On May 16, 2:25 pm, 7stud <[EMAIL PROTECTED]> wrote: > globalrev wrote: > > i ahve a program that takes certain textsnippets out of one file and > > inserts them into another. > > > problem is it jsut overwrites the first riow every time. > > > i want to insert every new piece of text into the next row. > > so: > > 1. how do i write to a new line every time i write to the file? > > > 2. if i dont want to write to a new line but just want to insert it > > after the last token in the file, how do i do then? > > Generally, you can't "insert" anything into a file. You can either > append to the end of a file, or you can rewrite the whole file. It > sounds like you probably want to read the file into an array using > readlines(). Then manipulate that array however you want--appending > and inserting--and when you are done, overwrite the file with your > array. > > However, you should be aware that as soon as you open a file for > writing all the data is erased, and if your program should happen to > crash right then, the array containing the data will disappear into > the ether and your file will be empty--in other words all your data > will be gone. To prevent such an occurence, you should write your > final data to another file, then delete the original file, and finally > change the other file's name to the original file name.
Some options: 1. Limit line length. Then offset is ( line* length ). 2. Name your relation. 3. Hijack the operating system. Remember: abc def on disk looks like abc\ndef where abcd def looks like abcd\ndef So, if you want line 2, you have to scan line 1. -- http://mail.python.org/mailman/listinfo/python-list
