5.5 一元算术运算符 Unary arithmetic operations

All unary arithmetic (and bit-wise) operations have the same priority:

所有一元算术运算符(和位运算符)有相同的优先级:

u_expr ::= power | "-" u_expr | "+" u_expr | "~" u_expr

The unary - (minus) operator yields the negation of its numeric argument.

一元运算符-(减)对其数值型操作数取负.

The unary + (plus) operator yields its numeric argument unchanged.

一元运算符+(加)不改变其数值型操作数.

The unary ~ (invert) operator yields the bit-wise inversion of its plain or long integer argument. The bit-wise inversion of x is defined as -(x+1). It only applies to integral numbers.

一元运算符 (取反)对其普通整数或长整数参数求逆(比特级).x的比特级求逆运算定义为-(x+1).它仅仅用于整数型的操作数.

In all three cases, if the argument does not have the proper type, a TypeError exception is raised.

在以上所有的三种情况下, 如果参数的类型不合法, 就会引发一个TypeError异常.