keyword-method-arit hmetic 关键字匹配算法
method of keyword matching 关键字匹配法
method of memorizing keyword 关键词记忆法
If you don't like keyword arguments, you can define a new method type that doesn't have them.
如果你不喜欢关键字参数，你可以定义一种新的不包含关键字参数的方法类型。
Method definitions start with the def keyword.
方法定义由def关键字开始。
If that test fails, it delegates to the parent method using the parent keyword.
如果该测试失败，则它使用parent关键字指派给父方法。
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