描述

endswith()方法用于推断字符串是或不是以钦命后缀结尾,如果以钦命后缀结尾再次回到True,不然再次回到False。可选参数”start”与”end”为搜索字符串的启幕与甘休地点。

str字符串常用方法,str字符串

描述

find(卡塔尔 方法检验字符串中是或不是含有子字符串 str ,要是钦赐 beg(开端) 和
end(甘休)
范围,则检查是或不是带有在内定范围内,假诺内定范围内若是带有内定索引值,再次来到的是索引值在字符串中的开始地方。若是不富含索引值,再次来到-1。

Python字符串str的方法运用,python字符串str

#!usr/bin/env python
# -*-coding:utf-8-*-
#字符串通常用双引号或单引号来表示:'123',"abc","字符串"
#str字符串的常用方法有以下:字符串可以用于赋值临时变量s
#友情提示以下全是python2.x版本演示,python3.x请在print(放入测试打印),例如:print(len(s))
from string import maketrans
s3 = '123'
s2 = '   '
s1 = 'This Is \t Cash'
s='abcdefghijklmnopqrstuvwxyz'
s4 = "0000000this is string example....wow!!!0000000"
s5 = 'ab c\n\nde fg\rkl\r\n'
print s[0:6]    #切片,截取字符串中的一段(以下标的起始位置到结束位置)
print len(s)    #统计字符串的长度
print s.ljust(50,'0'),'--->ljust方法'   #返回一个原字符串右用字符串0填充左对齐并宽度50的新字符串
print s.rjust(50,'0'),'--->rjust方法'   #返回一个原字符串左用字符串0填充右对齐并宽度50的新字符串
print s.capitalize(),'--->capitalize方法'    #返回字符串首字母大写的副本
print s.center(50,'*'),'--->center方法'  #表示原字符串居中两边填充宽度的用法
print format(s, '.3'),'--->format方法'   #格式化输出也可当切片用的方式
print s.upper(),'--->upper方法' #将小写字母转换成大写字母
print s.lower(),'--->lower方法' #将大写字母转换成小写字母
print s3.isdigit(),'--->isdigit方法'   #判断字符串如果是数字返回真True,不是返回假False
print s.startswith('abc'),'--->startswith方法'   #判断字符串是否是以abc开头如果是返回真,否则返回假
print s.endswith('zz'),'--->endswith方法'  #判断字符串是否以yz结尾是返回真,否则返回假
print s1.expandtabs(),'--->expandtabs方法'   #把字符串中的 tab 符号('\t')转为空格,tab 符号('\t')默认的空格数是8
print s.isalnum(),'--->isalnum方法'   #判断字符串至少有一个字符并且所有字符都是字母或数字则返回 True,否则返回 False
print s.isalpha(),'--->isalpha方法'   #判断字符串至少有一个字符并且所有字符都是字母则返回 True,否则返回 False
print s2.isspace(),'--->isspace方法'  #判断字符串中只包含空格,则返回 True,否则返回 False
print s1.istitle(),'--->istitle方法'   #如果字符串中所有的单词拼写首字母是否为大写,且其他字母为小写则返回 True,否则返回 False
print s4.strip("0"),'--->strip方法' #返回移除字符串头尾指定的字符生成的新字符串
print s.find('sd'),'--->find方法'   #检查是否包含在指定范围内,如果包含子字符串返回开始的索引值,否则返回-1。
print s.index('s'),'--->index方法'  #检查是否包含在指定范围内,该方法与find()方法一样,只不过如果不在字符串中会报一个异常
print s.partition("k"),'--->partition方法'  #生成一个分隔符k,第一个为分隔符左边的子串,第二个为分隔符本身,第三个为分隔符右边的子串。
print s1.swapcase(),'--->swapcase方法' #返回大小写字母转换后生成的新字符串
print s5.splitlines(),'--->splitlines方法'   #返回一个包含各行作为元素的列表
print s2.join(s3),'--->join方法'   #返回通过指定字符连接序列中元素后生成的新字符串
print s3.translate(maketrans(s3,s2)) #返回翻译后的字符串(有点复杂)自信百度补脑
print s3.zfill(10),'--->zfill方法'  #返回指定宽度的字符串原字符串右对齐,前面填充0
#以下打印输出:

金沙国际官网 1

#!usr/bin/env python # -*-coding:utf-8-*-
#字符串日常用双引号或单引号来代表:’123′,”abc”,”字符串”
#str字符串…

描述

Python
casefold(卡塔尔(قطر‎方法是Python3.3本子之后引进的,其职能和 lower() 方法拾分相通,都得以转变字符串中颇负大写字符为小写。

互相的区分是:lower(卡塔尔(英语:State of Qatar)方法只对ASCII编码,也正是‘A-Z’有效,对于任何语言(非中文或乌克兰(УКРАЇНА卡塔尔(قطر‎语)中把大写转变为小写的意况只好用
casefold(卡塔尔(قطر‎ 方法。

语法

endswith(卡塔尔(قطر‎方英文法:

str.endswith(suffix[, start[, end]])

    字符串是编制程序中常用的体系,字符型在内存中是以单个格局积存的,比如name

“alex”,在内部存储器中存款和储蓄的格局为[“a”,”l”,”e”,”x”],因而大家得以接纳列表的多多功用来操作字符串,因为小编早先的时候一贯在想干什么字符串能够应用切成块,能够有目录,起头的时候平素不明了,后来晓得了Python字符串的仓库储存格局之后才晓得为啥存在这么些艺术。上面大家来走访字符串类型中隐含那个方法:

