[Tutor] How to print the next line in python

[Lie Ryan]

ranjan das wrote:
> Hi,
> 
> I am new to python and i wrote this piece of code which is ofcourse not 
> serving my purpose:
> 
> Aim of the code:
> 
> To read a file and look for lines which contain the string 'CL'. When 
> found, print the entry of the next line (positioned directly below the 
> string 'CL') ....continue to do this till the end of the file (since 
> there are more than one occurrences of 'CL' in the file)
> 
> My piece of code (which just prints lines which contain the string 'CL')
> 
> f=open('somefile.txt','r')
> 
> for line in f.readlines():
> 
>      if 'CL' in line:
>               print line
> 
> 
> please suggest how do i print the entry right below the string 'CL'
> 
> 

Will "the next line" ever contains "CL"? And if it does, should we print 
the next, next line. That is, in case of:

abcCLdef
ghiCLjkl
mnopqrst

should we print:
ghiCLjkl
mnopqrst

or:
ghiCLjkl

if the latter is the case, then you can advance the file's cursor:

with open('myfile.txt') as f:
     for line in f:
         if 'CL' in line:
             print next(f)