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Alex Rivera
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I have a text file which looks like this: blah blah foo1 bar1 foo1 bar2 foo1 bar3 foo2 bar4 foo2 bar5 blah blah Now I want to insert 'foo bar' between 'foo1 bar3' and 'foo2 bar4' . This is how I did it: import shutil txt = '1.txt' tmptxt = '1.txt.tmp' with open(tmptxt, 'w') as outfile: with open(txt, 'r') as infile: flag = 0 for line in infile: if not line.startswith('foo1') and flag == 0: outfile.write(line) continue if line.startswith('foo1') and flag == 0: flag = 1 outfile.write(line) continue if line.startswith('foo1') and flag == 1: outfile.write(line) continue if not line.startswith('foo1') and flag == 1: outfile.write('foo bar\n') outfile.write(line) flag = 2 continue if not line.startswith('foo1') and flag == 2: outfile.write(line) continue shutil.move(tmptxt, txt) This works for me, but looks rather ugly.
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