   
在Python中大略措施下边有注释,那是因为那一个情势应用Python自个儿编排的,大家清楚Python中好些个是一向调用C语言中的方法,看不到的那八个是C语言中的方法。

    1.capitalize(self)

    def capitalize(self): # real signature unknown; restored from
__doc__
    ”””
    S.capitalize() -> str
        首字母大写,只是第二个居首第3个首字母大写
    Return a capitalized version of S, i.e. make the first
character
    have upper case and the rest lower case.
    ”””
    return “”

   
capitalize(self卡塔尔是居首首字母大写,大家精晓还会有三个办法title(卡塔尔(英语:State of Qatar),上面来相比那七个形式的分化点:

    >>> name = “alex is sb”
  >>> name.capitalize()
  ’Alex is sb’
  >>> name.title()
  ’Alex Is Sb’

   
从地点能够看出,capitalize(self卡塔尔是位居第4位首字母大写,其余字母非常的小写;而title(self卡塔尔国方法是兼具单词的首字母都大写,那一个在用的时候要领悟是要求那么字母大写。

    2.casefold(self)

    def casefold(self): # real signature unknown; restored from
__doc__
    ”””
    S.casefold() -> str
        全体首字母小写,等价于lower(卡塔尔国
    Return a version of S suitable for caseless comparisons.
    ”””
    return “”

    casefold(self卡塔尔是将大写字母转变为小写,等价于lower(self卡塔尔国,实比如下:

    >>> name = “ALEX Is SB”
  >>> name.casefold()
  ’alex is sb’
  >>> name
  ’ALEX Is SB’
  >>> name.lower()
  ’alex is sb’

  3.center(self,width,fillchar=None)

    def center(self, width, fillchar=None): # real signature unknown;
restored from __doc__
    ”””
    S.center(width[, fillchar]) -> str
       
“””center(self,width,fillchar=None卡塔尔(英语:State of Qatar)是将字符串放到中间,两边加上任性符号,暗中同意空格”””
    Return S centered in a string of length width. Padding is
    done using the specified fill character (default is a space)
    ”””
    return “”

   
center(self,width,fillchar=None卡塔尔国,美化格式,把self放到中间,内定任性长度的字符,空白处用字符填充,暗中认可时间和空间字符。示举个例子下:

    >>> name = “您好”
金沙国际官网,  >>> name.center(12)
  ’     您好     ‘
  >>> name.center(12,”-“)
  ’—–您好—–‘

    4.__format__(self,format_spec)

    def __format__(self, format_spec): # real signature unknown;
restored from __doc__
    ”””
    S.__format__(format_spec) -> str
        字符串的格式化
    Return a formatted version of S as described by format_spec.
    ”””
    return “”

   
__format__(self,format_spec卡塔尔国字符串举行格式化,根据大家必要的格式进行字符串格式化操作。详细可参照()

    >>> tp1 = “My name is {0},and I am {1} years old,I am
{2}”

  >>> tp1.format(“Alex”,”18″,”sb”)

    ‘My name is Alex,and I am 18 years old,I am sb’

    >>> tp2 = “I am {1} years old,my name is {2},and I am
{0}.”

  >>> tp2.format(“sb”,”18″,”Alex”)
  ’I am 18 years old,my name is Alex,and I am sb.’
   
这种方法也足以用在字符串的拼接上边,使用字符串的format(卡塔尔国方法,在{}大括号中定义索引,告诉Python把哪些值传给索引位置。

    5.__getattribute__(self,*args,**kwargs)

    def __getattribute__(self, *args, **kwargs): # real
signature unknown
    ””” Return getattr(self, name). “””

        “””反射的时候用的”””
    pass

    6.__getitem__(self,*args,**kwargs)

    def __getitem__(self, *args, **kwargs): # real signature
unknown
    ””” Return self[key]. “””

    ”””获得字符串低档个成分,等价于self[key]”””
    pass  

   
正是收获字符串中第多少个职位的字符,大家清楚字符串在内部存款和储蓄器中是以列表情势积累的,因而得以使用索引来获取单个字符,实比方下:

    >>> name = “Alexissb”
  >>> name.__getitem__(2)
  ’e’
  >>> name[2]
  ’e’
    字符串中索引是从0最早的,获取字符串中第多少个岗位的字符。

    7.__getnewargs__(self,*args,**kwargs)

    def __getnewargs__(self, *args, **kwargs): # real signature
unknown

    ”””__getnewargs__是跟参数有关的”””
    pass

    8.__hash__(self,*args,**kwargs)

    def __hash__(self, *args, **kwargs): # real signature
unknown
    ””” Return hash(self). “””
    pass   

    9.__iter__(self,*args,**kwargs)

    def __iter__(self, *args, **kwargs): # real signature
unknown
    ””” Implement iter(self). “””
    pass

    10.__len__(self,*args,**kwargs)

    def __len__(self, *args, **kwargs): # real signature
unknown
    ””” Return len(self). “””

        “””重返字符串的长度,等价与len(self卡塔尔国”””
    pass

    实举例下:

