A brief introduction to %r and %s in Python

%r uses the rper() method to process the object

%s uses the str() method to process the object

In some cases, the results of the two processes are the same For example, dealing with int type objects.

Example 1:

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

Return result:

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

In other cases, the two are different

Example 2:

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

Return result:

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

Look at another situation

Example 3:

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

Return result:

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

It can be seen that %r can be reproduced when printing The object it represents (rper() unambiguously recreate the object it represents)

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