[issue37968] The turtle
New submission from Yehuda Katz : 1 - turtle bug: If I don't put parenthesis at the end of a line, I don't get error message. Try this: from turtle import * fd(50); rt done() 2 - request: Highly desirable a function that draws a circle with radius n AROUND THE TURTLE. Thank you and have a wonderful day. -- files: untitled.py messages: 350662 nosy: Yehuda priority: normal severity: normal status: open title: The turtle versions: Python 3.7 Added file: https://bugs.python.org/file48564/untitled.py ___ Python tracker <https://bugs.python.org/issue37968> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue37968] The turtle
Yehuda Katz added the comment: Sorry to say but these don't satisfy my issues. 1 the next code SHOULD produce an error message. Think that it's followed by a few dozens of code lines: from turtle import * fd; rt(90) 2 Old Logo had a useful function of creating a circle AROUND THE TURTLE. It would be very nice it such a function was built-in in turtle module. Giving this to student as a problem is not a good answer, it's more like a sort of "pass the baby" solution. Thank you for the fast reply. Yehuda Katz (Israel) On Wed, Aug 28, 2019 at 7:04 PM Nick Timkovich wrote: > > Nick Timkovich added the comment: > > Regarding #1: In Python, you may refer to a variable's name (e.g. `rt`, > which is a function), which often has no effect in a script. In the REPL > (where you see >>>) it is useful to inspect the object: > > >>> turtle.rt > > > In order to call that name/function, parentheses are *required* unlike > other languages where they are optional (Ruby). So, you don't get an error > message, but one is not expected. Linting tools can alert you to statements > that don't appear to have an effect. > > Regarding #2: Students of the turtle could create a reusable function to > draw a circle with the turtle and return to the starting position. It would > be an excellent exercise with multiple solutions! > > -- > nosy: +nicktimko > > ___ > Python tracker > <https://bugs.python.org/issue37968> > ___ > -- ___ Python tracker <https://bugs.python.org/issue37968> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue37968] The turtle
Yehuda Katz added the comment: Hi, Sorry to say but these don't satisfy my issues. 1 the next code SHOULD produce an error message. Think that it's followed by a few dozens of code lines: from turtle import * fd; rt(90) 2 Old Logo had a useful function of creating a circle AROUND THE TURTLE. It would be very nice it such a function was built-in in Python's turtle module. Giving this to student as a problem is not a good answer, it's more like a sort of "pass the baby" solution. Thank you for the fast reply. On Wed, Aug 28, 2019 at 7:26 PM Yehuda Katz wrote: > > Yehuda Katz added the comment: > > Sorry to say but these don't satisfy my issues. > > 1 the next code SHOULD produce an error message. Think that it's followed > by a few dozens of code lines: > from turtle import * > fd; rt(90) > 2 Old Logo had a useful function of creating a circle AROUND THE TURTLE. It > would be very nice it such a function was built-in in turtle module. > Giving this to student as a problem is not a good answer, it's more like a > sort of "pass the baby" solution. > > Thank you for the fast reply. > > Yehuda Katz (Israel) > > On Wed, Aug 28, 2019 at 7:04 PM Nick Timkovich > wrote: > > > > > Nick Timkovich added the comment: > > > > Regarding #1: In Python, you may refer to a variable's name (e.g. `rt`, > > which is a function), which often has no effect in a script. In the REPL > > (where you see >>>) it is useful to inspect the object: > > > > >>> turtle.rt > > > > > > In order to call that name/function, parentheses are *required* unlike > > other languages where they are optional (Ruby). So, you don't get an > error > > message, but one is not expected. Linting tools can alert you to > statements > > that don't appear to have an effect. > > > > Regarding #2: Students of the turtle could create a reusable function to > > draw a circle with the turtle and return to the starting position. It > would > > be an excellent exercise with multiple solutions! > > > > -- > > nosy: +nicktimko > > > > ___ > > Python tracker > > <https://bugs.python.org/issue37968> > > ___ > > > > -- > > ___ > Python tracker > <https://bugs.python.org/issue37968> > ___ > -- ___ Python tracker <https://bugs.python.org/issue37968> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue37968] The turtle
