Re: [libreoffice-users] LibreLogo - Error in Help for RANGE?

Den 10.12.2015 23:27, libreoffice-ml.mbourne@spamgourmet.com skreiv:
> Kolbjørn Stuestøl wrote:
> > Continuing experimenting with LibreLogo.
> >
> > Help for LibreLogo says that:
> >
> > PRINT RANGE 3 10 3 ; print [3, 6, 9] (i.e. outputs 3, 6, 9.)
> >
> > When I try it I get the output: "range (3 10 3)".
> > (Also "LABEL RANGE 3 10 3" and "TEXT RANGE 3 10 3" outputs "range (3 10
> > 3)".)
> >
> > I do not know Python programming. Is this the way Python handles lists?
> > Help call this a Python-like list generation.
>
> It looks like the LibreLogo code is translated into Python code, and 
> what you're seeing is a change between Python 2.7 and Python 3. In 
> Python 2.7, range() returns a list of values, which would display as 
> [3, 6, 9]. In Python 3, range() returns an iterable object, which will 
> return each value in turn as you iterate over it (it doesn't actually 
> create a list of all the values, so is more efficient for large ranges).
This means that the three PRINT examples must/should be rewritten.
To get the expected result I have to print out a list of the items 
created by AREA:
PRINT = LIST AREA 0 10 2
which prints "[0, 2, 4, 6, 8]" as expected.

> > I expected that "PRINT RANGE 0 10 2" will output every second item in
> > the range: 0, 2, 4, 6, 8.
>
> In Python, you should be able to get a list by using:
>   list(range(0, 10, 2))
> I'm not sure how that would be done in Logo though; perhaps:
>   LIST RANGE 0 10 2
> following the syntax you've shown in other examples.
Yes. As you see above.
> > On the other hand, the function
> > FOR :n IN RANGE 10 101 5 [
> >      FORWARD :n LEFT 90
> > ]
> > works as expected.
>
> The "for" loop iterates over the iterator returned by range(), so 
> executes the loop for each number which would have been in the list.
Yes.
> > Am I misunderstanding the Help for RANGE or is the Help incorrect?
>
> Perhaps the help is out of date, or perhaps it depends which version 
> of Python you have. I don't know whether LibreLogo includes a Python 
> interpreter or uses one you install separately.
Whatever the reason, I think the help should be rewritten. As a 
translator I am able to rewrite the help in Norwegian but have no access 
to change the original text.

If LibreLogo use Python, it is included in the full installation. I have 
not installed it separately.

Thank you for your help.
Kolbjørn
> > Hoping I am not the only one playing with LibreLogo :-)
> >
> > Kolbjørn


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