W. eWatson a écrit :
I have an ordinary text file with a CR at the end of a line, and two numbers in each line. Is there some way to determine the number of lines (records) in the file before I begin reading it?
How could you know how many times a given character appears in file without reading the whole file ?
You could of course store metadata about one file in another file[1], but then you'd have to read and parse this other file, and it might go out of sync.
[1] or at the begining of your 'data' file - but you still have to rad at least this part, and you still have the potential sync problem.
Or you could use a fixed-size binary format for your records, and try dividing the file size by the record size.
What's your concrete use case, exactly ? -- http://mail.python.org/mailman/listinfo/python-list