Yehuda Katz added the comment: Such a function would be welcomed. For the best of my (limited) knowledge, there's currently no arc() function in module turtle. I can't think about a proper name... Sorry. Yehuda On Wed, Aug 28, 2019 at 7:55 PM Nick Timkovich wrote: > > Nick Timkovich added the comment: > > Resolving #1 as you suggest is next to impossible. Python can not deduce > if you meant to call the function or just refer to its name. Admittedly, > the latter is strange in non-interactive contexts, but it is valid. > > #2, as far as I can tell Logo had an ARC command: > > ARC angle radius > > draws an arc of a circle, with the turtle at the center, > with the specified radius, starting at the turtle's > heading and extending clockwise through the specified > angle. The turtle does not move. > > I guess I don't know the history about why there's turtle.circle in Python > which *does* move the turtle, and has the center *not* at the turtle. > Adding an equivalent "turtle.arc" function might be useful, though the > naming would be a bit confusing. Can you propose a better name and define > exactly how it would work? > > -- > > ___ > Python tracker > <https://bugs.python.org/issue37968> > ___ > -- ___ Python tracker <https://bugs.python.org/issue37968> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue37968] Add a turtle module function to draw a circle centered at the turtle
Yehuda Katz added the comment: G-R-E-A-T. Yehuda, Israel On Wed, Aug 28, 2019 at 8:29 PM Mark Dickinson wrote: > > Mark Dickinson added the comment: > > Updated title, type and Python version (this would be a new feature, so > would be targeted at Python 3.9). > > -- > components: +Library (Lib) > title: The turtle -> Add a turtle module function to draw a circle > centered at the turtle > type: -> enhancement > versions: +Python 3.9 -Python 3.7 > > ___ > Python tracker > <https://bugs.python.org/issue37968> > ___ > -- ___ Python tracker <https://bugs.python.org/issue37968> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue37968] Add a turtle module function to draw a circle centered at the turtle
Yehuda Katz added the comment: G-R-E-A-T. Yehuda (Israel) On Wed, Aug 28, 2019 at 8:29 PM Mark Dickinson wrote: > > Mark Dickinson added the comment: > > Updated title, type and Python version (this would be a new feature, so > would be targeted at Python 3.9). > > -- > components: +Library (Lib) > title: The turtle -> Add a turtle module function to draw a circle > centered at the turtle > type: -> enhancement > versions: +Python 3.9 -Python 3.7 > > ___ > Python tracker > <https://bugs.python.org/issue37968> > ___ > -- ___ Python tracker <https://bugs.python.org/issue37968> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue37968] Add a turtle module function to draw a circle centered at the turtle
Yehuda Katz added the comment: Thanks for the clarifications. Yehuda(Israel) On Thu, Aug 29, 2019 at 3:36 AM Raymond Hettinger wrote: > > Raymond Hettinger added the comment: > > Yehuda, thank you for the suggestions, but we're going to decline. > > -- > resolution: -> rejected > stage: -> resolved > status: open -> closed > > ___ > Python tracker > <https://bugs.python.org/issue37968> > ___ > -- ___ Python tracker <https://bugs.python.org/issue37968> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue37968] Add a turtle module function to draw a circle centered at the turtle
Yehuda Katz added the comment: Thanks for the clarifications. Yehuda(Israel) On Thu, Aug 29, 2019 at 3:36 AM Raymond Hettinger wrote: > > Raymond Hettinger added the comment: > > Yehuda, thank you for the suggestions, but we're going to decline. > > -- > resolution: -> rejected > stage: -> resolved > status: open -> closed > > ___ > Python tracker > <https://bugs.python.org/issue37968> > ___ > -- ___ Python tracker <https://bugs.python.org/issue37968> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue37968] Add a turtle module function to draw a circle centered at the turtle
