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  • 给大家总结了python中字符串内置函数的用法以及相关知识点内容,有兴趣的朋友学习下。
  • 本篇文章给大家带来的内容是关于python中字符串内置函数的用法介绍(代码) ,有一定的参考价值,有需要的朋友可以参考一下,希望对你有所帮助。capitalize() 首字母大写a=’someword’b=a.capitalize()print(b)—>...

    本篇文章给大家带来的内容是关于python中字符串内置函数的用法介绍(代码) ,有一定的参考价值,有需要的朋友可以参考一下,希望对你有所帮助。

    capitalize() 首字母大写a=’someword’

    b=a.capitalize()

    print(b)

    —>Someword

    casefold()&lower() 所有字母变小写,casefold可将未知字符便小写a=’someWORD’

    b=a.casefold()

    print(b)

    c=a.lower()

    print(c)

    —>someword

    —>someword

    center(width,fillchar=None) 设置宽度,并将内容居中,空白未知填充,一个字符a=’someword’

    b=a.center(30,’*’)

    print(b)

    count(sub,start=None,end=None) 去字符串中寻找,寻找子序列的出现次数,可指定起止点a=’somewordsomeword’

    b=a.count(‘or’)

    print(b)

    —>2

    startswith(suffix,start=None,end=None)&endswith(suffix,start=None,end=None) 是否以XX开始/结束,可指定起止点a=’somewordsomeword’

    b=a.startswith(‘sa’)

    c=a.endswith(‘ord’)

    print(b)

    print(c)

    —>False

    —>True

    find(sub,start=None,end=None) 寻找指定字符或字符串,并返回第一个位置,找不到返回-1,可指定起止点a=’somewordsomeword’

    b=a.find(‘me’)

    print(b)

    —>2

    format() 格式化,将一个字符串中的占位符替换为指定的值test=’I am {name},age {a}’

    v=test.format(name=’alex’,a=19)

    print(v)

    —>i am alex,age 19

    format_map() 格式化,传入的值test=’iam{name},age{a}’

    v=test.format_map({“name”:’alex’,”a”:19})

    print(v)

    —>i am alex,age 19

    isalnum() 字符串中是否只包含字母和数字a=’asdfs123*’

    b=a.isalnum()

    print(b)

    —>False

    expandtabs(tabsize=number) 将字符串以number分割,并将tab补入a=’asdfs123\t523fgbdf’

    b=a.expandtabs(5)

    print(b)

    —>asdfs123 523fgbdf

    isalpha() 字符串中是只包含字母a=’asdfsfgbdf’

    b=a.isalpha()

    print(b)

    —>True

    isdecimal()&isdigit()&isnumeric() 字符串中是只包含数字,isdigit更为强大,isnumeric还可识别中文a=’132132②二’

    b=a.isdecimal()

    c=a.isdigit()

    d=a.isnumeric()

    print(b)

    print(c)

    print(d)

    —>False

    —>False

    —>True

    isprintable() 是否存在不可显示的字符如换行符a=’sdfgdfg\t’

    b=a.isprintable()

    print(b)

    —>False

    isspace() 判断是否全部为空格a=’dsvsdv’

    b=a.isspace()

    print(b)

    —>False

    istitle()&title() 判断是否为标题,即首字母大写&变为标题a=’follow uncased characters and lowercase characters only cased ones’

    b=a.istitle()

    print(b)

    c=a.title()

    print(c)

    —>False

    —>Follow Uncased Characters And Lowercase Characters Only Cased Ones

    join(iterable) 将字符串中的每个元素按照指定分隔符进行拼接a=’一二三四五六七’

    print(a)

    b=’*’

    c=b.join(a)

    print(c)

    —>一二三四五六七

    —>一二三四五六七

    ljust(width,fillchar=None)&rjust(width,fillchar=None) 向右/左填充字符a=’hello’

    b=a.ljust(20,’*’)

    c=a.rjust(20,’*’)

    print(b)

    print(c)

    —>hello***************

    —>***************hello

    islower()&lower() 判断是是否为全小写&变为全部小写a=’Hello’

    b=a.islower()

    c=a.lower()

    print(b,c)

    —>False hello

    isupper()&c=a.upper() 判断是是否为全大写&变为全部大写a=’Hello’

    b=a.isupper()

    c=a.upper()

    print(b,c)

    —>False HELLO

    lstrip(chars=None)&rstrip(chars=None)&strip(chars=None) 去除字符串左边/右边/两边的字符串,默认空格,换行等a=’Hello’

    b=a.lstrip()

    c=a.rstrip()

    d=a.strip()

    print(b)

    print(c)

    print(d)

    —>Hello

    —> Hello

    —>Hello

    maketrans(*args,**kwargs)&translate(table) 按maketrans对应关系将translate中的字符串进行替换a=’asdgfrfbcvzxrentas’

    b=str.maketrans(‘xdsa’,’1234’)

    c=a.translate(b)

    print(c)

