Extract rows between two identical strings?












-1















Since I have a file which is huge (several GBs), I would not like to load the whole thing in memory and instead use *generators to load line by line. My file is something like this:



# millions of lines

..................

..................

keyw 28899

2233 121 ee 0o90 jjsl

2321 232 qq 0kj9 jksl

keyw 28900

3433 124 rr 8hu9 jkas

4532 343 ww 3ko9 aslk

1098 115 uy oiw8 rekl

keyw 29891

..................

..................

# millions more


So far I have found a similar answer here. But I am lost as how to implement it. Because the ans has specific identifiers Start and Stop, whereas my files have an incremental number with a identical keyword. I would like some help regarding this.



Edit: Generators not iterators






python







share|improve this question

























  • Using iterators in python has nothing to do with whether data from disk is loaded to memory or not.

    – SilverSlash
    Nov 14 '18 at 13:32













  • I meant generators not iterators

    – rNov
    Nov 14 '18 at 13:36
















-1















Since I have a file which is huge (several GBs), I would not like to load the whole thing in memory and instead use *generators to load line by line. My file is something like this:



# millions of lines

..................

..................

keyw 28899

2233 121 ee 0o90 jjsl

2321 232 qq 0kj9 jksl

keyw 28900

3433 124 rr 8hu9 jkas

4532 343 ww 3ko9 aslk

1098 115 uy oiw8 rekl

keyw 29891

..................

..................

# millions more


So far I have found a similar answer here. But I am lost as how to implement it. Because the ans has specific identifiers Start and Stop, whereas my files have an incremental number with a identical keyword. I would like some help regarding this.



Edit: Generators not iterators






python







share|improve this question

























  • Using iterators in python has nothing to do with whether data from disk is loaded to memory or not.

    – SilverSlash
    Nov 14 '18 at 13:32













  • I meant generators not iterators

    – rNov
    Nov 14 '18 at 13:36














-1












-1








-1








Since I have a file which is huge (several GBs), I would not like to load the whole thing in memory and instead use *generators to load line by line. My file is something like this:



# millions of lines

..................

..................

keyw 28899

2233 121 ee 0o90 jjsl

2321 232 qq 0kj9 jksl

keyw 28900

3433 124 rr 8hu9 jkas

4532 343 ww 3ko9 aslk

1098 115 uy oiw8 rekl

keyw 29891

..................

..................

# millions more


So far I have found a similar answer here. But I am lost as how to implement it. Because the ans has specific identifiers Start and Stop, whereas my files have an incremental number with a identical keyword. I would like some help regarding this.



Edit: Generators not iterators






python







share|improve this question
















Since I have a file which is huge (several GBs), I would not like to load the whole thing in memory and instead use *generators to load line by line. My file is something like this:



# millions of lines

..................

..................

keyw 28899

2233 121 ee 0o90 jjsl

2321 232 qq 0kj9 jksl

keyw 28900

3433 124 rr 8hu9 jkas

4532 343 ww 3ko9 aslk

1098 115 uy oiw8 rekl

keyw 29891

..................

..................

# millions more


So far I have found a similar answer here. But I am lost as how to implement it. Because the ans has specific identifiers Start and Stop, whereas my files have an incremental number with a identical keyword. I would like some help regarding this.



Edit: Generators not iterators






python




python






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 14 '18 at 13:36







rNov

















asked Nov 14 '18 at 13:28









rNovrNov

3113




3113













  • Using iterators in python has nothing to do with whether data from disk is loaded to memory or not.

    – SilverSlash
    Nov 14 '18 at 13:32













  • I meant generators not iterators

    – rNov
    Nov 14 '18 at 13:36



















  • Using iterators in python has nothing to do with whether data from disk is loaded to memory or not.

    – SilverSlash
    Nov 14 '18 at 13:32













  • I meant generators not iterators

    – rNov
    Nov 14 '18 at 13:36

















Using iterators in python has nothing to do with whether data from disk is loaded to memory or not.

– SilverSlash
Nov 14 '18 at 13:32







Using iterators in python has nothing to do with whether data from disk is loaded to memory or not.

– SilverSlash
Nov 14 '18 at 13:32















I meant generators not iterators

– rNov
Nov 14 '18 at 13:36





I meant generators not iterators

– rNov
Nov 14 '18 at 13:36












1 Answer
1






active

oldest

votes


















1














If you want to adapt that answer this may help:



bucket = 

for line in infile:

    if line.split()[0] == 'keyw':

        for strings in bucket:

            outfile.write( strings + 'n')

        bucket = 

        continue



    bucket.append(line.strip())





share|improve this answer
























  • Damn. That was stupidly easy. My bad, for not sticking a while longer.

    – rNov
    Nov 14 '18 at 13:44











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1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









1














If you want to adapt that answer this may help:



bucket = 

for line in infile:

    if line.split()[0] == 'keyw':

        for strings in bucket:

            outfile.write( strings + 'n')

        bucket = 

        continue



    bucket.append(line.strip())





share|improve this answer
























  • Damn. That was stupidly easy. My bad, for not sticking a while longer.

    – rNov
    Nov 14 '18 at 13:44
















1














If you want to adapt that answer this may help:



bucket = 

for line in infile:

    if line.split()[0] == 'keyw':

        for strings in bucket:

            outfile.write( strings + 'n')

        bucket = 

        continue



    bucket.append(line.strip())





share|improve this answer
























  • Damn. That was stupidly easy. My bad, for not sticking a while longer.

    – rNov
    Nov 14 '18 at 13:44














1












1








1







If you want to adapt that answer this may help:



bucket = 

for line in infile:

    if line.split()[0] == 'keyw':

        for strings in bucket:

            outfile.write( strings + 'n')

        bucket = 

        continue



    bucket.append(line.strip())





share|improve this answer













If you want to adapt that answer this may help:



bucket = 

for line in infile:

    if line.split()[0] == 'keyw':

        for strings in bucket:

            outfile.write( strings + 'n')

        bucket = 

        continue



    bucket.append(line.strip())






share|improve this answer












share|improve this answer



share|improve this answer










answered Nov 14 '18 at 13:39









klashxxklashxx

10.1k12538




10.1k12538













  • Damn. That was stupidly easy. My bad, for not sticking a while longer.

    – rNov
    Nov 14 '18 at 13:44



















  • Damn. That was stupidly easy. My bad, for not sticking a while longer.

    – rNov
    Nov 14 '18 at 13:44

















Damn. That was stupidly easy. My bad, for not sticking a while longer.

– rNov
Nov 14 '18 at 13:44





Damn. That was stupidly easy. My bad, for not sticking a while longer.

– rNov
Nov 14 '18 at 13:44




















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