函数和方法的Keyword参数提高了代码的自解释性和灵活性。
Keyword arguments on functions and methods increase the self-documentation and flexibility of your code.
自解释性是用户界面令人满意的特性——软件很自然地引导用户，通过正确的步骤达到预期的目标。
An affordance is a desirable property of a user interface - software which naturally leads people to take the correct steps to accomplish their goals.
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