By default, the separator is an underscore character.
在默认情况下，分隔符是下划线字符。
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。
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(_)。
Field names can contain only letters, Numbers, or the underscore character.
字段名称只能包含字母、数字或下划线字符。
In every XML tag name, the function replaces any underscore character (_) with a dash character (-).
对于每个xml标记名，该函数将其中的下划线(_)该为连字符(-)。
The name of a variable, its identifier, can be composed of letters, digits, and the underscore character.
变量名称，即它的标识符，可由字母、数字和下划线构成。
The name of a variable, its identifier, can be composed of letters, digits, and the underscore character.
变量名称，即它的标识符，可由字母、数字和下划线构成。
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