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Groups > comp.lang.python > #97272
| From | alister <alister.nospam.ware@ntlworld.com> |
|---|---|
| Newsgroups | comp.lang.python |
| Subject | Re: Check if a given value is out of certain range |
| Date | 2015-10-01 08:33 +0000 |
| Organization | Aioe.org NNTP Server |
| Message-ID | <muir4c$u2f$1@speranza.aioe.org> (permalink) |
| References | (4 earlier) <mugaov$79k$1@speranza.aioe.org> <muh0nf$jr0$1@reader1.panix.com> <87si5v3hpx.fsf@elektro.pacujo.net> <muhg4j$70q$1@speranza.aioe.org> <mailman.284.1443683939.28679.python-list@python.org> |
On Wed, 30 Sep 2015 14:46:48 -0600, Ian Kelly wrote: > On Wed, Sep 30, 2015 at 2:19 PM, alister > <alister.nospam.ware@ntlworld.com> wrote: >> On Wed, 30 Sep 2015 21:06:02 +0300, Marko Rauhamaa wrote: >> >>> Grant Edwards <invalid@invalid.invalid>: >>> >>>> not (0 <= x <= 10) (I) >>>> [...] >>>> (x < 0) or (x > 10) (II) >>>> [...] >>>> IMO, (I) is _more_ readable than (II) >>> >>> IMO, they're equally readable (except that you should drop the >>> redundant parentheses from (II)). >>> >>> >>> Marko >> >> both are correct the problem with 1 is the human brain is not >> particularity good with negatives*. >> to do not (some function) you first of all have to work out some >> function & then invert it, a computer does this without difficulty the >> human brain gets confused which is why I personally consider ii is >> more readable (YMMV especially if you are working with Boolean maths >> regularly) this example is relatively simple as things get more complex >> they become more error prone error. > > To me, the negative of one condition (is x in this range) is more easily > processable than the disjunction of two conditions that together compose > the real, more easily understood condition (is x outside this range). I > find it preferable to avoid nested conditions, not negated conditions, > and (II) has more nesting than (I). > > Thought mirrors language. In English, we typically would say "x is not > between 0 and 10", not "x is either less than 0 or greater than 10". > >> *as an example you brain cannot correctly process the following. >> >> Not (think of your left toe) >> >> you are now thinking about it aren't you? > > No, it made me think about thinking. I barely even registered the phrase > "left toe", much less thought about that. clearly it did, & you are now consciously aware of you left toe even if you try to deny it. > > In any case, that's more an issue of being unable to control what you're > thinking about. If I instruct you, "don't raise your right hand", do you > then automatically raise your right hand? Why is it that the Phrase "Don't Panic" is strongly discouraged in emergency situations? answer because the brain parses the statement as follows and focuses on Panic instead of calm. Don't : I must not do somthing what must i not do Panic: what is there to panic about? Holly shit the buildings onfire, Raise Panic The recommended phase is Stay calm Stay: ok dont change anything, whats next Calm ok I am calm that's alright then I may not have raised my right hand but I though about it (& decided no thanks) getting closer to topic, i work on PBX systems where the VM is capable of combining multiple conditions into one super condition using Boolean Operators. Invariably this does not happen & engineers are encoraged to check each condition separately because: 1) They are less likely to make a mistake 2) It is more obvious to subsequent engineers exactly what is happening 3) it is a lot easier to amend if req. on the other hand if i was designing an electronic circuit using discreet electronics I would use all available techniques to manipulate the equation to make best use of components available the may be reducing the total gate count, it may actually increase the component count so that I could use only Nand gates, or it may get strangely complex so that I could make use of spare gates on existing ic's Although I would have no difficulty reading the final equation it may not be obvious at 1st glance . -- Blue paint today. [Funny to Jack Slingwine, Guy Harris and Hal Pierson. Ed.]
