基础篇7-基本数据类型1.3

• replace()

#a没有变
a = 'this is a dog'
b = a.replace('this', 'that')

• find()

x = a.find('dog')#x = 10
y = a.find('asfdf')#y = -1

• format()

'this is {1} {0}'.format('world', 'my')
'this is {whose} {fruit}'.format(fruit = 'apple', whose = 'my')

• %

a = 'this is %(whose)s %(fruit)s' % {'fruit':'apple', 'whose':'my'}