A file iterator : loop through « File « Python Tutorial

filename = raw_input('Enter file name: ')
f = open(filename, 'r')
for eachLine in f:
    print eachLine,

12.7.loop through
12.7.1.Using Iterators with Files
12.7.2.Get the longest line
12.7.3.use the max() built-in function to get the longest string length
12.7.4.A file iterator
12.7.5.read a file line by line with a while loop