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Rule of order for dot operators?

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  Rule of order for dot operators? "C.D. Reimer" <chris@cdreimer.com> - 2015-05-16 12:20 -0700
    Re: Rule of order for dot operators? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-05-16 21:40 +0200
      Re: Rule of order for dot operators? "C.D. Reimer" <chris@cdreimer.com> - 2015-05-16 12:55 -0700
        Re: Rule of order for dot operators? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-05-17 19:17 +0200
          Re: Rule of order for dot operators? Ned Batchelder <ned@nedbatchelder.com> - 2015-05-17 10:30 -0700
            Re: Rule of order for dot operators? Rustom Mody <rustompmody@gmail.com> - 2015-05-17 12:13 -0700
          Re: Rule of order for dot operators? "C.D. Reimer" <chris@cdreimer.com> - 2015-05-17 11:35 -0700
      Re: Rule of order for dot operators? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-05-17 11:45 +1000
        Re: Rule of order for dot operators? Rustom Mody <rustompmody@gmail.com> - 2015-05-16 22:06 -0700
        Re: Rule of order for dot operators? Denis McMahon <denismfmcmahon@gmail.com> - 2015-05-17 15:43 +0000
          Re: Rule of order for dot operators? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-05-20 00:30 +0200
            Re: Rule of order for dot operators? Ned Batchelder <ned@nedbatchelder.com> - 2015-05-19 18:36 -0700
              Re: Rule of order for dot operators? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-05-20 04:24 +0200
                Re: Rule of order for dot operators? Ned Batchelder <ned@nedbatchelder.com> - 2015-05-19 19:44 -0700
                Re: Rule of order for dot operators? Chris Angelico <rosuav@gmail.com> - 2015-05-20 13:11 +1000
                Re: Rule of order for dot operators? Ben Finney <ben+python@benfinney.id.au> - 2015-05-20 17:29 +1000
              Re: Rule of order for dot operators? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-05-20 12:31 +1000
        Re: Rule of order for dot operators? "C.D. Reimer" <chris@cdreimer.com> - 2015-05-17 10:50 -0700
        Re: Rule of order for dot operators? Chris Angelico <rosuav@gmail.com> - 2015-05-18 17:40 +1000
    Re: Rule of order for dot operators? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-05-17 11:31 +1000
    Re: Rule of order for dot operators? Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915@spamschutz.glglgl.de> - 2015-05-18 14:00 +0200

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#90800

Am 16.05.2015 um 21:20 schrieb C.D. Reimer:

> Does python perform the dot operators from left to right or according to
> a rule of order (i.e., multiplication/division before add/subtract)?

In this case, it does the only thing it can do:

title = slug.replace('-',' ').title()

is performed as

* take slug
* get its replace method
* call it and take the result
* get this result's title method
* call it and store its result into title.

OTOH,

title = slug.title().replace('-',' ')

is performed as

* take slug
* get its title method
* call it and take the result
* get this result's replace method
* call it and store its result into title.

Any other order would be unintuitive and just wrong.

The reason why the result is the same is because .title() title-cases 
letters after a space as well as after a '-'.

In other cases, it wouldn't do so, so you have to take care what you do.


Thomas

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