    >>> name = “Alexissb”
  >>> name.__len__()
  8
  >>> len(name)
  8
    11.count(self,sub,start=None,end=None)
    def count(self, sub, start=None, end=None): # real signature
unknown; restored from __doc__
    ”””
    S.count(sub[, start[, end]]) -> int

        再次来到在字符串中冒出钦点字符的个数,重临叁个整数

    Return the number of non-overlapping occurrences of substring
sub in
    string S[start:end]. Optional arguments start and end are
    interpreted as in slice notation.
    ”””
    return 0

   
count(self,sub,start=None,end=None卡塔尔(英语:State of Qatar)是用来计算字符串中冒出一定字符的个数,重临叁个板寸,实比方下:

    >>> name = “Alexssbbafadgcxlsdgpssl”
    >>> name.count(“a”)
  2
    >>> name.count(“D”)
  0
    总结字符串中冒出钦点字符的个数,当官样文章的时候再次回到0。

    12.encode(self,encoding=’utf-8′,errors=’strict’)

    def encode(self, encoding=’utf-8′, errors=’strict’): # real
signature unknown; restored from __doc__
    ”””
    S.encode(encoding=’utf-8′, errors=’strict’) -> bytes
        编码
    Encode S using the codec registered for encoding. Default
encoding
    is ‘utf-8’. errors may be given to set a different error
    handling scheme. Default is ‘strict’ meaning that encoding
errors raise
    a UnicodeEncodeError. Other possible values are ‘ignore’,
‘replace’ and
    ’xmlcharrefreplace’ as well as any other name registered with
    codecs.register_error that can handle UnicodeEncodeErrors.
    ”””
    return b””

    实比如下:

    >>> name = “李杰”
  >>> name.encode(“gbk”)
  b’\xc0\xee\xbd\xdc’
    将字符串转变为”gbk”格式,机器度和胆识其他格式。

    13.endswith(self,suffix,start=None,end=None)

    def endswith(self, suffix, start=None, end=None): # real signature
unknown; restored from __doc__
    ”””
    S.endswith(suffix[, start[, end]]) -> bool
       
字符串是或不是以内定的字符停止,endswith(self,suffix,start=None,end=None卡塔尔(英语:State of Qatar)
    Return True if S ends with the specified suffix, False
otherwise.
    With optional start, test S beginning at that position.
    With optional end, stop comparing S at that position.
    suffix can also be a tuple of strings to try.
    ”””
    return False

   
endswith(self,suffix,start=None,end=None卡塔尔国决断字符串以有些钦点的字符甘休,要是是,则赶回布尔值True;不然再次回到False。

    >>> name = “Alexsssbdfgedlmnopqqsstabsc”
  >>> name.endswith(“c”)
  True
  >>> name.endswith(“s”,0,5)
  True
    14.expandtabs(self,tabsize=8)

    def expandtabs(self, tabsize=8): # real signature unknown; restored
from __doc__
    ”””
    S.expandtabs(tabsize=8) -> str
       
将字符串中的tab键转变为空格,暗中认可时8个任务的空格,能够和睦安装参数
    Return a copy of S where all tab characters are expanded using
spaces.
    If tabsize is not given, a tab size of 8 characters is
assumed.
    ”””
    return “”

   
expandtabs(self,tabsize=8卡塔尔(英语:State of Qatar)将字符串中的tab(\t卡塔尔将中间转播为空格,暗许是转账为8个空格,能够本人安装转化为几个空格。示比如下:

    >>> user = ”    Alex”
  >>> user.expandtabs()
  ’        Alex’
  >>> user.expandtabs(2)
  ’  Alex’
  >>> user.expandtabs(0)
  ’Alex’
  >>> user.expandtabs(tabsize=3)
  ’   Alex’
    15.find(self,sub,start=None,end=None)

    def find(self, sub, start=None, end=None): # real signature
unknown; restored from __doc__
    ”””
    S.find(sub[, start[, end]]) -> int
       
查找钦赐字符在字符串中之处,重返地点索引,假诺搜索不到,则赶回-1(return
-1 on failure卡塔尔(英语:State of Qatar)
    Return the lowest index in S where substring sub is found,
    such that sub is contained within S[start:end]. Optional
    arguments start and end are interpreted as in slice notation.

    Return -1 on failure.
    ”””
    return 0
   
find(self,sub,start=None,end=None卡塔尔(英语:State of Qatar)查找钦赐字符在字符串中的地点,假如搜索不到,则赶回-1(即查找字符空中楼阁钦点字符串中卡塔尔(قطر‎,示举个例子下:

    >>> name
  ’Alexsssbdfgedlmnopqqsstabsc’
  >>> name.find(“s”)
  4
  >>> name.find(“s”,8,len(name)-1)
  20
  >>> name.find(“S”)
  -1
   
find(self,sub,start=None,end=None卡塔尔(قطر‎查找那个字符第一回面世的岗位索引。只查找第三个岗位索引,查找未果重临-1.
    16.index(self,sub,start=None,end=None)

    def index(self, sub, start=None, end=None): # real signature
unknown; restored from __doc__
    ”””
    S.index(sub[, start[, end]]) -> int
       
    Like S.find() but raise ValueError when the substring is not
found.
    ”””
    return 0

     
index(self,sub,start=None,end=None卡塔尔(قطر‎跟find(卡塔尔(英语:State of Qatar)相同是探求钦命字符在字符串中的地点索引,分裂的是,若是index(卡塔尔(قطر‎查找未果,则报错。查究不到报错。 
示举个例子下:

