1、单引号与双引号用于单行，功能上是等价的。

   　两者配合使用，减少使用转义符。

  例如：　等价的

　　　print "I LOVE 'CHINA'"

　　　print 'I LOVE \'CHINA\''

２、三引号用于多行，内部不使用转移符，原样输出。

　　print ''' I LOVE 'CHINA'   '''（等价）

示例:

days="Mon Tue Wed Thu Fri Sat Sun"

months="Jan\nFeb\nMar\nApr\nMay\nJun\nJul\nAug"

print "Here are the days:",days

print "Here are the months:",months

print """

There's something going on here.

with the three double-quotes.We'll be able to type as much as we like Even 4 lines if we want or 5,or 6"""