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。
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(_)。
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 the function is print_lyrics. The rules for function names are the same as for variable names: letters, Numbers and underscore are legal, but the first character can't be a number.
函数的名字就是print_lyrics，函数的命名规则和变量命名规则基本差不多，都是字幕梳子或者下划线，但是不能用数字打头。
The name of the function is print_lyrics. The rules for function names are the same as for variable names: letters, Numbers and underscore are legal, but the first character can't be a number.
函数的名字就是print_lyrics，函数的命名规则和变量命名规则基本差不多，都是字幕梳子或者下划线，但是不能用数字打头。
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