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(_)。
Thus there is no need to do so with an underscore character.
所以就没有必要再用下划线表示单词起始了。
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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