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##90 字符串
什么是字符串?
具有特殊意义的一些字符拼接在一起的串 字符定义? 单引号 双引号 三引号 str() s= str("")常用方法:
’capitalize’, ‘casefold’, ‘center’, ‘count’, ‘encode’, ‘endswith’, ‘expandtabs’, ‘find’, ‘format’, ‘format_map’, ‘index’, ‘isalnum’, ‘isalpha’, ‘isascii’, ‘isdecimal’, ‘isdigit’, ‘isidentifier’, ‘islower’, ‘isnumeric’, ‘isprintable’, ‘isspace’, ‘istitle’, ‘isupper’, ‘join’, ‘ljust’, ‘lower’, ‘lstrip’, ‘maketrans’, ‘partition’, ‘removeprefix’, ‘removesuffix’, ‘replace’, ‘rfind’, ‘rindex’, ‘rjust’, ‘rpartition’, ‘rsplit’, ‘rstrip’, ‘split’, ‘splitlines’, ‘startswith’, ‘strip’, ‘swapcase’, ‘title’, ‘translate’, ‘upper’, 'zfill’capitalize() ------------- 格式化字符串,将首字母大写
s = ("this is string")s.capitalize()结果:This is string
center() -----------------设置字符串居中*
s = ("center")s.center(50,"*")结果:'**********************center**********************'
count()----------------- 统计字符的个数
s = ("this is string")s.count("s")结果:3
endswith()------------判断字符是不是xxxxx为结尾
s = ("this is string")s.endswith("string")结果:True
startswith()--------------判断字符串是不是以xxxxx为开头
s = ("this is string")s.stratswith("string")结果:False
index() ------------- 查找字符或者符串在字符串第一次出现的位置,如果查找的字符或者字符串没 有会抛出异常
s = ("this is string")s.index("s")3
rindex()--------从右往左查找,查找字符或者符串在字符串第一次出现的位置,如果查找的字符或 者字符串没有会抛出异常
s = ("this is string")s.rindex("s")8
find()--------查找字符或者符串在字符串第一次出现的位置,如果不存在返回是-1
s = ("this is string")s.find("0")-1
rfind()-----------从右往左查找,查找字符或者符串在字符串第一次出现的位置,如果不存在返回是-1
rfind (-1)== rindexs = ("this is string")s.rfind("s")8
encode() -------- Python3 将字符串转换为字节 ,decode() --------将字节转换为字符串
s = ("this is string")s.encode()b 'this is string'
format()------
s = ("this is string")s.format()'this is string'
‘isalnum’, ‘isalpha’, ‘isascii’, ‘isdecimal’, ‘isdigit’, ‘isidentifier’, ‘islower’, ‘isnumeric’, ‘isprintable’,
‘isspace’, ‘istitle’, ‘isupper’islower() -------- 判断字符串是否都是小写字母
s = ("this is string")s.islower()True
isupper()---------判断字符串是否都是大写字母
s = ("this is string")s.isupper()False
istitle()----------判断字符串是否是标题
s = ("this is string")s.istitle()False
title()--------- 将字符串转换为标题
s = ("this is string")s.title()This Is String
isspace() ------- 判断字符串是否为空格位
s = ("this is string")s.isspace()Falses = (" ")s.isspace()True
isdigit()------- 判断字符串是否为数字
s = ("this is string")s.isdigit()Falses = ("12345")s.isdigit()True
isalnum()-----判断字符串是否为数字,判断是否有有效字符
s = ("this is string")s.isalnum()Falses = ("this2009")s.isalnum()Trues = ("this 2009")s.isalnum()False
isalpha()------ 判断字符串是否都是字母
s = ("this is string")s.isalpha()Falses = ("thisisstring")s.isalpha()Trues = ("this2009")s.isalpha()Falses = ("this 2009")s.isalpha()False
strip() ------- 去掉字符串两侧空格
s = (" this is string ")s.isalpha()"this is string"
rstrip()----去掉右空格
lstrip()----去掉左空格replace(“原字符串”,“新字符串”)
s = ("this is string")s.replace("is","get")'thget get string'
rjust()----调整长度必须大于字符串长度
s = ("this is string")s.rjust(25,"*")'***********this is string'
ljust()
split(“符号”) -----------分割字符串,返回结果的是列表 join()--------- 按照特定的符号将可迭代的容器拼接成字符串转载地址:http://satki.baihongyu.com/