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and becomes or and or becomes and

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  and becomes or and or becomes and Stef Mientki <stef.mientki@gmail.com> - 2011-05-22 21:23 +0200
    Re: and becomes or and or becomes and Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2011-05-22 23:57 +0200
      Re: and becomes or and or becomes and Terry Reedy <tjreedy@udel.edu> - 2011-05-22 18:14 -0400
    Re: and becomes or and or becomes and Tim Roberts <timr@probo.com> - 2011-05-22 15:39 -0700
      Re: and becomes or and or becomes and Chris Angelico <rosuav@gmail.com> - 2011-05-23 09:28 +1000
      Re: and becomes or and or becomes and Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-05-23 00:30 +0000
        Re: and becomes or and or becomes and rusi <rustompmody@gmail.com> - 2011-05-23 08:30 -0700
          Re: and becomes or and or becomes and bch <bch.itbgcthate@gmail.com> - 2011-05-28 05:27 -0700
            Re: and becomes or and or becomes and Chris Angelico <rosuav@gmail.com> - 2011-05-28 22:50 +1000
      Re: and becomes or and or becomes and Nobody <nobody@nowhere.com> - 2011-05-28 14:31 +0100
        Re: and becomes or and or becomes and Chris Angelico <rosuav@gmail.com> - 2011-05-29 00:04 +1000

#6000 — and becomes or and or becomes and

hello,

must of us will not use single bits these days,
but at first sight, this looks funny :

>>> a=2
>>> b=6
>>> a and b
6
>>> a & b
2
>>> a or b
2
>>> a | b
6

cheers,
Stef

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#6011

Stef Mientki wrote:

> must of us will not use single bits these days,
> but at first sight, this looks funny :
> 
>>>> a=2
>>>> b=6
>>>> a and b
> 6
>>>> a & b
> 2
>>>> a or b
> 2
>>>> a | b
> 6

Change the order of the operands and see what happens.

-- 
PointedEars

Bitte keine Kopien per E-Mail. / Please do not Cc: me.

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#6013

On 5/22/2011 5:57 PM, Thomas 'PointedEars' Lahn wrote:
> Stef Mientki wrote:
>
>> must of us will not use single bits these days,
>> but at first sight, this looks funny :
>>
>>>>> a=2
>>>>> b=6
>>>>> a and b
>> 6
>>>>> a&  b
>> 2
>>>>> a or b
>> 2
>>>>> a | b
>> 6
>
> Change the order of the operands and see what happens.

or change a,b to 1,2


-- 
Terry Jan Reedy

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#6014

Stef Mientki <stef.mientki@gmail.com> wrote:
>
>must of us will not use single bits these days,
>but at first sight, this looks funny :
>
>>>> a=2
>>>> b=6
>>>> a and b
>6
>>>> a & b
>2
>>>> a or b
>2
>>>> a | b
>6

That IS funny.  Interesting how a careful choice of arugments will fool us.
One of my favorite math jokes is like that.  A teacher asked a student to
reduce the following fraction: 
  16
 ----
  64

He says "all I have to do is cancel out the sixes, so the answer is 1/4".
-- 
Tim Roberts, timr@probo.com
Providenza & Boekelheide, Inc.

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#6024

On Mon, May 23, 2011 at 8:39 AM, Tim Roberts <timr@probo.com> wrote:
> That IS funny.  Interesting how a careful choice of arugments will fool us.
> One of my favorite math jokes is like that.  A teacher asked a student to
> reduce the following fraction:
>  16
>  ----
>  64
>
> He says "all I have to do is cancel out the sixes, so the answer is 1/4".

I like. :)

But in the OP, the difference between "and" and "&", or "or" and "|",
is subtle yet absolute. They are completely different operators. The
bitwise operators function like the arithmetic operators - evaluate
both operands, then do something that combines them into one value.
The logical operators, though, are more like the if statement:

q = a and b

is similar to:

if a:
  q = a
else:
  q = b

(Pedants, please note that I said "similar" not "equivalent".) They
happen to do similar things, but they're completely different in
operation. I do like the humour value from the careful selection of
operands though!

