[Tutor] alphabetizing a file by lines (original) (raw)
Dragonfirebane at aol.com Dragonfirebane at aol.com
Sat Jul 17 22:22:45 CEST 2004
- Previous message: [Tutor] Why does counting to 20 million stress my computer?
- Next message: [Tutor] alphabetizing a file by lines
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
Hello all,
I'm trying to write a program that alphabetizes a file by the first letter on each line. I'm having some problems because as soon as the program finds a letter, it looks for the next letter, ignoring subsequent appearances of that letter. I can think of a couple ways to fix this but none of them seem to work. The first of these would be to add a special character to lines that have already been alphabetized, but file.write() writes to the end of a file and i would need to write the character at the current position in the file. This might be circumvented by creating a file for each line that is alphabetized, but that seems a bit extreme . . . The code is below. Any suggestions would be appreciated. Future concerns will be alphabetizing past the first letter.
############## def linum(): global i linu = open("%s%s" % (fn, ext), "r") i = 0 for line in linu.readlines(): i += 1 linu.close() def alph(): alp = open("alphebatized%s%s" % (fn, ext), "w") pal = open("prealp%s%s" % (fn, ext), "w") ## eventually for writing "\xfe" after a line that has been alphabetized read = open("%s%s" % (fn, ext), "r") ## same reason for this line until read.close() for line in read.read(): pal.write(line) pal.close() read.close() print i for do in range(i): falp(alp) alp.close() def falp(alp): global a read = open("prealp%s%s" % (fn, ext), "r") for line in read.readlines(): try: alpn = re.compile("%s(?!\xfe)" % alpha[a], re.IGNORECASE) falpn = alpn.match(line) if falpn: print line alp.write(line) a += 1 break except IndexError: pass import re import string i = 0 a = 0 alpha = ' '.join(string.ascii_letters[:26]).split() fn = raw_input("Please enter name of file you wish to prioritize: ") ext = raw_input("Please enter extension of file you wish to prioritize: ") linum() alph() ################
Here is random.txt, the file being alphabetized:
K cx c cd e X y v l f w Q z h r i T s p d m n a o j u b G
Thanks in advance, Orri
Email: dragonfirebane at aol.com AIM: singingxduck Programming Python for the fun of it. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://mail.python.org/pipermail/tutor/attachments/20040717/00ccd201/attachment.htm
- Previous message: [Tutor] Why does counting to 20 million stress my computer?
- Next message: [Tutor] alphabetizing a file by lines
- Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]