Loop over a file and write the next line if a condition is met
- by 111078384259264152964
Having a hard time fixing this or finding any good hints about it.
I'm trying to loop over one file, modify each line slightly, and then loop over a different file. If the line in the second file starts with the line from the first then the following line in the second file should be written to a third file.
!/usr/bin/env python
with open('ids.txt', 'rU') as f:
with open('seqres.txt', 'rU') as g:
for id in f:
id=id.lower()[0:4]+'_'+id[4]
with open(id + '.fasta', 'w') as h:
for line in g:
if line.startswith(''+ id):
h.write(g.next())
All the correct files appear, but they are empty. Yes, I am sure the if has true cases. :-)
"seqres.txt" has lines with an ID number in a certain format, each followed by a line with data. The "ids.txt" has lines with the ID numbers of interest in a different format. I want each line of data with an interesting ID number in its own file.
Thanks a million to anyone with a little advice!
