Awk的另一个优点是它拥有全面的数学运算符。
Another nice thing about awk is its full complement of mathematical operators.
对于数学运算符来说，Python就遵循着数学上的规则。
For mathematical operators, Python follows mathematical convention.
常量不能用查询表达式进行初始化，因为常量只能用文本、命名常量和数学运算符的某一组合进行初始化。
Constants cannot be initialized with query expressions because constants may only be initialized with some combination of literals, named constants, and mathematical operators.
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