Eric Lebigot added the comment:
Good reference.
Another one would be
https://docs.python.org/3/reference/expressions.html#unary-arithmetic-and-bitwise-operations,
which explicitly indicates that it only makes sense for integer types (which
is useful to keep in mind, as one may think that it could somehow apply to
floating point numbers as well).
The one at
https://docs.python.org/3.6/reference/datamodel.html#object.__invert__ is also
important for learning that it is related to __invert__().
--
nosy: +Eric Lebigot
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