On 17 February 2014 09:07, Aaron Misquith <aaronmisqu...@gmail.com> wrote: > > The program that i'm working on just combines two files. Any help on > performing an union such that a keyword would not be repeated would be > appreciated. > > Code: > with open("C:\\File1.txt") as fin1: lines = fin1.readlines() > with open("C:\\File2.txt") as fin2: lines.extend(fin2.readlines()) > with open("D:\\file3.txt", "r+") as fout: fout.write('\n'.join(lines))
Something like this: with open(r'D:\file3.txt', 'r+') as fout: keywords_seen = set() for filename in r'C:\File1.txt', r'C:\File2.txt': with open(filename) as fin: for line in fin: keyword = line.strip() if keyword not in keywords_seen: fout.write(line) keywords.add(keyword) Why are you opening the output file with mode 'r+'? Are you intending to only overwrite part of the file? I think you probably should use mode 'w' instead. Oscar _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor