Den 10.12.2015 23:27, firstname.lastname@example.org 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
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.
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.
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Perhaps the help is out of date, or perhaps it depends which version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.
If LibreLogo use Python, it is included in the full installation. I have
not installed it separately.
Thank you for your help.
Hoping I am not the only one playing with LibreLogo :-)
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