On 2012-05-09 15:22, BRAGA, Bruno wrote:
On Thursday, May 10, 2012, Afonso Duarte <adua...@itqb.unl.pt [1]>
wrote:
Dear All,
I’m new to Python and started to use it to search text strings in
big (>500Mb) txt files.
>
I have a list on text file (e.g. A.txt) that I want to use as a key
to search another file (e.g. B.txt), organized in the following way:
A.txt:
Aaa
>
Bbb
Ccc
Ddd
.
.
.
B.txt
Bbb
1234
> Xxx
234
I want to use A.txt to search in B.txt and have as output the
original search entry (e.g. Bbb) followed by the line that follows it
in the B.txt (e.g. Bbb / 1234).
>
I wrote the following script:
object = open(B.txt', 'r')
lista = open(A.txt', 'r')
searches = lista.readlines()
>
for line in object.readlines():
for word in searches:
if word in line:
print line+'n'
>
But from here I only get the searching entry and not the line
afterwards, I tried to google it but I got lost and didn’t manage to
do it.
Any ideas ? I guess that this is basic scripting but I just started
.
Not sure I understood the question... But:
- are you trying to "grep" the text file? (simpler than programming
in python, IMO)
- if you have multiple matches of any of the keys from A file in a
sungle line of B file, the script above will print it multiple times
true, I did not mention, but the entries in file A.txt only appear once
in b.txt.
- you need not add new line (n) in the print statement, unless you
want it to print a blank line between results
true
Based on the example you gave, the matching Bbb value in B and A are
the same, so actually line is being printed, but it is just the same
as word...
exactly! but what I want is that plus the value that proceeds that line
in the B.txt i.e.
Bbb
1234
Best
Afonso
Best
Afonso
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