On Sun, Dec 14, 2008 at 2:38 AM, Gabriel Genellina <gagsl-...@yahoo.com.ar>wrote:
> En Sun, 14 Dec 2008 02:40:10 -0200, Benjamin Kaplan > <benjamin.kap...@case.edu> escribió: > > On Sat, Dec 13, 2008 at 10:49 PM, Daniel Fetchinson < >> fetchin...@googlemail.com> wrote: >> >> >> Is it a feature that >>> >> >>> >> 1 or 1/0 >>> >> >>> >> returns 1 and doesn't raise a ZeroDivisionError? If so, what's the >>> >> rationale? >>> > >>> > http://en.wikipedia.org/wiki/Short-circuit_evaluation >>> >>> Let me just point out that unsuspecting people (like me) might rely on >>> the whole expression to be evaluated and rely on exceptions being >>> raised if needed. >>> >> >> If you want both expressions evaluated, you can use & and |, just like in >> C >> and Java (&& and || are used for short circuit evaluation in those >> languages). >> > > No: &, | (and ^, too) perform bitwise operations in Python, C and Java: > Perhaps I should have mentioned that you have to restrict yourself to bools (or 0 and 1) when doing this. I know that they perform bitwise operations when you do them with ints- I was assuming the OP was dealing with bools. > > py> 1 & 2 > 0 > > && and || --in both C and Java-- are like `and` and `or` in Python; they > perform logical operations, and short-circuit evaluation of their operands. > If you want to evaluate a logical expression without short circuiting, do > that explicitely: > > a = first part > b = second part > if a or b: ... > > -- > Gabriel Genellina > > > -- > http://mail.python.org/mailman/listinfo/python-list >
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