python %r %s %d 用法和区别

#!/usr/local/python/bin/python
# -*-coding=utf8 -*-

x = "weiruoyu"
y = 25.66

print "%s" %x
print "%s" %y
print "=========="

print "%r" %x
print "%r" %y

print "=========="
print "%d" %y
print "%d" %x

输出结果：

weiruoyu
25.66
==========
‘weiruoyu‘
25.66
==========
25
Traceback (most recent call last):
  File "/tmp/testpy/tmp.py", line 17, in ?
    print "%d" %x
TypeError: int argument required

Process finished with exit code 1

%d不能读取字符串，删除最后一行就可以了。输出结果如下：

weiruoyu
25.66
==========
‘weiruoyu‘
25.66
==========
25

下面案例还是有一些小区别：

>>> import datetime
>>> d = datetime.date.today()
>>> print ‘%s‘ % d
2018-11-22
>>> print ‘%r‘ % d 
datetime.date(2018, 11, 22)

python %r %s %d 用法和区别

原文：http://blog.51cto.com/weiruoyu/2320781