%r和%s的区别

理解%r和%s的区别

%r会重现所表达的对象，%s会将所有转成字符串

eg1:

print('i am %s years old' % 22) print('i am %r years old' % 22)

>>>>>>>>>>>>>>>>>>>>>>>>

i am 22 years old i am 22 years old

eg2:

t = 'i am %d years old' % 22 print('i said %s' % t) print('i said %r' % t)

>>>>>>>>>>>>>>>>>>>>>>>>

i said i am 22 years old i said 'i am 22 years old'

eg3:

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

>>>>>>>>>>>>>>>>>>>>>>>>

2017-6-26 datetime.date(2017, 6, 26)