Read previous line in a file python

Question

I need to get the value of the previous line in a file and compare it with the current line as I\'m iterating through the file. The file is HUGE so I can\'t read it whole or

Answer 1

@Lim, here's how I would write it (reply to the comments)

def do_stuff_with_two_lines(previous_line, current_line):
    print "--------------"
    print previous_line
    print current_line

my_file = open('my_file.txt', 'r')

if my_file:
    current_line = my_file.readline()

for line in my_file:

    previous_line = current_line
    current_line = line

    do_stuff_with_two_lines(previous_line, current_line)