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

Best way to read large file, line by line is to use python enumerate function

with open(file_name, "rU") as read_file:
    for i, row in enumerate(read_file, 1):
        #do something
        #i in line of that line
        #row containts all data of that line