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The following columns are those in books. For example, the columns on Taobao or Tmall are not realized in this way, and it doesn't matter. We can change them. We mainly learn the idea of using the intermediary mode to realize them.The template method pattern defines the algorithm skeleton in an operation in an abstract class and delays the implementation of some specific steps to subclasses. The template method enables subclasses to redefine specific steps of the algorithm without changing the structure of the algorithm, thus achieving the effect of reusing codes. The specific structure diagram is shown below.花生问道：你为什么说我弟弟是假的？大苞谷漠然道：我听说他没了记忆，想撞撞运气。Eval does not introduce variables in its outer scope2. Pay the signature business handling expenses to Jiangxi Jinge Company's account (please remit money from the Company's account, Jinge does not accept personal account remittance):2. Os.getcwd ()--Gets the current working directory.葫芦舅母急忙道：婆婆先也没想起来。