On Jan 11, 9:54 am, Chris <[EMAIL PROTECTED]> wrote:
> On Jan 9, 12:34 pm, cesco <[EMAIL PROTECTED]> wrote:
>
> > Hi,
>
> > say I have a string like the following:
> > s1 = 'hi_cat_bye_dog'
> > and I want to replace the even '_' with ':' and the odd '_' with ','
> > so that I get a new string like the following:
> > s2 = 'hi:cat,bye:dog'
> > Is there a common recipe to accomplish that? I can't come up with any
> > solution...
>
> > Thanks in advance
> > Cesco
>
> A simple list comprehension is all that is needed.
>
> input_string = 'hi_cat_bye_dog'.split('_')
> output_string = ','.join([':'.join(input_string[i:i+2]) for i in
> xrange(0,len(input_string),2)])
I tried your example with my extended input cases to get:
def altrep6(s):
input_string = s.split('_')
return ','.join([':'.join(input_string[i:i+2])
for i in xrange(0,len(input_string),2)])
altrep6.author="Chris"
Giving output:
## Program by: Chris
'' RETURNS ''
'1' RETURNS '1'
'2_' RETURNS '2:'
'3_4' RETURNS '3:4'
'5_6_' RETURNS '5:6,'
'7_8_9' RETURNS '7:8,9'
'10_11_12_' RETURNS '10:11,12:'
'13_14_15_16' RETURNS '13:14,15:16'
'17_18_19_20_' RETURNS '17:18,19:20,'
'_' RETURNS ':'
'_21' RETURNS ':21'
'_22_' RETURNS ':22,'
'_23_24' RETURNS ':23,24'
'_25_26_' RETURNS ':25,26:'
'_27_28_29' RETURNS ':27,28:29'
'_30_31_32_' RETURNS ':30,31:32,'
'_33_34_35_36' RETURNS ':33,34:35,36'
'__' RETURNS ':,'
'___' RETURNS ':,:'
'____' RETURNS ':,:,'
'_____' RETURNS ':,:,:'
- Paddy.
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