[Tutor] SLICING
please im new to python or any other programming language. please i want to understand how slicing works [start,stop,step] >>> 'abc'[0:3] 'abc' >>>'abc'[0:-1] 'ab' why does 'abc'[2:1] or 'abc'[2:1] print ' ' instead of 'c'??? ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] In matplotlib, why are there axes classes vs. axes API? Why not list them under one documentation?
I read through some documentations yesterday after posting. I will share what I think. There are three parts to matplotlib: backend, artist, and scripting. The artist layer is the only one that really matters for matplotlib users. Why haven't the developers fixed the problem? Considering Python's growing popularity, hasn't anyone brought this up before me? Was there a plan? Thanks! On Thu, Jun 14, 2018 at 9:39 PM, Steven D'Aprano wrote: > On Thu, Jun 14, 2018 at 12:31:44PM -0400, C W wrote: > > Hello everyone, > > > > I'm working on matplotlib, could someone explain the difference between > > these two? > > > > Axes class: https://matplotlib.org/api/axes_api.html#matplotlib.axes. > Axes > > Axes and tick API: https://matplotlib.org/api/axis_api.html > > > > I began at reading axes class, but discovered axes API by accident. Why > are > > there two documentations on the same thing? Why not merge? I mean, one is > > already confusing enough. ;) > > *shrug* > > Because the designers of matplotlib suck at designing a good, easy to > use, easy to understand, simple API? Because they're not good at writing > documentation? I dunno. > > It is hard to write an API which is both *obvious* and *powerful*, but > the few times I tried using matplotlib I found it baroque and confusing. > > > > -- > Steve > ___ > Tutor maillist - Tutor@python.org > To unsubscribe or change subscription options: > https://mail.python.org/mailman/listinfo/tutor > ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] In matplotlib, why are there axes classes vs. axes API? Why not list them under one documentation?
many systems are constrained by history. matplotlib started when the vile (yes, thats just a personal opinion) matlab proved too cumbersome and someone decided to try again in python... but knowing matlab, he picked up ideas from there. since then all kinds of stuff has been bolted on. it's powerful but awkward and not very modern and has a steep learning curve. there are other options if you don't like it. try a search engine: you are certainly not the first complainer On June 15, 2018 10:35:36 AM MDT, C W wrote: >I read through some documentations yesterday after posting. > >I will share what I think. There are three parts to matplotlib: >backend, >artist, and scripting. The artist layer is the only one that really >matters >for matplotlib users. > >Why haven't the developers fixed the problem? Considering Python's >growing >popularity, hasn't anyone brought this up before me? Was there a plan? > >Thanks! > > > > > >On Thu, Jun 14, 2018 at 9:39 PM, Steven D'Aprano >wrote: > >> On Thu, Jun 14, 2018 at 12:31:44PM -0400, C W wrote: >> > Hello everyone, >> > >> > I'm working on matplotlib, could someone explain the difference >between >> > these two? >> > >> > Axes class: >https://matplotlib.org/api/axes_api.html#matplotlib.axes. >> Axes >> > Axes and tick API: https://matplotlib.org/api/axis_api.html >> > >> > I began at reading axes class, but discovered axes API by accident. >Why >> are >> > there two documentations on the same thing? Why not merge? I mean, >one is >> > already confusing enough. ;) >> >> *shrug* >> >> Because the designers of matplotlib suck at designing a good, easy to >> use, easy to understand, simple API? Because they're not good at >writing >> documentation? I dunno. >> >> It is hard to write an API which is both *obvious* and *powerful*, >but >> the few times I tried using matplotlib I found it baroque and >confusing. >> >> >> >> -- >> Steve >> ___ >> Tutor maillist - Tutor@python.org >> To unsubscribe or change subscription options: >> https://mail.python.org/mailman/listinfo/tutor >> >___ >Tutor maillist - Tutor@python.org >To unsubscribe or change subscription options: >https://mail.python.org/mailman/listinfo/tutor -- Sent from my Android device with K-9 Mail. Please excuse my brevity. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] SLICING
On 15/06/18 14:57, kenneth yashim wrote: > please im new to python or any other programming language. please i want to > understand how slicing works > > [start,stop,step] > 'abc'[0:3] > 'abc' > 'abc'[0:-1] > 'ab' > > why does 'abc'[2:1] or 'abc'[2:1] print ' ' instead of 'c'??? Because stop is lower than start and the step is implicitly +1, so the slice doesn't include anything. 'abc'[2:] will yield 'c' because it implicitly specifies stop as the end of the string. 'abc'[2:1:-1] will also yield 'c' because the -1 step value reverses the direction. HTH -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ http://www.amazon.com/author/alan_gauld Follow my photo-blog on Flickr at: http://www.flickr.com/photos/alangauldphotos ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] In matplotlib, why are there axes classes vs. axes API? Why not list them under one documentation?
On 15/06/18 17:35, C W wrote: > Why haven't the developers fixed the problem? This is open source, developed by volunteers to meet their own needs primarily and others by happy coincidence. If the existing solution meets the needs of the developers they have no incentive to spend time to "fix" it. You(*) may want it fixed and if you submit a patch they may well incorporate it. That's how open source works. (*)You or anyone else who is sufficiently irritated or motivated to spend their time fixing it... -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ http://www.amazon.com/author/alan_gauld Follow my photo-blog on Flickr at: http://www.flickr.com/photos/alangauldphotos ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] SLICING
On Fri, Jun 15, 2018 at 04:57:47PM +0300, kenneth yashim wrote: > please im new to python or any other programming language. please i want to > understand how slicing works > > [start,stop,step] > > >>> 'abc'[0:3] > 'abc' > > >>>'abc'[0:-1] > 'ab' > > why does 'abc'[2:1] or 'abc'[2:1] print ' ' instead of 'c'??? They don't return a space. They return an empty string, because the starting point comes AFTER the ending point. The slice from 2 to 1 means: - move to the right; - start at position number two - stop when you get to, or pass, position number one Since you have already passed position number one, the slice stops collecting immediately, and you have an empty slice. Slices cut the string at positions *between* the characters. If you have the string s="abcdef", imagine marking the gaps between the characters like this: |a|b|c|d|e|f| and numbering the gaps 0, 1, 2, 3, 4, 5, 6. So the slice s[2:5] cuts at the gaps numbered 2 and 5: |a|b||c|d|e||f| giving you 'cde' as the returned slice. If the ending position is to the left of the starting position, an empty slice is returned. -- Steve ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] In matplotlib, why are there axes classes vs. axes API? Why not list them under one documentation?
On Fri, Jun 15, 2018 at 12:35:36PM -0400, C W wrote: > Why haven't the developers fixed the problem? matplotlib is free, open source software. If volunteers don't "fix the problem", who is paying for the work to be done? Are you volunteering? Or willing to pay somebody to do the work? $30,000 - $50,000 would probably pay for one developer to work on mathplotlib full time for three months. Or maybe the developers don't think it is a problem that needs fixing. Maybe they're happy with it the way it is. Or they don't like it any more than you do, but they are constrained by the need to keep backwards compatibility. -- Steve ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
