函数定义的第一行也称为方法签名(method signature)，以def开头(def是define这个单词的缩写)。
The first line of a function definition, also known as the method signature, begins with def (shorthand for define).
函数定义的第一行也称为方法签名(method signature)，以def开头(def是define这个单词的缩写)。
The first line of a function definition, also known as the method signature, begins with def (shorthand for define).
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