How to select every other line from a text file?
gary.herron at islandtraining.com
Mon Oct 13 19:50:43 CEST 2014
On 10/13/2014 10:38 AM, Rff wrote:
> I have a text file. Now it is required to select every other line of that text to
> generate a new text file. I have read through Python grammar, but still lack the
> idea at the beginning of the task. Could you tell me some methods to get this?
Read in your lines, keeping a counter as you go. "Select" those lines
whose counter is even (or odd -- you didn't say which you wanted).
So now some questions for you:
* Do you know how to open a file and read in all the lines?
* Do you know how to count as you do so?
* Do you know how to test for evenness? (Use count%2 will be zero
for even count values.)
* Do you know how to write lines to an output file?
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