Yehuda Katz added the comment: Nick, thank you. What you linked here is Logo, with different logic & syntax than Python. The hand analogy is interesting, thank you. I rest my case and have good night from Israel. Yehuda On Thu, Aug 29, 2019 at 11:40 PM Nick Timkovich wrote: > > Nick Timkovich added the comment: > > To clarify, there is an "ARC" command in Logo that draws a circle/circle > segment *centered on* the turtle. Reference: > http://fmslogo.sourceforge.net/manual/command-arc.html Examples: > https://personal.utdallas.edu/~veerasam/logo/ That command is not/has not > been implemented in Python's turtle graphics. > > As Eric mentioned, it could be considered a benefit as the principle of > turtle graphics is that turtles have no arms to move the pen away from > their body (adolescent abnormal assassin turtles, notwithstanding). > > -- > > ___ > Python tracker > <https://bugs.python.org/issue37968> > ___ > -- ___ Python tracker <https://bugs.python.org/issue37968> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue37968] Add a turtle module function to draw a circle centered at the turtle
Yehuda Katz added the comment: Eric, thank you, I'm sorry. Yehuda On Thu, Aug 29, 2019 at 11:47 PM Eric V. Smith wrote: > > Eric V. Smith added the comment: > > It's turtle.circle: > > https://docs.python.org/3.5/library/turtle.html#turtle.circle > > @Yehuda: this isn't the appropriate place for help on how the turtle > module works. Please consider the python-tutor list. See > https://mail.python.org/mailman/listinfo/tutor > > -- > > ___ > Python tracker > <https://bugs.python.org/issue37968> > ___ > -- ___ Python tracker <https://bugs.python.org/issue37968> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue43289] step bug in turtle's for loop
New submission from Yehuda Katz : from turtle import * col = ["black", "white"] for rad in range(40, 0, -1): dot(5*rad, col[rad % 2]) done() == Any other step than -1 crashes the code. Thank you. -- messages: 387472 nosy: Yehuda priority: normal severity: normal status: open title: step bug in turtle's for loop type: behavior versions: Python 3.9 ___ Python tracker <https://bugs.python.org/issue43289> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue43289] step bug in turtle's for loop
Yehuda Katz added the comment: Correction to my msg387472: Every *even* step crashes the code. -- ___ Python tracker <https://bugs.python.org/issue43289> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue43289] step bug in turtle's for loop
Yehuda Katz added the comment: Thank you Dennis for taking the time to answer. Yehuda <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> Virus-free. www.avg.com <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> On Mon, Feb 22, 2021 at 3:21 AM Dennis Sweeney wrote: > > Dennis Sweeney added the comment: > > If I understand correctly, changing the -1 to a -2 does not actually make > the program "crash" -- you just only see one black circle. > > The reason is that range(40, 0, -2) produces 40, 38, 36, etc., all of > which are even numbers, so rad % 2 is always 0, so col[rad % 2] is always > "black". You could try: > > for index, rad in enumerate(range(40, 0, -2)): > dot(5*rad, col[index % 2]) > > In the future, I would suggest asking questions like this on > StackOverflow, since this is not a bug in Python itself. > > -- > nosy: +Dennis Sweeney > > ___ > Python tracker > <https://bugs.python.org/issue43289> > ___ > -- ___ Python tracker <https://bugs.python.org/issue43289> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue43289] step bug in turtle's for loop
Yehuda Katz added the comment: Thank you Terry, and take care. Yehuda <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> Virus-free. www.avg.com <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> On Sat, Feb 27, 2021 at 4:41 AM Terry J. Reedy wrote: > > Terry J. Reedy added the comment: > > Yehuda, one can also ask questions like this on python-list. > > In the future, when responding by email, please delete the message being > responded to, so it does not get repeated when posted to the web page. > > -- > nosy: +terry.reedy > resolution: -> not a bug > stage: -> resolved > status: open -> closed > > ___ > Python tracker > <https://bugs.python.org/issue43289> > ___ > -- ___ Python tracker <https://bugs.python.org/issue43289> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
