read a very very big file with python

Question

What is the best solution to process each line of a text file whose size is about 500 MB?

The proposal to which I had thought :

def files(mon_fichier):
    while True:
        data = mon_fichier.read(1024)
        if not data:
            break
        yield data

fichier = open('tonfichier.txt', 'r')
for bloc in files(fichier):
    print bloc

Thank you in advance

Answer 1

with open('myfile.txt') as inf:
    for line in inf:
        # do something
        pass

Answer 2

Just using the standard file operations should work as long as you keep away from readlines and instead just use readline.