This very simple program will print all lines read from a file:

# the open function returns a file object
cars_file = open('2006_FE_Guide_14-Nov-2005_download.csv', 'rb')

# loop over each line of the file
for line in cars_file:
    print line

# releases the file object
cars_file.close()

It has the very same for loop we have been using. Only that now in instead of loop over a list in memory it will loop over a sequence of lines (the file) in disk.

You will notice this program has an inconvenient behavior: it is so fast that you can't read the lines.

Let's take care of this next.