%r用rper()方法处理对象

%s用str()方法处理对象

有些情况下，两者处理的结果是一样的，比如说处理int型对象。

例一：

print "I am %d years old." % 22
print "I am %s years old." % 22
print "I am %r years old." % 22

I am 22 years old.
I am 22 years old.
I am 22 years old.

例二：

text = "I am %d years old." % 22
print "I said: %s." % text
print "I said: %r." % text

I said: I am 22 years old..
I said: ‘I am 22 years old.‘. // %r 给字符串加了单引号

例三：

import datetime
d = datetime.date.today()
print "%s" % d
print "%r" % d

2014-04-14
datetime.date(2014, 4, 14)

参考：http://*.com/questions/6005159/when-to-use-r-instead-of-s-in-python

python中%r和%s的区别,布布扣,bubuko.com

python中%r和%s的区别