Python 3 read() function

Jerry Hill malaclypse2 at gmail.com
Thu Dec 4 18:00:49 CET 2008


On Thu, Dec 4, 2008 at 11:48 AM, Christian Heimes <lists at cheimes.de> wrote:
> Cro wrote:
>> vContent = io.StringIO()
>> vContent = huge.read() # This line takes hours to process !!!
>
> Do you really mean io.StringIO? I guess you want io.BytesIO() ..

I don't think it matters.  Here's a quick comparison between 2.5 and
3.0 on a relatively small 17 meg file:

C:\>c:\Python30\python -m timeit -n 1
"open('C:\\work\\temp\\bppd_vsub.csv', 'rb').read()"
1 loops, best of 3: 36.8 sec per loop

C:\>c:\Python25\python -m timeit -n 1
"open('C:\\work\\temp\\bppd_vsub.csv', 'rb').read()"
1 loops, best of 3: 33 msec per loop

That's 3 orders of magnitude slower on python3.0!

-- 
Jerry



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