RELEASED Python 3.0 final

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    Andreas> Whenever has it been a pythonic ideal to "not allow" stuff? You
    Andreas> get warnings. Everything else is up to you.

It's more than warnings.  With properly crafted combinations of spaces and
tabs you can get code which looks like it has a certain indentation to the
human observer but which looks like it has different indentation (and thus
different semantics) to the byte code compiler.  There is often no warning.

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