     >>> name
  ’Alexsssbdfgedlmnopqqsstabsc’
  >>> name.index(“s”)
  4
  >>> name.index(“s”,8,len(name)-1)
  20
  >>> name.index(“S”)
  Traceback (most recent call last):
     File “<stdin>”, line 1, in <module>
  ValueError: substring not found    
下边可以看看,index(卡塔尔(قطر‎和find(卡塔尔国是黄金时代致的,都以回去寻觅字符的岗位索引,可是当index(卡塔尔查找不到的时候会报错。

    17.format_map(self,mapping)

    def format_map(self, mapping): # real signature unknown; restored
from __doc__
    ”””
    S.format_map(mapping) -> str

    Return a formatted version of S, using substitutions from
mapping.
    The substitutions are identified by braces (‘{‘ and ‘}’).
    ”””
    return “”

    18.isalnum(self)

    def isalnum(self): # real signature unknown; restored from
__doc__
    ”””
    S.isalnum() -> bool
       推断字符串中颇有的字符是不是都以字符数字组成
    Return True if all characters in S are alphanumeric
    and there is at least one character in S, False otherwise.
    ”””
    return False
   
示比方下:决断字符串中是还是不是具备因素唯有数字和字母组成,alnum是单词阿尔法numeric的缩写,字母数字
    >>> name.isalnum()
  True
  >>> nums = “2233”
  >>> nums.isalnum()
  True

    19.isalpha()

    def isalpha(self): # real signature unknown; restored from
__doc__
    ”””
    S.isalpha() -> bool
        决断字符串中持有的因素是或不是都以字母组成
    Return True if all characters in S are alphabetic
    and there is at least one character in S, False otherwise.
    ”””
    return False

   
决断字符串全体字符是或不是都以字母alpha是单词alphabetic(字母)的缩写:  

>>> nums = “2233”
  >>> name.isalpha()
  True
  >>> nums.isalpha()
  False
    20.isdecimal(self)

    def isdecimal(self): # real signature unknown; restored from
__doc__
    ”””
    S.isdecimal() -> bool
       
假设字符串中值包罗十进制的数字,则赶回True;不然重返布尔值False.
    Return True if there are only decimal characters in S,
    False otherwise.
    ”””
    return False

   
isdecimal(self卡塔尔(قطر‎判别字符串中是否只包含十进制的数字,借使是,则赶回True;不然再次来到False。示举个例子下:

    >>> s1 = “a122”
  >>> s2 = “222”
  >>> s3 = “&b#s”
  >>> s1.isdecimal()
  False
  >>> s2.isdecimal()
  True
  >>> s3.isdecimal()
  False
    21.isdigit(self)
    def isdigit(self): # real signature unknown; restored from
__doc__
    ”””
    S.isdigit() -> bool
        判断字符串是还是不是只有由数字构成
    Return True if all characters in S are digits
    and there is at least one character in S, False otherwise.
    ”””
    return False

   
isdigit(self卡塔尔(قطر‎剖断字符串中是还是不是唯有满含数字,即由数字组成的字符串。实比方下:

    >>> s1 = “a122”
  >>> s2 = “222”
  >>> s3 = “&b#s”

    >>> s1.isdigit()
  False
  >>> s2.isdigit()
  True
  >>> s3.isdigit()
  False
    22.isidentifier(self)

    def isidentifier(self): # real signature unknown; restored from
__doc__
    ”””
    S.isidentifier() -> bool

    Return True if S is a valid identifier according
    to the language definition.

    Use keyword.iskeyword() to test for reserved identifiers
    such as “def” and “class”.
    ”””
    return False

    isidentifier(self卡塔尔(قطر‎,实例如下:

    >>> s2 = “Alex”
  >>> s3 = “list”
  >>> s2.isidentifier()
  True
  >>> s3.isidentifier()
  True
  >>> s4 = “55”
  >>> s4.isidentifier()
  False
  >>> s5 = “gengcx”
  >>> s5.isidentifier()
  True

    23.islower(self)

    def islower(self): # real signature unknown; restored from
__doc__
    ”””
    S.islower() -> bool
        判定是还是不是都是小写
    Return True if all cased characters in S are lowercase and
there is
    at least one cased character in S, False otherwise.
    ”””
    return False

    islower(self卡塔尔(قطر‎判定字符串是不是都以小写,

    >>> s1 = “Alex”
  >>> s2 = “23abc”
  >>> s3 = “alex”
  >>> s4 = “AlexSb&&”
  >>> s5 = “a%@”
  >>> s1.islower()
  False
  >>> s2.islower()
  True
  >>> s3.islower()
  True
  >>> s4.islower()
  False
  >>> s5.islower()
  True
    24.isnumeric(self)

    def isnumeric(self): # real signature unknown; restored from
__doc__
    ”””
    S.isnumeric() -> bool

    Return True if there are only numeric characters in S,
    False otherwise.
    ”””
    return False

   
isnumeric(self卡塔尔(قطر‎推断字符串S中是或不是值蕴含数字在里边,即便是,重回True;不然再次来到False.

