字符串是要用引号（双引号，单引号，多行用三个引号）引起来
you have to specify multiple arguments as tuple, eg
print "%d %s of beer on the wall," % (bottles, s1)
s.strip().lstrip().rstrip(‘,‘)
sStr1 = ‘strcat‘ sStr2 = ‘append‘ sStr1 += sStr2 print sStr1
>>> s = ‘s‘ >>> s2 = ‘s2 %s‘ % s >>> s2 ‘s2 s‘
原文：http://www.cnblogs.com/ghgyj/p/4007205.html