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Re: Check if a given value is out of certain range Rob Gaddi <rgaddi@technologyhighland.invalid> - 2015-09-29 16:48 +0000
Re: Check if a given value is out of certain range Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-09-29 21:32 +0100
Re: Check if a given value is out of certain range sohcahtoa82@gmail.com - 2015-09-30 11:31 -0700
Re: Check if a given value is out of certain range Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-09-30 23:31 +0100
Re: Check if a given value is out of certain range Steven D'Aprano <steve@pearwood.info> - 2015-10-02 04:18 +1000
Re: Check if a given value is out of certain range John Gordon <gordon@panix.com> - 2015-10-01 18:20 +0000
Re: Check if a given value is out of certain range Steven D'Aprano <steve@pearwood.info> - 2015-10-02 05:19 +1000
Re: Check if a given value is out of certain range John Gordon <gordon@panix.com> - 2015-10-01 19:41 +0000
Re: Check if a given value is out of certain range Marko Rauhamaa <marko@pacujo.net> - 2015-10-01 22:59 +0300
Re: Check if a given value is out of certain range Emile van Sebille <emile@fenx.com> - 2015-10-01 13:15 -0700
Re: Check if a given value is out of certain range John Gordon <gordon@panix.com> - 2015-10-01 21:45 +0000
Re: Check if a given value is out of certain range Ian Kelly <ian.g.kelly@gmail.com> - 2015-10-01 16:03 -0600
Re: Check if a given value is out of certain range Chris Kaynor <ckaynor@zindagigames.com> - 2015-10-01 15:48 -0700
Re: Check if a given value is out of certain range Ian Kelly <ian.g.kelly@gmail.com> - 2015-10-01 16:01 -0600
Re: Check if a given value is out of certain range Steven D'Aprano <steve@pearwood.info> - 2015-10-03 20:29 +1000
Re: Check if a given value is out of certain range Bartc <bc@freeuk.com> - 2015-10-03 11:48 +0100
Re: Check if a given value is out of certain range Laura Creighton <lac@openend.se> - 2015-10-03 14:12 +0200
Re: Check if a given value is out of certain range Steven D'Aprano <steve@pearwood.info> - 2015-10-03 23:51 +1000
Re: Check if a given value is out of certain range wxjmfauth@gmail.com - 2015-10-03 07:19 -0700
Re: Check if a given value is out of certain range Steven D'Aprano <steve@pearwood.info> - 2015-10-05 00:47 +1100
Re: Check if a given value is out of certain range Rustom Mody <rustompmody@gmail.com> - 2015-10-04 19:28 -0700
Re: Check if a given value is out of certain range Rustom Mody <rustompmody@gmail.com> - 2015-10-04 19:32 -0700
Re: Check if a given value is out of certain range Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2015-10-03 11:49 -0400
Re: Check if a given value is out of certain range Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-10-02 00:34 +0100
Re: Check if a given value is out of certain range Michiel Overtoom <motoom@xs4all.nl> - 2015-10-05 10:18 +0200
Re: Check if a given value is out of certain range Jussi Piitulainen <harvesting@makes.email.invalid> - 2015-10-05 13:08 +0300
Re: Check if a given value is out of certain range Marko Rauhamaa <marko@pacujo.net> - 2015-10-05 14:42 +0300
Re: Check if a given value is out of certain range Chris Angelico <rosuav@gmail.com> - 2015-10-06 00:10 +1100
Re: Check if a given value is out of certain range Marko Rauhamaa <marko@pacujo.net> - 2015-10-05 16:25 +0300
Re: Check if a given value is out of certain range Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-10-05 10:19 +0100
Re: Check if a given value is out of certain range Random832 <random832@fastmail.com> - 2015-09-29 17:04 -0400
Re: Check if a given value is out of certain range Luca Menegotto <otlucaDELETE@DELETEyahoo.it> - 2015-09-30 07:57 +0200
Re: Check if a given value is out of certain range Emile van Sebille <emile@fenx.com> - 2015-09-29 14:07 -0700
Re: Check if a given value is out of certain range Ian Kelly <ian.g.kelly@gmail.com> - 2015-09-29 15:07 -0600
Re: Check if a given value is out of certain range Steven D'Aprano <steve@pearwood.info> - 2015-09-30 11:55 +1000
Re: Check if a given value is out of certain range Random832 <random832@fastmail.com> - 2015-09-29 23:08 -0400
Re: Check if a given value is out of certain range Steven D'Aprano <steve@pearwood.info> - 2015-09-30 13:14 +1000
Re: Check if a given value is out of certain range Ian Kelly <ian.g.kelly@gmail.com> - 2015-09-29 23:54 -0600
Re: Check if a given value is out of certain range Tim Chase <python.list@tim.thechases.com> - 2015-09-29 18:44 -0500
Re: Check if a given value is out of certain range alister <alister.nospam.ware@ntlworld.com> - 2015-09-30 09:41 +0000
Re: Check if a given value is out of certain range John Gordon <gordon@panix.com> - 2015-09-30 15:42 +0000
Re: Check if a given value is out of certain range Grant Edwards <invalid@invalid.invalid> - 2015-09-30 15:56 +0000
Re: Check if a given value is out of certain range Marko Rauhamaa <marko@pacujo.net> - 2015-09-30 21:06 +0300
Re: Check if a given value is out of certain range alister <alister.nospam.ware@ntlworld.com> - 2015-09-30 20:19 +0000
Re: Check if a given value is out of certain range Ian Kelly <ian.g.kelly@gmail.com> - 2015-09-30 14:46 -0600
Re: Check if a given value is out of certain range alister <alister.nospam.ware@ntlworld.com> - 2015-10-01 08:33 +0000
Re: Check if a given value is out of certain range Chris Angelico <rosuav@gmail.com> - 2015-10-01 18:37 +1000
Re: Check if a given value is out of certain range alister <alister.nospam.ware@ntlworld.com> - 2015-10-01 08:48 +0000
Re: Check if a given value is out of certain range Ian Kelly <ian.g.kelly@gmail.com> - 2015-10-01 08:14 -0600
Re: Check if a given value is out of certain range Steven D'Aprano <steve@pearwood.info> - 2015-10-02 04:59 +1000
Re: Check if a given value is out of certain range Laura Creighton <lac@openend.se> - 2015-10-01 09:40 +0200
Re: Check if a given value is out of certain range Laura Creighton <lac@openend.se> - 2015-10-01 09:58 +0200
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