    >>> name = “Alex222”
  >>> nums = “234239”
  >>> num = “23se”
  >>> l1 = “2.35”
  >>> name.isnumeric()
  False
  >>> nums.isnumeric()
  True
  >>> num.isnumeric()
  False
  >>> l1.isnumeric()
  False
    25.isprintable(self)

    def isprintable(self): # real signature unknown; restored from
__doc__
    ”””
    S.isprintable() -> bool
      
判别几个字符串是不是里面包车型大巴字符都是能够打字与印刷出来的依旧字符串是空的,若是是回到True;不然重回False
    Return True if all characters in S are considered
    printable in repr() or S is empty, False otherwise.
    ”””
    return False

    isprintable(self) 

    >>> name = ”    Alex”
  >>> name.isprintable()
  False
  >>> user = “Alex”
  >>> user.isprintable()
  True

    >>> s1 = “”
    >>> s1.isprintable()
  True
    isprintable(s1卡塔尔(قطر‎中s1是空的字符串,然而也回到True.
    26.isspace(self)

    def isspace(self): # real signature unknown; restored from
__doc__
    ”””
    S.isspace() -> bool
        判别字符串中是否都以空白
    Return True if all characters in S are whitespace
    and there is at least one character in S, False otherwise.
    ”””
    return False

   
isspace(self卡塔尔(英语:State of Qatar)剖断字符串中是还是不是都以空白,即便是回去True;不然重临False。示举例下:

    >>> s1 = ”    “
  >>> s2 = ”       “
  >>> s3 = “cs   “
  >>> s1.isspace()
  True
  >>> s2.isspace()
  True
  >>> s3.isspace()
  False
    27.istitle(self)

    def istitle(self): # real signature unknown; restored from
__doc__
    ”””
    S.istitle() -> bool
        决断字符串中享有字符是不是是首字母大写格局,倘使是回到True
    Return True if S is a titlecased string and there is at least
one
    character in S, i.e. upper- and titlecase characters may only
    follow uncased characters and lowercase characters only cased
ones.
    Return False otherwise.
    ”””
    return False

   
istitle(self)认清是不是首字母大写,尽管是回去True;不然再次回到False。实比方下:

    >>> s1 = “Alex is sb”
  >>> s2 = “Alex Is Sb”
  >>> s3 = “alex is sb”
  >>> s1.istitle()
  False
  >>> s2.istitle()
  True
  >>> s3.istitle()
  False
    28.isupper(self)

    def isupper(self): # real signature unknown; restored from
__doc__
    ”””
    S.isupper() -> bool
        剖断全体字母是还是不是都以大写
    Return True if all cased characters in S are uppercase and
there is
    at least one cased character in S, False otherwise.
    ”””
    return False
      isupper(self卡塔尔决断字符串中保有字符是还是不是都以大写格局:实举例下:

    >>> s1 = “Alex is sb”
  >>> s2 = “Alex Is Sb”
    >>> s3 = “alex is sb”

    >>> s4 = “ALEX IS SB”
    >>> s1.isupper()
  False
  >>> s2.isupper()
  False
  >>> s3.isupper()
  False

    >>> s4.isupper()
  True

    29.join(self,iterable)

    def join(self, iterable): # real signature unknown; restored from
__doc__
    ”””
    S.join(iterable) -> str
        字符串的拼接,把字符串拼接到一齐
    Return a string which is the concatenation of the strings in
the
    iterable. The separator between elements is S.
    ”””
    return “”
   
join(self,iterable卡塔尔(英语:State of Qatar)拼接,字符串和列表直接的拼接,有两样措施的拼凑,上边来研讨一下:

    >>> sign = “-“
  >>> name = “alex”
  >>> li = [“a”,”l”,”e”,”x”,”s”,”b”]
  >>> l1 = “”
   
1.字符串和字符串举办拼接,将拼接中的字符串的每贰个因素与字符串中的成分举行拼接,即iterable+self+iterable+self… 

  >>sign.join(name)
  ’a-l-e-x’
  >>> name.join(“sb”)
  ’salexb’
  >>> name.join(“issb”)
  ’ialexsalexsalexb’
  2.字符串和列表实行拼接,列表中的每三个成分都与字符串的成分举办拼接:

  >>> sign.join(li)
  ’a-l-e-x-s-b’
  >>> l1.join(li)
  ’alexsb’

   
其实在Python中,字符串存储的格式便是列表存款和储蓄的,例如”alexsb”存款和储蓄就是[“a”,”l”,”e”,”x”,”s”,”b”],由此字符串与列表拼接与字符串与字符串拼接是后生可畏致的。

    30.ljust(self,width,fillchar=None)

    def ljust(self, width, fillchar=None): # real signature unknown;
restored from __doc__
    ”””
    S.ljust(width[, fillchar]) -> str
       固定长度,字符串左侧拼接钦点的字符
    Return S left-justified in a Unicode string of length width.
Padding is
    done using the specified fill character (default is a space).
    ”””
    return “”
    ljust(self,width,fillchar=None卡塔尔,固定长度,self+fillchar,实举个例子下:

    >>> name = “alexsb”
    >>> name.ljust(12,”-“)
  ’alexsb——‘

    31.rjust(self,width,fillchar=None)

    def rjust(self, width, fillchar=None): # real signature unknown;
restored from __doc__
    ”””
    S.rjust(width[, fillchar]) -> str

