Ayushi Dalmia <ayushidalmia2...@gmail.com> Wrote in message: > Hello, > > I need to randomly access a bzip2 or gzip file. How can I set the offset for > a line and later retreive the line from the file using the offset. Pointers > in this direction will help. >
Start with the zlib module. Note that it doesn't handle all possible compression types, like compress and pack. I don't imagine that seeking to a line in a compressed text file would be any easier than a non compressed one. Try using gzip.open in a text mode to get a handle, then loop through it line by line. If you save all the offsets in a list, you should subsequently be able to seek to a remembered offset. But realize it'll be horribly slow, compared to a non compressed one. Consider using readlines and referencing the lines from there. Or building a temp file if too big for ram. If this is not enough, tell us your Python version and your os, and show what you've tried and what went wrong. -- DaveA -- https://mail.python.org/mailman/listinfo/python-list
