By default, the separator is an underscore character.

在默认情况下，分隔符是下划线字符。

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The class name can contain any combination of letters and Numbers, as well as the underscore character, but cannot begin with a number.

类名可以包含字母、数字和下划线字符的任何组合，但不能以数字打头。

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Python variable name conventions are similar to PHP: You can only use letters, Numbers, and the underscore character (_) when creating a variable name.

Python的变量名称约定与php类似：您在创建变量名时只能使用字母、数字和下划线(_)。

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