    Return S right-justified in a string of length width. Padding
is
    done using the specified fill character (default is a space).
    ”””
    return “”
    固定字符串长度,在字符串左边链接钦赐字符,实举个例子下:

    >>> name = “alexsb”   

  >>> name.rjust(12,”-“)
  ’——alexsb’

    32.lower(self)

    def lower(self): # real signature unknown; restored from
__doc__
    ”””
    S.lower() -> str
        将字符串全体转速为小写格局
    Return a copy of the string S converted to lowercase.
    ”””
    return “”
    33.lstrip(self,chars=None)

    def lstrip(self, chars=None): # real signature unknown; restored
from __doc__
    ”””
    S.lstrip([chars]) -> str

    Return a copy of the string S with leading whitespace
removed.
    If chars is given and not None, remove characters in chars
instead.
    ”””
    return “”
   
lstrip(self,chars=None卡塔尔(英语:State of Qatar)是删除字符串左边包车型大巴空格,暗中同意是删除空格,其实能够钦赐删除任何字符,实举个例子下:

    >>> name = ”   AlexAesbb   “
  >>> name.lstrip()
  ’AlexAesbb   ‘

    34.rstrip(self,chars=None)

    def rstrip(self, chars=None): # real signature unknown; restored
from __doc__
    ”””
    S.rstrip([chars]) -> str
        删除字符串侧边的空格
    Return a copy of the string S with trailing whitespace
removed.
    If chars is given and not None, remove characters in chars
instead.
    ”””
    return “”
    rstrip(self,chars=None卡塔尔国删除字符串侧边的空格,实举个例子下:

    >>> name = ”   AlexAesbb   ”   

    >>> name.rstrip()
‘   AlexAesbb’

    35.strip(self,chars=None)

    def strip(self, chars=None): # real signature unknown; restored
from __doc__
    ”””
    S.strip([chars]) -> str

    Return a copy of the string S with leading and trailing
    whitespace removed.
    If chars is given and not None, remove characters in chars
instead.
    ”””
    return “”
     strip(self,chars=None卡塔尔(英语:State of Qatar)删除字符串两边的空格,示举个例子下:

    >>> name = ”   AlexAesbb   ”   

    >>> name.strip()
  ’AlexAesbb’

    36.maketrans(self,*args,**kwargs)

    def maketrans(self, *args, **kwargs): # real signature unknown
    ”””
    Return a translation table usable for str.translate().

    If there is only one argument, it must be a dictionary mapping
Unicode
    ordinals (integers) or characters to Unicode ordinals, strings
or None.
    Character keys will be then converted to ordinals.
    If there are two arguments, they must be strings of equal
length, and
    in the resulting dictionary, each character in x will be mapped
to the
    character at the same position in y. If there is a third
argument, it
    must be a string, whose characters will be mapped to None in
the result.
    ”””
    pass
    37.translate(self,table)

    def translate(self, table): # real signature unknown; restored from
__doc__
    ””
    S.translate(table) -> str

    Return a copy of the string S in which each character has been
mapped
    through the given translation table. The table must implement
    lookup/indexing via __getitem__, for instance a dictionary
or list,
    mapping Unicode ordinals to Unicode ordinals, strings, or None.
If
    this operation raises LookupError, the character is left
untouched.
    Characters mapped to None are deleted.
    ”””
    return “”
    示举个例子下:

    >>> intab = “aeiou”
  >>> outtab = “12345”

    >>> trantab = intab.maketrans(intab,outtab)
  >>> trantab
  {97: 49, 111: 52, 117: 53, 101: 50, 105: 51}

    >>> str = “This is string example …. wow!!!”
    >>> str.translate(trantab)
  ’Th3s 3s str3ng 2x1mpl2 …. w4w!!!’

   
上边代码含义是,把intab中每一个成分与outtab中各类成分风流浪漫风姿浪漫对应,然后translate(卡塔尔(قطر‎替换当中对应的因素。

    38.partition(self,sep)

    def partition(self, sep): # real signature unknown; restored from
__doc__
    ”””
    S.partition(sep) -> (head, sep, tail)
        字符串分隔,以sep分隔为前中后三局地
    Search for the separator sep in S, and return the part before
it,
    the separator itself, and the part after it. If the separator
is not
    found, return S and two empty strings.
    ”””
    pass
   
partition(self,sep卡塔尔(英语:State of Qatar)字符串分隔,以字符串sep分隔为前中后三局部,而且以找到的首先个字符为分隔:

    >>> name = ‘   AlexAesbb   ‘
  >>> name.partition(“x”)
  (‘   Ale’, ‘x’, ‘Aesbb   ‘)
  >>> name.partition(“A”)
  (‘   ‘, ‘A’, ‘lexAesbb   ‘)

    39.replace(self,old,new,count=None)

    def replace(self, old, new, count=None): # real signature unknown;
restored from __doc__
    ”””
    S.replace(old, new[, count]) -> str
        字符串的查找替换
    Return a copy of S with all occurrences of substring
    old replaced by new. If the optional argument count is
    given, only the first count occurrences are replaced.
    ”””
    return “”
   
字符串的轮换,old哪个字符要替换,new替换到什么,count替换多少个,实举个例子下:

    >>> name = ‘   AlexAesbb   ‘
  >>> name.replace(“A”,”M”)
  ’   MlexMesbb   ‘
  >>> name.replace(“A”,”M”,1)
  ’   MlexAesbb   ‘

    字符串的追寻替换,私下认可替换全体,能够钦定替换的个数。

    39.rfind(self,sub,start=None,end=None)

    def rfind(self, sub, start=None, end=None): # real signature
unknown; restored from __doc__
    ”””
    S.rfind(sub[, start[, end]]) -> int
        从右侧初始查找
    Return the highest index in S where substring sub is found,
    such that sub is contained within S[start:end]. Optional
    arguments start and end are interpreted as in slice notation.

