[Tutor] Read from large text file, find string save 1st string of each line where it appeared.

[Cameron Simpson]

On 29Dec2015 03:12, Steven D'Aprano <steve at pearwood.info> wrote:
>On Mon, Dec 28, 2015 at 04:50:05PM +0530, sutanu bhattacharya wrote:
>> suppose 61746245 <tutor at python.org> is my searching string. so o/p will be
[...]
>
>I don't understand the question.
>What is "o/p"?

"output"

Cheers,
Cameron Simpson <cs at zip.com.au>