看别人的github公开代码，很多以_开头的函数，感觉很奇怪，很丑陋
这是通用的规范吗？是什么含义？
以 _ 开头的函数通常是包的私有函数，这些函数一般没有暴露给用户使用的计划。因为在Julia中并不原生支持 private 标记，所以这只能算是一种编程约定。
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Python 的习惯：Single and Double Underscores in Python Names – Real Python
| Convention | Example | Meaning |
|---|---|---|
| Single leading underscore | _variable |
Indicates that the name is meant for internal use only |
| Single trailing underscore | class_ |
Avoids naming conflicts with Python keywords and built-in names |
| Double leading underscore | __attribute |
Triggers name mangling in the context of Python classes |
| Double leading and trailing underscore | __name__ |
Indicates special attributes and methods that Python provides |
| Single underscore | _ |
Indicates a temporary or throwaway variable |
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