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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

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.