python之路 第二篇 数据类型详解及其方法

Posted 2021-01-12 majian1992

字符串

#作用：描述名字，性别，国籍，地址等信息

#定义：在单引号双引号三引号内，由一串字符组成

name=‘Matthew‘

#优先掌握的操作：
#1、按索引取值(正向取+反向取) ：只能取
#2、切片(顾头不顾尾，步长)
#3、长度len
#4、成员运算in和not in

#5、移除空白strip
#6、切分split
#7、循环

 用法实例

#strip
name = ‘**Matthew*‘
print(name.strip(*))
print(name.lstrip(*))
print(name.rstrip(*))

#lower,upper
name = ‘Matthew‘
print(name.lower())
print(name.upper())

#startwith,endwith
name = ‘Matthew‘
print(name.endwith(‘w‘))
print(name.startwith(‘M‘))

#format
res = ‘{},{},{}‘.format(‘Matthew‘,18,‘male‘)
res = ‘{0},{1},{0}‘.format(‘Matthew‘,18,‘male‘)
res = ‘{name},{age},{sex}‘.format(name=‘Matthew‘,age=18,sex=‘male‘)

#split
name = ‘Matthew_male‘
name.split(‘_‘)

#join
tag = ‘‘
print(tag.join({‘Matthew‘,‘say‘,‘hello‘,‘world‘})

#replace
msg = ‘Alex is a boy‘
print(msg.replace(‘boy‘,‘girl‘))