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

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).

> 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.

> 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.

> 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Perhaps the help is out of date, or perhaps it depends which version of 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.

> Hoping I am not the only one playing with LibreLogo :-)
>
> Kolbjørn


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