Details and differences of % r and % s in Python, and details of python % r % s

Details and differences of % r and % s in Python, and details of python % r % s

Explanation of % r and % s in Python

% R uses the rper () method to process objects
% S use the str () method to process objects

In some cases, the two processes the same result, for example, processing an int-type object.

Example 1:

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

Returned results:

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 

Returned results:

I said: I am 22 years old .. I said: 'I am 22 years old.'. // % r adds single quotes to the string

Let's look at another situation.

Example 3:

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

Returned results:

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

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

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