Den 10.12.2015 23:27, [email protected] 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Perhaps the help is out of date, or perhaps it depends which version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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