5.5 Unary arithmetic operations


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

u_expr  ::=  power | "-" u_expr | "+" u_expr | " " u_expr
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The unary - (minus) operator yields the negation of its numeric argument.  

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

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.  

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

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