Likewise, the first character of a variable name can't be a number.

同样，变量名的第一个字符不能是数字。

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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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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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