table of Contents
String str built-in method
Role: Name
Defined manner: single quote / double quotes / three single quotation / three double quotes
Instructions
Priority control (you have to master today)
index
s = 'nick handsome'
print(s[1])Index sliced
print(s[0:4]) # 顾头不顾尾
print(s[0:4:2]) # 2表示步长，隔一个取一个
print(1, s[4:0:-1]) # +从左到右，-表示从右到左
print(1, s[2:]) # 左边的不写取到最左边，右边的不写取到最右边for loop
Member operator
strip () # default ends removal space, can specify the character removed, the plurality of characters can be specified simultaneously removed
s1 = 'a nick ******'
print(s1.strip())
print(s1.strip(' kc*')) # 可以乱序，但是不能没有split () # cut
s2 = 'nick|123658|180|140'
print(s2.split('|')) # 按照|切割字符串，得到的是一个列表len length
s1 = 'nick handsome'
print(len(s1))Need to know (within grasp one week)
lstrip&rstrip
s3 = '**nick**'
print(s3.lstrip('*'))
print(s3.rstrip('*'))lower&upper
s3 = 'Nick'
print(s3.lower()) # 小写
print(s3.upper()) # 大写startswith&endswith
s4 = 'nick handsome'
print(s4.startswith('nick')) # 以。。。开始
print(s4.endswith('some')) # 以。。。结束rsplit
s = 'nick|handsome|180|140|'
print(s.split('|',1))
print(s.rsplit('|',1)) # 从右切割join
s = 'nick|handsome|180|140'
lt = s.split('|')
print(' * '.join(lt)) # 使用*拼接列表内的每一个元素Results: Nick Handsome 180 [140 *
replace
s = 'nick handsome'
s = s.replace('nick','nick chen')
print(s)isdigit/isalpha
s = 'a123123'
print(s.isdigit()) # 判断字符串内字符是否都为数字s = 'askdlfj234'
print(s.isalpha())pwd = input('请输入你的密码：')
if not pwd.isdigit():
print('请输入纯数字')Understand (see verses can line)
find|rfind|index|rindex|count
s = 'nick handsome'
print(s.find('h')) # 找索引, 返回-1表示没找到
print(s.rfind('h',6,10) # 6和10限定了索引序号范围
print(s.index('h'))
print(s.index('sadf')) # 找不到报错
print(s.find('sadf')) # 找不到返回-1s = 'aaaaacccc'
print(s.count('a'))Center | bright | rjust | zfill
s = 'nick'
print(s.center(50,'*')) # 居中
print(s.ljust(50,'*'))
print(s.rjust(50,'*'))
s = '111'
print(s.zfill(8))expandtabs
\ N newline
\ T indentation
s = 'a\t\t\t\ta'
print(s)
print(s.expandtabs(18))captalize | swapcase | title
s = 'nickNick handsome'
print(s.capitalize()) # 首字母大写
print(s.swapcase())
print(s.title()) # 每个单词的首字母大写It is series:
Ordered
Immutable
s = 'nick'
print(id(s))
s += 'nick'
print(id(s))