How to read a large file - line by line?

Question

I want to iterate over each line of an entire file. One way to do this is by reading the entire file, saving it to a list, then going over the line of interest. This method

Answer 1

this is a possible way of reading a file in python:

f = open(input_file)
for line in f:
    do_stuff(line)
f.close()

it does not allocate a full list. It iterates over the lines.