On Jul 22, 1:03 pm, leegold <[EMAIL PROTECTED]> wrote: > say I have a text file: > > zz3 uaa4a ss 7 uu > zz 3 zzzz66 ppazz9 > aaaaaaaaa00000zz0 > > I want to sort the text file. I want the key to be the number after > the two "zz". Or I guess a string of two zz then a number....So > that's 3, 9, 0 > > I'm trying to say that I want to sort lines in a file based on a > regular expression. How could I do that in Python? I'm limited to > Python 2.1, I can't add any 2nd party newer tools.
To save anybody who's tempted to write the whole shebang for you, please specify which part(s) of the exercise you are having problems with: (a) reading lines from a file (b) extracting a sort key from a line [presuming "number" means "positive integer"; what do you want to do if multiple lines have the same number? what if no number at all"] (c) creating a list of tuples, where each tuple is (key, line_contents) (d) sorting the list (e) creating the output file from the sorted list. -- http://mail.python.org/mailman/listinfo/python-list
