On Sat, 09 Jul 2005 06:17:20 GMT, [EMAIL PROTECTED] (Bengt Richter) wrote:
>On Fri, 8 Jul 2005 21:21:36 -0500, Alex Gittens <[EMAIL PROTECTED]> wrote:
>
>>I'm trying to define a function that prints fields of given widths
>>with specified alignments; to do so, I wrote some helper functions
>>nested inside of the print function itself. I'm getting an
>>UnboundLocalError, and after reading the Naming and binding section in
>>the Python docs, I don't see why.
>>
>It's not clear what you are trying to do with a field string that's
>wider than the specified width. Do you want to keep printing lines that
>have all blank fields except for where there is left-over too-wide remnants?
>E.g.,
>if the fields were ['left','left12345','right','12345right'] and the widths
>were [5,5,6,6] and align 'llrr'
>
>should the printout be (first two lines below just for ruler reference)
> 1234512345123456123456
> LLLLLLLLLLRRRRRRRRRRRR
> left left1 right12345r
> 2345 ight
>
>or what? I think you can get the above with more concise code :-)
>but a minor mod to yours seems to do it:
[...]
Not very tested, but you may enjoy puzzling out a more concise version
(and writing a proper test for it, since it might have bugs ;-)
>>> def fieldprint(widths, align, fields):
... if len(widths) != len(fields) or len(widths)!=len(align):
... raise ValueError, 'fieldprint argument mismatch'
... align = [getattr(str, j+'just') for j in align]
... results = []
... while ''.join(fields):
... for i, (fld, wid, alg) in enumerate(zip(fields, widths, align)):
... results.append(alg(fld[:wid], wid))
... fields[i] = fld[wid:]
... results.append('\n')
... return ''.join(results)
...
>>> print fieldprint([5,5,6,6], 'llrr', ['left', 'left12345', 'right',
>>> '12345right'])
left left1 right12345r
2345 ight
BTW, since this destroys the fields list, you might want to operate on a copy
(e.g., remaining_fields = fields[:]) internally, or pass a copy to the routine.
Of course, you could put "print" instead of "return" in fieldprint and just
call it
instead of printing what it returns as above, but you didn't show that part in
your
original example. BTW2, note that "str" above is the built in string type, and
it's
not a good idea to use a built in name for a variable the way your original
code did.
Regards,
Bengt Richter
--
http://mail.python.org/mailman/listinfo/python-list
