What is the best way to create files?

Question

Python

I am writing a parser with saving information in csv.
The final file is 3-4 thousand lines, how is it more efficient to save information in one piece after the work is completed or lines of 50-100 in the process?
In terms of job stability?

Answer 1

If it is not possible to continue from the place where it fell, it does not matter. If there is - naturally line by line.

Answer 2

I would keep it together. 3-4 thousand lines is how much, 150KB? Even if it is 300KB, there is no problem to keep such a volume in memory without being distracted by dumping it to a file, and then saving it all at once.
The parsing process takes, perhaps, a second at most? Don't bother, save the results when you're done.
PS, of course, you should correctly arrange the processing of exceptions, if they are possible.