    —> 432gfrfbcvz1rent43

    partition(sep)&rpartition(sep) 将字符串按指定字符分割成3段/或从右开始a=’helwloasvxcwaewc’

    b=a.partition(‘w’)

    c=a.rpartition(‘w’)

    print(b)

    print(c)

    —>(‘hel’, ‘w’, ‘loasvxcwaewc’)

    —>(‘helwloasvxcwae’, ‘w’, ‘c’)

    split(sep=None,maxsplit=-1)&rsplit(sep=None,maxsplit=-1) 将字符串按指定字符串分割,分割后不保留a=’helwloasvxcwaewc’

    b=a.split(‘w’,2)

    c=a.rsplit(‘w’)

    print(b)

    print(c)

    —>[‘hel’, ‘loasvxc’, ‘aewc’]

    —>[‘hel’, ‘loasvxc’, ‘ae’, ‘c’]

    splitlines(keepends=None) 按照换行符进行分割,带true参数保留换行符a=’helwloas\nvxcwaewc\nafgasdfs’

    b=a.splitlines()

    c=a.splitlines(True)

    print(b)

    print(c)

    —>[‘helwloas’, ‘vxcwaewc’, ‘afgasdfs’]

    —>[‘helwloas\n’, ‘vxcwaewc\n’, ‘afgasdfs’]

    startswith(prefix,start=None,end=None)&endswith(prefix,start=None,end=None) 判断字符串是否以指定字符开始/结束,可指定起止点a=’aefsfsfeeav’

    b=a.startswith(‘ae’)

    c=a.endswith(‘av’,1,9)

    print(b)

    print(c)

    True

    —>False

    swapcase() 小写转变为大写a=’aefsfsfeeav’

    b=a.swapcase()

    print(b)

    —>AEFSFSFEEAV

    相关推荐:

    展开全文
  • capitalize() 首字母大写a='someword'b=a.capitalize()print(b)...lower() 所有字母变小写,casefold可将未知字符便小写a='someWORD'b=a.casefold()print(b)c=a.lower()print(c)—>someword—>somewordcenter...

    capitalize() 首字母大写

    a='someword'

    b=a.capitalize()

    print(b)

    —>Someword

    casefold()&lower() 所有字母变小写,casefold可将未知字符便小写

    a='someWORD'

    b=a.casefold()

    print(b)

    c=a.lower()

    print(c)

    —>someword

    —>someword

    center(width,fillchar=None) 设置宽度,并将内容居中,空白未知填充,一个字符

    a='someword'

    b=a.center(30,'*')

    print(b)

    count(sub,start=None,end=None) 去字符串中寻找,寻找子序列的出现次数,可指定起止点

    a='somewordsomeword'

    b=a.count(‘or')

    print(b)

    —>2

    startswith(suffix,start=None,end=None)&endswith(suffix,start=None,end=None) 是否以XX开始/结束,可指定起止点

    a='somewordsomeword'

    b=a.startswith(‘sa')

    c=a.endswith(‘ord')

    print(b)

    print(c)

    —>False

    —>True

    find(sub,start=None,end=None) 寻找指定字符或字符串,并返回第一个位置,找不到返回-1,可指定起止点

    a='somewordsomeword'

    b=a.find(‘me')

    print(b)

    —>2

    format() 格式化,将一个字符串中的占位符替换为指定的值

    test='I am {name},age {a}'

    v=test.format(name='alex',a=19)

    print(v)

    —>i am alex,age 19

    format_map() 格式化,传入的值

    test='iam{name},age{a}'

    v=test.format_map({“name”:'alex',”a”:19})

    print(v)

    —>i am alex,age 19

    isalnum() 字符串中是否只包含字母和数字

    a='asdfs123*'

    b=a.isalnum()

    print(b)

    —>False

    expandtabs(tabsize=number) 将字符串以number分割,并将tab补入

    a='asdfs123\t523fgbdf'

    b=a.expandtabs(5)

    print(b)

    —>asdfs123 523fgbdf

    isalpha() 字符串中是只包含字母

    a='asdfsfgbdf'

    b=a.isalpha()

    print(b)

    —>True

    isdecimal()&isdigit()&isnumeric() 字符串中是只包含数字,isdigit更为强大,isnumeric还可识别中文

    a='132132②二'

    b=a.isdecimal()

    c=a.isdigit()

    d=a.isnumeric()

    print(b)

    print(c)

    print(d)

    —>False

    —>False

    —>True

    isprintable() 是否存在不可显示的字符如换行符

    a='sdfgdfg\t'

    b=a.isprintable()

    print(b)

    —>False

    isspace() 判断是否全部为空格

    a='dsvsdv'

    b=a.isspace()

    print(b)

    —>False

    istitle()&title() 判断是否为标题,即首字母大写&变为标题

    a='follow uncased characters and lowercase characters only cased ones'

    b=a.istitle()

    print(b)

    c=a.title()

    print(c)

