Please read the docs here: http://docs.python.org/py3k/reference/expressions#boolean-operations

This is the last sentence in the '5.10. Boolean operations' text):
([...] Because not has to >>>invent<<< a value anyway, it does not bother to return a value of the same type as its argument, so e.g., not 'foo' yields False, not ''.)

Fix to:
([...] Because not has to >>>invert<<< a value anyway, it does not bother to return a value of the same type as its argument, so e.g., not 'foo' yields False, not ''.)

There is one more typo bug I noted in the documentation. Please go here: http://docs.python.org/library/locale#locale.setlocale

Fix this text...
setlocale() is not >>>thread safe<<< on most systems.

...like this:
setlocale() is not >>>thread-safe<<< on most systems.

The first one is not a typo.  Fixed the second one (and similar occurrences of "thread safe") in r85731.

Adjectives require hyphens but nouns do not.  “thread-safety” should be reverted to “thread safety”.  I haven’t searched for a grammar reference, but you can take Wikipedia as an example: “Thread safety is a computer programming concept applicable in the context of multi-threaded programs. A piece of code is thread-safe if it functions correctly during simultaneous execution by multiple threads.”

Éric Araujo wrote:
> 
> Éric Araujo <merwok@netwok.org> added the comment:
> 
> Adjectives require hyphens but nouns do not.  “thread-safety” should be reverted to “thread safety”.  I haven’t searched for a grammar reference, but you can take Wikipedia as an example: “Thread safety is a computer programming concept applicable in the context of multi-threaded programs. A piece of code is thread-safe if it functions correctly during simultaneous execution by multiple threads.”

Are you sure ?

http://en.wikipedia.org/wiki/English_compound#Types_of_compound_nouns

This appears to be more a question of personal style than a
grammar rule.

All the words that Georg Brandl fixed for this issue are okay as they stand.
Please leave them as they are written. Thank you.

On Fri, Oct 22, 2010 at 1:19 AM, Marc-Andre Lemburg
<report@bugs.python.org>wrote:

>
> Marc-Andre Lemburg <mal@egenix.com> added the comment:
>
> Éric Araujo wrote:
> >
> > Éric Araujo <merwok@netwok.org> added the comment:
> >
> > Adjectives require hyphens but nouns do not.  “thread-safety” should be
> reverted to “thread safety”.  I haven’t searched for a grammar reference,
> but you can take Wikipedia as an example: “Thread safety is a computer
> programming concept applicable in the context of multi-threaded programs. A
> piece of code is thread-safe if it functions correctly during simultaneous
> execution by multiple threads.”
>
> Are you sure ?
>
> http://en.wikipedia.org/wiki/English_compound#Types_of_compound_nouns
>
> This appears to be more a question of personal style than a
> grammar rule.
>
> ----------
> nosy: +lemburg
>
> _______________________________________
> Python tracker <report@bugs.python.org>
> <http://bugs.python.org/issue10147>
> _______________________________________
>

Marc-André: I do recall it being a grammar rule.  Take for example the difference between the compound noun “a system call” and the compound noun used as adjective “system-level” (in “a system-level call”).

Again, I’m not on a crusade here, just reacting on my gut feeling about a minor change.  I can ask English professors if you want :)

I can only repeat myself and point to <http://www.nerdcore.de/wp/2010/10/19/stephen-frys-message-to-grammer-nazis/>.