Chris Angelico

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#6028

On Sun, 22 May 2011 15:39:33 -0700, Tim Roberts wrote:

> Stef Mientki <stef.mientki@gmail.com> wrote:
>>
>>must of us will not use single bits these days, but at first sight, this
>>looks funny :
>>
>>>>> a=2
>>>>> b=6
>>>>> a and b
>>6
>>>>> a & b
>>2
>>>>> a or b
>>2
>>>>> a | b
>>6
> 
> That IS funny.  Interesting how a careful choice of arugments will fool
> us. One of my favorite math jokes is like that.  A teacher asked a
> student to reduce the following fraction:
>   16
>  ----
>   64
> 
> He says "all I have to do is cancel out the sixes, so the answer is
> 1/4".

One of my favourite variations on this is by Abbott and Costello, where 
Costello proves that 13*7 = 28 in three different ways.

http://www.youtube.com/watch?v=rLprXHbn19I



-- 
Steven

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#6078

On May 23, 5:30 am, Steven D'Aprano <steve
+comp.lang.pyt...@pearwood.info> wrote:
> On Sun, 22 May 2011 15:39:33 -0700, Tim Roberts wrote:
> > Stef Mientki <stef.mien...@gmail.com> wrote:
>
> >>must of us will not use single bits these days, but at first sight, this
> >>looks funny :
>
> >>>>> a=2
> >>>>> b=6
> >>>>> a and b
> >>6
> >>>>> a & b
> >>2
> >>>>> a or b
> >>2
> >>>>> a | b
> >>6
>
> > That IS funny.  Interesting how a careful choice of arugments will fool
> > us. One of my favorite math jokes is like that.  A teacher asked a
> > student to reduce the following fraction:
> >   16
> >  ----
> >   64
>
> > He says "all I have to do is cancel out the sixes, so the answer is
> > 1/4".
>
> One of my favourite variations on this is by Abbott and Costello, where
> Costello proves that 13*7 = 28 in three different ways.
>
> http://www.youtube.com/watch?v=rLprXHbn19I

Ha Ha! [You're hired Steven]

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#6465

On May 23, 11:30 pm, rusi <rustompm...@gmail.com> wrote:
> On May 23, 5:30 am, Steven D'Aprano <steve
>
>
>
> +comp.lang.pyt...@pearwood.info> wrote:
> > On Sun, 22 May 2011 15:39:33 -0700, Tim Roberts wrote:
> > > Stef Mientki <stef.mien...@gmail.com> wrote:
>
> > >>must of us will not use single bits these days, but at first sight, this
> > >>looks funny :
>
> > >>>>> a=2
> > >>>>> b=6
> > >>>>> a and b
> > >>6
> > >>>>> a & b
> > >>2
> > >>>>> a or b
> > >>2
> > >>>>> a | b
> > >>6
>
> > > That IS funny.  Interesting how a careful choice of arugments will fool
> > > us. One of my favorite math jokes is like that.  A teacher asked a
> > > student to reduce the following fraction:
> > >   16
> > >  ----
> > >   64
>
> > > He says "all I have to do is cancel out the sixes, so the answer is
> > > 1/4".
>
> > One of my favourite variations on this is by Abbott and Costello, where
> > Costello proves that 13*7 = 28 in three different ways.
>
> >http://www.youtube.com/watch?v=rLprXHbn19I
>
> Ha Ha! [You're hired Steven]

And of course, a programmer cannot tell the difference between
Halloween and Christmas day.

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#6468

On Sat, May 28, 2011 at 10:27 PM, bch <bch.itbgcthate@gmail.com> wrote:
> And of course, a programmer cannot tell the difference between
> Halloween and Christmas day.

Well known, of course. But a lot of modern programmers don't speak
octal, they only use another power-of-two base; it's as though
someone's cast a hex on them.

Chris Angelico

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#6470

On Sun, 22 May 2011 15:39:33 -0700, Tim Roberts wrote:

> That IS funny.  Interesting how a careful choice of arugments will fool us.
> One of my favorite math jokes is like that.  A teacher asked a student to
> reduce the following fraction: 
>   16
>  ----
>   64
> 
> He says "all I have to do is cancel out the sixes, so the answer is 1/4".

Not Python, but:

	#define SIX  1 + 5
	#define NINE 8 + 1
	...
	printf("six times nine is: %d\n", SIX * NINE);

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#6477

On Sat, May 28, 2011 at 11:31 PM, Nobody <nobody@nowhere.com> wrote:
> Not Python, but:
>
>        #define SIX  1 + 5
>        #define NINE 8 + 1
>        ...
>        printf("six times nine is: %d\n", SIX * NINE);

*AWESOME*!! That is brilliant!

DNA FTW.

ChrisA

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