for c in xrange( 'a', 'z' ):
    print c

for c in xrange(ord('a'), ord('z')+1):
    print chr(z) # resp. print unicode(z)

def char_range(c1, c2):
    """Generates the characters from `c1` to `c2`, inclusive."""
    for c in xrange(ord(c1), ord(c2)+1):
        yield chr(c)

for c in char_range('a', 'z'):
    print c

import string
for char in string.ascii_lowercase:
    print char

for c in map(chr, xrange(97, 123)):
   print c