string in Python

for line in open('test.txt').readlines(): print line
for line in open('test.txt').xreadlines():print line
for line in open('test.txt'):                   print line

for char in open('test.txt').read(): print char
file = open('test.txt')
while 1:
        char=file.read(1)
        if not char:break
        print char,

(p165, Learning Python 2nd edition, O'REILLY)