On Wed, Mar 16, 2011 at 12:22 AM, Donald Bedsole <drbeds...@gmail.com>wrote:
> > not (False and True) > > Python evaluates it as "True" > > Is it because: > 1)You evaluate what's in the parentheses first. A thing can not be > false and true at the same time, so the answer is false. > Yes, the expression in the parenthesis is evaluated first. However it's not just one thing being evaluated. 'and' evaluates one argument at a time and returns immediately if the argument is False. In this case there are 2 distinct 'things'. False and True. False, obviously, evaluates to False, which causes 'and' to stop and return False. This reduces the expression to... not False > 2)However, the "not" outside the parentheses flips the meaning of what > is inside the parentheses, so false becomes "True." ? > Correct, the expression "not False" evaluates to True. -- Jack Trades Pointless Programming Blog <http://pointlessprogramming.wordpress.com>
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