TypeError: 'str' object does not support item assignment
>>> word[2:] = 'py'
......>>> s.find("dog")
11
>>> s.find("dog",12,len(s)-1)
28
>>> s.find("dog",12,20)
-1
str.rfind(sub[, start...{}'.format(name,fruit)
my name is StivenWang,I like apple
>>> print 'my name is {1},I like {0}'.format...(fruit,name)
my name is StivenWang,I like apple
>>> print 'my name is {mingzi},I like{shuiguo}'.format...文本是有编码的 (utf-8, gbk, GB18030等)
字节没有编码这种说法
文本的编码指的是字符如何使用字节来表示
Python3字符串默认使用utf-8编码
>>> s = '刘亦菲'
>>
