Kissy on Taobao, At the beginning, they defined Kissy to do only one thing and did it well. The specific instantiation class in the monomer mode was handled by the agent function. The advantage of doing so was that the specific business logic was separated. The agent only cared about the business logic of the agent. Here, the function of the agent was to instantiate the object and instantiate it only once. Create div code just create div, the others don't care; The following code:他一得了消息，立即跟着赵锋跑去找赵耘，石头叔，你想个法子让我哥进京来，不然我这嫂子就要飞了。现在启明还没有采取付费阅读，随着签约作者越来越多，支付作者稿费的确是一笔大费用。呼……杨长帆倒抽了一口凉气，主公……这……汪滶和善笑道：长帆，我自知无德无能雄霸四海，回乡拿一块封地，守好祖宗的祠堂即可，母亲同样也希望落叶归根。Ichabod Crane是美国独立战争时期的一个上尉。他自称去过地狱，然后又回来了——但不是回到他自己的时代，而是回到了250年之后的现代沉睡谷。他带来了一个惊人的秘密——这个秘密甚至可以回溯到美国独立之初，那些开国元勋（国父，签署《独立宣言》和《美国宪法》的政治领导人以及参与美国革命的领袖）全都与之有关。