Hi, I have to extract say column 1, column 2 ..... column 6 (six different columns) from 10 different input files. The function "extract" to extract the columns works fine. For each column extracted from the input files, i have to write it in one output file. I have to make 6 output files correspondingly. How should i loop the writing of output files.
Also, you had suggested previously the following way of creating list of row lists from the list of column lists rows = map(None, *listOfColumns) I am not getting how this works. Thanks, Bala On Thu, Feb 19, 2009 at 12:38 PM, Kent Johnson <ken...@tds.net> wrote: > On Thu, Feb 19, 2009 at 5:41 AM, Bala subramanian > <bala.biophys...@gmail.com> wrote: > > Dear friends, > > > > I want to extract certain 6 different columns from a many files and write > it > > to 6 separate output files. I took some help from the following link > > > > http://mail.python.org/pipermail/tutor/2004-November/033475.html > > > > to write one column from many input files to a particular output file. > Since > > i have to extract 6 such columns, i wanted to loop the output file > writing > > part. > > Do you want the resulting files to have a single column, or one column > per input file? The mail you cite has one column per file. > > > This block of the script is shown in bold below. I see some odd output > > file names. > > You are using the string representation of the values as the file > name! What do you want to call the files? > > > Kindly suggest me i ) how best or should i do this loop part > > ii) explanation of the working row=map(None,*value) below which i adopted > > from the above tutor-mail list link. > > Please clarify what you want to do first. > Kent > > > > > Thanks in advance, > > Bala > > > > #!/usr/bin/env python > > from sys import argv > > lst_files=argv[1:] > > > > sh=[];st=[];sta=[];buc=[];pro=[];ope=[] > > > > def extract(fname): > > A=[];B=[];C=[];D=[];E=[];F=[] > > data=open(fname).readlines() > > for number, line in enumerate(data): > > if " Duplex" and " Shear" in line: > > number=number+3 > > for x in range(0,8): > > new=data[number] > > A.append(new[19:26]) > > B.append(new[27:34]) > > C.append(new[37:42]) > > D.append(new[44:54]) > > E.append(new[56:63]) > > F.append(new[69:75]) > > number = number + 1 > > sh.append(A) > > st.append(B) > > sta.append(C) > > buc.append(D) > > pro.append(E) > > ope.append(F) > > > > for x in lst_files: > > extract(x) > > > > list=[sh,st,sta,buc,pro,ope] > > for value in list: > > row=map(None,*value) > > out=open(str(value) + '.txt','w') > > for num in row: > > out.write('\t'.join(num)) > > out.write('\n') > > out.close() > > > > > > > > _______________________________________________ > > Tutor maillist - Tutor@python.org > > http://mail.python.org/mailman/listinfo/tutor > > > > >
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