[Tutor] range question

[James Reynolds]

On Thu, Sep 22, 2011 at 11:08 AM, Steven D'Aprano <steve at pearwood.info>wrote:

> Joel Knoll wrote:
>
>> Given a range of integers (1,n), how might I go about printing them in the
>> following patterns:
>> 1 2 3 4 ... n2 3 4 5 ... n 13 4 5 6 ... n 1 2 etc., e.g. for a "magic
>> square". So that for the range (1,5) for example I would get
>>
>> 1 2 3 42 3 4 13 4 1 24 1 2 3
>>
>
>
> I'm not sure what you want, because the formatting is all broken in
> Thunderbird. Your "magic square" looks more like a straight line.
>
> I'm going to take a wild stab in the dark and *guess* that you want
> something like this:
>
>
> 1 2 3 4
> 2 3 4 1
> 3 4 1 2
> 4 1 2 3
>
> Look at the pattern: each row is the same as the previous row, except the
> first item is moved to the end. You can move an item from the front to the
> end with pop() to delete it, and append() to re-add it.
>
> There are the same number of rows as columns. Putting this together:
>
>
> n = 4  # number of columns
> row = range(1, n+1)
> for row_number in range(n):
>    # print the row without commas and []
>    for item in row:
>        print item,  # note the comma at the end
>    print  # start a new line
>    # Pop the first item from the list, then add it to the end.
>    x = row.pop(0)
>    row.append(x)
>
>
>
> --
> Steven
>
>
> ______________________________**_________________
> Tutor maillist  -  Tutor at python.org
> To unsubscribe or change subscription options:
> http://mail.python.org/**mailman/listinfo/tutor<http://mail.python.org/mailman/listinfo/tutor>
>


An easier way to print without the comma, assuming 2.6 or 2.7 is to add
this:

 from __future__ import print_function

and then print like this:

print(*a)

or if you are already using python 3.0+ you just print like that without the
import.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/tutor/attachments/20110922/f0900a8b/attachment-0001.html>