remove all elements in a list with a particular value

[Larry Bates]

Lisa 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
> 

When you split on a space (' ') multiple spaces will return empty list
elements between them.  Change to:

line = '   SRCPARAM   1 6.35e-07 15.00  340.00   1.10      3.0   '
li = line.split()

And you will get what you want:

['SRCPARAM', '1', '6.35e-07', '15.00', '340.00', '1.10', '3.0']

-Larry