On Tuesday, January 14, 2014 7:33:08 PM UTC+5:30, Chris Angelico wrote:
> On Wed, Jan 15, 2014 at 12:50 AM, Ayushi Dalmia
>
> <ayushidalmia2...@gmail.com> wrote:
>
> > I need to write into a file for a project which will be evaluated on the
> > basis of time. What is the fastest way to write 200 Mb of data, accumulated
> > as a list into a file.
>
> >
>
> > Presently I am using this:
>
> >
>
> > with open('index.txt','w') as f:
>
> > f.write("".join(data))
>
> > f.close()
>
>
>
> with open('index.txt','w') as f:
>
> for hunk in data:
>
> f.write(hunk)
>
>
>
> You don't need to f.close() - that's what the 'with' block guarantees.
>
> Iterating over data and writing each block separately means you don't
>
> have to first build up a 200MB string. After that, your performance is
>
> going to be mainly tied to the speed of your disk, not anything that
>
> Python can affect.
>
>
>
> ChrisA
Thanks for the tip on the closing of the file. I did not know that with ensures
closing of the file after iteration is over.
Which is more fast?
Creating a 200 Mb string and then dumping into a file or dividing the 200 Mb
string into chunks and then writing those chunks. Won't writing the chunks call
more i/o operation?
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