    Return -1 on failure.
    ”””
    return 0
    从字符串侧面开头查找,查找钦命字符在字符串中的地点索引:实比方下:

    >>> name = ‘   AlexAesbb   ‘
  >>> name.rfind(“A”)
  7
  >>> name.find(“A”)
  3
  >>> name.rfind(” “)
  14

    从右侧查找钦定字符在字符串中的位置索引,假诺搜索不到再次来到-1.

    40.rindex(self,sub,start=None,end=None)

    def rindex(self, sub, start=None, end=None): # real signature
unknown; restored from __doc__
    ”””
    S.rindex(sub[, start[, end]]) -> int

    Like S.rfind() but raise ValueError when the substring is not
found.
    ”””
    return 0
   
rindex(self,sub,start=None,end=None卡塔尔从字符串侧边查找钦定字符的岗位索引,借使寻找不到就能够报错。

    41.rpartition(self,sep)

    def rpartition(self, sep): # real signature unknown; restored from
__doc__
    ”””
    S.rpartition(sep) -> (head, sep, tail)
        从字符串右边初叶查找分隔
    Search for the separator sep in S, starting at the end of S,
and return
    the part before it, the separator itself, and the part after
it. If the
    separator is not found, return two empty strings and S.
    ”””
    pass
   
rpartition(self,sep卡塔尔(英语:State of Qatar)从字符串侧边发轫查找分隔,与partition(self,sep卡塔尔(قطر‎赶巧相反,示举个例子下,分隔字符串获得一个元组:

    >>> name = ‘   AlexAesbb   ‘
  >>> name.partition(“A”)
  (‘   ‘, ‘A’, ‘lexAesbb   ‘)
  >>> name.rpartition(“A”)
  (‘   Alex’, ‘A’, ‘esbb   ‘)

    42.rsplit(self,sep=None,maxsplit=-1)

    def rsplit(self, sep=None, maxsplit=-1): # real signature unknown;
restored from __doc__
    ”””
    S.rsplit(sep=None, maxsplit=-1) -> list of strings

    Return a list of the words in S, using sep as the
    delimiter string, starting at the end of the string and
    working to the front. If maxsplit is given, at most maxsplit
    splits are done. If sep is not specified, any whitespace
string
    is a separator.
    ”””
    return []
   
rsplit(self,sep=None,maxsplit=-1卡塔尔国分隔字符串,并扭转一个存放的列表,实举例下:

    >>> name = “Alexsbegcex”
  >>> name.split(“e”)
  [‘Al’, ‘xsb’, ‘gc’, ‘x’]
  >>> name.rsplit(“e”)
  [‘Al’, ‘xsb’, ‘gc’, ‘x’]

    >>> name.split(“e”,0)
  [‘Alexsbegcex’]
  >>> name.split(“e”,1)
  [‘Al’, ‘xsbegcex’]
  >>> name.split(“e”,2)
  [‘Al’, ‘xsb’, ‘gcex’]
  >>> name.split(“e”,3)
  [‘Al’, ‘xsb’, ‘gc’, ‘x’]
  >>> name.split(“e”,4)
  [‘Al’, ‘xsb’, ‘gc’, ‘x’]
  >>> name.split(“e”,-1)
  [‘Al’, ‘xsb’, ‘gc’, ‘x’]

   
以钦命字符串分隔,并且替换钦定字符,分隔形成四个列表,能够内定分隔字符的个数。

    43.split(self,sep=None,maxsplit=-1)

    def split(self, sep=None, maxsplit=-1): # real signature unknown;
restored from __doc__
    ”””
    S.split(sep=None, maxsplit=-1) -> list of strings
        分隔字符串,生成二个列表,能够钦赐分隔的次数,私下认可是百分百相隔
    Return a list of the words in S, using sep as the
    delimiter string. If maxsplit is given, at most maxsplit
    splits are done. If sep is not specified or is None, any
    whitespace string is a separator and empty strings are
    removed from the result.
    ”””
    return []
    44.splitlines(self,keepends=None)

    def splitlines(self, keepends=None): # real signature unknown;
restored from __doc__
    ”””
    S.splitlines([keepends]) -> list of strings

    Return a list of the lines in S, breaking at line boundaries.
    Line breaks are not included in the resulting list unless
keepends
    is given and true.
    ”””
    return []
   
splitlines(self,keepends=None)以”\n”换行符的样式分隔字符串,实举例下:

    >>> user = “””
  … alex
  … aoi
  … marry”””

    >>> user.splitlines()
  [”, ‘alex’, ‘aoi’, ‘marry’]

