noro <[EMAIL PROTECTED]> wrote:
>OK, am not sure why, but
>
>fList=file('somefile').read()
>if fList.find('string') != -1:
> print 'FOUND'
>
>works much much faster.
>
>it is strange since i thought 'for line in file('somefile')' is
>optemized and read pages to the memory,
Step back and think ab
OK, am not sure why, but
fList=file('somefile').read()
if fList.find('string') != -1:
print 'FOUND'
works much much faster.
it is strange since i thought 'for line in file('somefile')' is
optemized and read pages to the memory,
i guess not..
George Sakkis wrote:
> noro wrote:
>
> > Is there
noro wrote:
> Is there a more efficient method to find a string in a text file then:
>
> f=file('somefile')
> for line in f:
> if 'string' in line:
> print 'FOUND'
>
> ?
Is this something you want to do only once for a given file ? The
replies so far seem to imply so and in this case
i'm not sure.
each line in the text file and an index string. i can sort the file,
and use some binary tree search on
it. (I need to do a number of searchs).
there are 1219137 indexs in the file. so maby a memory efficient sort
algorithm is in place.
how can mmap help me?
is there any fbinary sear
"John Machin" <[EMAIL PROTECTED]> schreef in bericht
news:[EMAIL PROTECTED]
>
> Luuk wrote:
> [snip]
>> some googling turned op the following.
>> Second paragraph of chapter 14 of http://www.amk.ca/python/2.1/
> [snip]
>> For a fuller discussion of the line I/O changes, see the python-dev
>> sum
noro wrote:
> Bill Scherer wrote:
>
>>noro wrote:
>>
>>
>>>Is there a more efficient method to find a string in a text file then:
>>>
>>>f=file('somefile')
>>>for line in f:
>>> if 'string' in line:
>>>print 'FOUND'
>>>
>>>?
>>>
>>>BTW:
>>>does "for line in f: " read a block of line to t
can you add some more info, or point me to a link, i havn't found
anything about binary search in mmap() in python documents.
the files are very big...
thanks
amit
Bill Scherer wrote:
> noro wrote:
>
> >Is there a more efficient method to find a string in a text file then:
> >
> >f=file('somefile
Luuk wrote:
[snip]
> some googling turned op the following.
> Second paragraph of chapter 14 of http://www.amk.ca/python/2.1/
[snip]
> For a fuller discussion of the line I/O changes, see the python-dev summary
> for January 1-15, 2001 at http://www.amk.ca/python/dev/2001-01-1.html.
That is *HIST
noro wrote:
> Is there a more efficient method to find a string in a text file then:
>
> f=file('somefile')
> for line in f:
> if 'string' in line:
> print 'FOUND'
break
^^^
Add a 'break' after the print statement - that way you won't have to
read the entire
noro wrote:
>Is there a more efficient method to find a string in a text file then:
>
>f=file('somefile')
>for line in f:
>if 'string' in line:
> print 'FOUND'
>
>?
>
>BTW:
>does "for line in f: " read a block of line to te memory or is it
>simply calls f.readline() many times?
>
>than
noro wrote:
> Is there a more efficient method to find a string in a text file then:
>
> f=file('somefile')
> for line in f:
> if 'string' in line:
> print 'FOUND'
Probably better to read the whole file at once if it isn't too big:
f = file('somefile')
data = f.read()
if 'string' in
"noro" <[EMAIL PROTECTED]> schreef in bericht
news:[EMAIL PROTECTED]
> :)
>
> via python...
>
> Luuk wrote:
>> "noro" <[EMAIL PROTECTED]> schreef in bericht
>> news:[EMAIL PROTECTED]
>> > Is there a more efficient method to find a string in a text file then:
>> >
>> > f=file('somefile')
>> > for
:)
via python...
Luuk wrote:
> "noro" <[EMAIL PROTECTED]> schreef in bericht
> news:[EMAIL PROTECTED]
> > Is there a more efficient method to find a string in a text file then:
> >
> > f=file('somefile')
> > for line in f:
> >if 'string' in line:
> > print 'FOUND'
> >
>
>
> yes, more
"noro" <[EMAIL PROTECTED]> schreef in bericht
news:[EMAIL PROTECTED]
> Is there a more efficient method to find a string in a text file then:
>
> f=file('somefile')
> for line in f:
>if 'string' in line:
> print 'FOUND'
>
yes, more efficient would be:
grep (http://www.gnu.org/softwa
Is there a more efficient method to find a string in a text file then:
f=file('somefile')
for line in f:
if 'string' in line:
print 'FOUND'
?
BTW:
does "for line in f: " read a block of line to te memory or is it
simply calls f.readline() many times?
thanks
amit
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