On 12/16/2013 12:43 PM, Mark Lawrence wrote:
On 16/12/2013 17:16, Ravi Prabakaran wrote:
Hi,
I'm completely new to python. I just need simple logic to get output
without any loops.
I have list of string
The remainder of your description and example imply that this must be a
sequence of exactly two strings. In other words, 'list' is both too
specific as to class and not specific enough as to length.
>> and list of list of numbers.
While this must be an iterable of sequences of exactly 4 numbers.
Each string should be concatenated with every third and fourth values
to generate proper titles in list of strings.
t = ['Start','End']
a = [[1,2,3,4],
[5,6,7,8]]
Expected Result : ( list of strings )
['Start - 3 , End - 4',
'Start - 7 , End - 8']
Note : First 2 values from each list should be ignored.
Could anyone please guide me with best solution without loops ?
If the length of the iterable of sequences is not fixed, a loop of some
sort is needed.
I've no idea what your definition of "best" is but this works.
strings = ['{} - {} , {} - {}'.format(t[0], b[-2], t[1], b[-1]) for b in a]
Very nice. The following use the format mini language to do the
indexing, avoiding passing the args twice each.
strings = ['{0[0]} - {1[2]} , {0[1]} - {1[3]}'.format(t, b) for b in a]
form = '{src[0]} - {val[2]} , {src[1]} - {val[3]}'
strings = [form.format(src=t, val=b) for b in a]
The first should be faster, but may be less readable. Note that '-2' and
'-1' do not work as int indexes in the field names because they would be
interpreted as string keys rather than integers.
--
Terry Jan Reedy
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