    45.startswith(self,prefix,start=None,end=None)

    def startswith(self, prefix, start=None, end=None): # real
signature unknown; restored from __doc__
    ”””
    S.startswith(prefix[, start[, end]]) -> bool
        字符串是不是以钦命字符开首,可以钦命初始地点
    Return True if S starts with the specified prefix, False
otherwise.
    With optional start, test S beginning at that position.
    With optional end, stop comparing S at that position.
    prefix can also be a tuple of strings to try.
    ”””
    return False
   
startswith(self,prefix,start=None,end=None卡塔尔(قطر‎判定字符串是或不是以钦命字符起先,可以钦点起初地点,与endswith(self,prefix,start=None,end卡塔尔国

恰恰相反,示举个例子下:

    >>> name = ‘Alexsbegcex’
    >>> name.startswith(“A”)
  True
    >>> name.startswith(“w”)
  False

    >>> name.startswith(“e”,2,5)
  True

    46.swapcase(self)

    def swapcase(self): # real signature unknown; restored from
__doc__
    ”””
    S.swapcase() -> str
        将多个字符串中具备大写字符转变为小写,小写调换为题写
    Return a copy of S with uppercase characters converted to
lowercase
    and vice versa.
    ”””
    return “”
   
swapcase(self卡塔尔(قطر‎将多个字符串中负有字符小写转变为大写,大写转变为小写,好贱呀这些情势,实比如下:

    >>> name = ‘Alexsbegcex’
  >>> name.swapcase()
  ’aLEXSBEGCEX’

    47.title(self)

    def title(self): # real signature unknown; restored from
__doc__
    ”””
    S.title() -> str
        将字符串首字母转换为题写
    Return a titlecased version of S, i.e. words start with title
case
    characters, all remaining cased characters have lower case.
    ”””
    return “”
    48.upper(self)

    def upper(self): # real signature unknown; restored from
__doc__
    ”””
    S.upper() -> str
        将字符串全体字母都转移为题写
    Return a copy of S converted to uppercase.
    ”””
    return “”
    49.zfill(self,width)

    def zfill(self, width): # real signature unknown; restored from
__doc__
    ”””
    S.zfill(width) -> str
        钦点宽度,不足左边补零
    Pad a numeric string S with zeros on the left, to fill a
field
    of the specified width. The string S is never truncated.
    ”””
    return “”
    zfill(self,width卡塔尔(英语:State of Qatar)钦赐宽度,不足左侧补0,不然不改变。实譬喻下:

    >>> name = ‘Alexsbegcex’
  >>> name.zfill(20)
  ’000000000Alexsbegcex’
  >>> name.zfill(5)
  ’Alexsbegcex’
    50.__contains__(self,*args,**kwargs)

    def __contains__(self, *args, **kwargs): # real signature
unknown
    ””” Return key in self. “””

        判定字符串中是或不是带有钦命字符
    pass
   
__contains__(self,*args,**kwargs卡塔尔剖断字符串中是否带有钦点字符,实譬喻下:

    >>> name = ‘Alexsbegcex’
  >>> name.__contains__(“e”)
  True
  >>> name.__contains__(“E”)
  False

   
 

 

字符串是编制程序中常用的品类,字符型在内部存储器中是以单个情势积累的,比方name =
“alex”,在内部存款和储蓄器中积累的款式为…

语法

find(卡塔尔方日语法:

str.find(str, beg=0, end=len(string))

 

语法

casefold(卡塔尔(قطر‎方拉脱维亚语法:

S.casefold()

 

参数

  • suffix — 该参数能够是一个字符串恐怕是一个因素。
  • start — 字符串中的最早地点。
  • end — 字符中截止地方。

参数

  • str — 钦定检索的字符串
  • beg — 开头索引,默感觉0。
  • end — 甘休索引,默感到字符串的长短。

返回值

重返将字符串中存有大写字符调换为小写后调换的字符串。

返回值

若果字符串含有内定的后缀重临True,否则重回False。

返回值

如果含有子字符串重返开头的索引值,否则重返-1。

实例

以下实例呈现了casefold(卡塔尔(قطر‎方法的实例:

#!/usr/bin/python3

S1 = "Runoob EXAMPLE....WOW!!!" #英文
S2 = "ß"  #德语

print( S1.lower() )
print( S1.casefold() )
print( S2.lower() )
print( S2.casefold() ) #德语的"ß"正确的小写是"ss"

  

以上实例输出结果如下:

runoob example....wow!!!
runoob example....wow!!!
ß
ss

 

实例

以下实例彰显了endswith(卡塔尔方法的实例:

#!/usr/bin/python3

Str='Runoob example....wow!!!'
suffix='!!'
print (Str.endswith(suffix))
print (Str.endswith(suffix,20))
suffix='run'
print (Str.endswith(suffix))
print (Str.endswith(suffix, 0, 19))

上述实例输出结果如下:

True
True
False
False

 

实例

以下实例展现了find(卡塔尔(قطر‎方法的实例:

#!/usr/bin/python3

str1 = "Runoob example....wow!!!"
str2 = "exam";

print (str1.find(str2))
print (str1.find(str2, 5))
print (str1.find(str2, 10))

 

如上实例输出结果如下:

7
7
-1

实例

>>>info = 'abca'
>>> print(info.find('a'))      # 从下标0开始,查找在字符串里第一个出现的子串,返回结果:0
0
>>> print(info.find('a', 1))   # 从下标1开始,查找在字符串里第一个出现的子串:返回结果3
3
>>> print(info.find('3'))      # 查找不到返回-1
-1
>>>

 

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