On May 16, 11:21 am, Lisa <[EMAIL PROTECTED]> wrote:
> I am reading in data from a text file. I want to enter each value on
> the line into a list and retain the order of the elements. The number
> of elements and spacing between them varies, but a typical line looks
> like:
>
> ' SRCPARAM 1 6.35e-07 15.00 340.00 1.10 3.0 '
>
> Why does the following not work:
>
> line = ' SRCPARAM 1 6.35e-07 15.00 340.00 1.10 3.0 '
> li = line.split(' ')
> for j,i in enumerate(li):
> if i == '':
> li.remove(i)
>
> After the original split I get:
> ['', '', '', 'SRCPARAM', '', '', '1', '6.35e-07', '15.00', '',
> '340.00', '', '', '1.10', '', '', '', '', '', '3.0', '', '', '']
>
> And after the for loop I get:
> ['SRCPARAM', '1', '6.35e-07', '15.00', '340.00', '1.10', '', '', '',
> '3.0', '', '', '']
>
> It doesn't remove all of the empty elements. Is there a better way to
> split the original string? Or a way to catch all of the empty
> elements?
>
> Thanks
As explained elsewhere, this is not the best way to do a split. But
if in the future you run into the problem of how to remove all
elements in a list with a particular value, here are two popular
approaches:
>>> items = ['', '', '', 'SRCPARAM', '', '', '1', '6.35e-07', '15.00', '',
'340.00', '', '', '1.10', '', '', '', '', '', '3.0', '', '', '']
>>> print filter(lambda i: i != '', items)
['SRCPARAM', '1', '6.35e-07', '15.00', '340.00', '1.10', '3.0']
>>> print [x for x in items if x != '']
['SRCPARAM', '1', '6.35e-07', '15.00', '340.00', '1.10', '3.0']
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