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(python2.1-ref.info)Unary arithmetic operations

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Unary arithmetic operations
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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.