    —>False

    —>Follow Uncased Characters And Lowercase Characters Only Cased Ones

    join(iterable) 将字符串中的每个元素按照指定分隔符进行拼接

    a='一二三四五六七'

    print(a)

    b='*'

    c=b.join(a)

    print(c)

    —>一二三四五六七

    —>一二三四五六七

    ljust(width,fillchar=None)&rjust(width,fillchar=None) 向右/左填充字符

    a='hello'

    b=a.ljust(20,'*')

    c=a.rjust(20,'*')

    print(b)

    print(c)

    —>hello***************

    —>***************hello

    islower()&lower() 判断是是否为全小写&变为全部小写

    a='Hello'

    b=a.islower()

    c=a.lower()

    print(b,c)

    —>False hello

    isupper()&c=a.upper() 判断是是否为全大写&变为全部大写

    a='Hello'

    b=a.isupper()

    c=a.upper()

    print(b,c)

    —>False HELLO

    lstrip(chars=None)&rstrip(chars=None)&strip(chars=None) 去除字符串左边/右边/两边的字符串,默认空格,换行等

    a='Hello'

    b=a.lstrip()

    c=a.rstrip()

    d=a.strip()

    print(b)

    print(c)

    print(d)

    —>Hello

    —> Hello

    —>Hello

    maketrans(*args,**kwargs)&translate(table) 按maketrans对应关系将translate中的字符串进行替换

    a='asdgfrfbcvzxrentas'

    b=str.maketrans(‘xdsa','1234')

    c=a.translate(b)

    print(c)

    —> 432gfrfbcvz1rent43

    partition(sep)&rpartition(sep) 将字符串按指定字符分割成3段/或从右开始

    a='helwloasvxcwaewc'

    b=a.partition(‘w')

    c=a.rpartition(‘w')

    print(b)

    print(c)

    —>(‘hel', ‘w', ‘loasvxcwaewc')

    —>(‘helwloasvxcwae', ‘w', ‘c')

    split(sep=None,maxsplit=-1)&rsplit(sep=None,maxsplit=-1) 将字符串按指定字符串分割,分割后不保留

    a='helwloasvxcwaewc'

    b=a.split(‘w',2)

    c=a.rsplit(‘w')

    print(b)

    print(c)

    —>[‘hel', ‘loasvxc', ‘aewc']

    —>[‘hel', ‘loasvxc', ‘ae', ‘c']

    splitlines(keepends=None) 按照换行符进行分割,带true参数保留换行符

    a='helwloas\nvxcwaewc\nafgasdfs'

    b=a.splitlines()

    c=a.splitlines(True)

    print(b)

    print(c)

    —>[‘helwloas', ‘vxcwaewc', ‘afgasdfs']

    —>[‘helwloas\n', ‘vxcwaewc\n', ‘afgasdfs']

    startswith(prefix,start=None,end=None)&endswith(prefix,start=None,end=None) 判断字符串是否以指定字符开始/结束,可指定起止点

    a='aefsfsfeeav'

    b=a.startswith(‘ae')

    c=a.endswith(‘av',1,9)

    print(b)

    print(c)

    True

    —>False

    swapcase() 小写转变为大写

    a='aefsfsfeeav'

    b=a.swapcase()

    print(b)

    —>AEFSFSFEEAV

    展开全文
  • python中字符串内置函数expendtabs(tapsize=8)此函数在python文档中原文为: Return a copy of the string where all tab characters are replaced by one or more spaces, depending on the current column and the...

    python中字符串内置函数expendtabs(tapsize=8)此函数在python文档中原文为:
    Return a copy of the string where all tab characters are replaced by one or more spaces, depending on the current column and the given tab size. Tab positions occur every tabsize characters (default is 8, giving tab positions at columns 0, 8, 16 and so on). To expand the string, the current column is set to zero and the string is examined character by character. If the character is a tab (\t), one or more space characters are inserted in the result until the current column is equal to the next tab position. (The tab character itself is not copied.) If the character is a newline (\n) or return (\r), it is copied and the current column is reset to zero. Any other character is copied unchanged and the current column is incremented by one regardless of how the character is represented when printed.
    大致内容为:字符串内所有的制表符\t全部置换为n个空格,n为函数调用时()中tapsize的参数值,具体理解为:

    >>> str1='I love fish\t'
    >>> str1.expandtabs()
    'I love fish     '
    >>> str2='I love \t   fish'
    >>> str2.expandtabs()
    'I love     fish' 
    

    其中str1原文为‘I love fish‘’,从第一位开始算起f为第一个八位,故制表符扩充从i开始算,tapsize默认值为8,即从i后面开始扩展8位,无内容的地方用空格填充,故函数调用后字符串变为‘I love fish ’即h后补充五个空格。
    其中str2原文为‘I love \t fish’其中制表符在第七位,故扩充字符串下标为0-8的序列,\t前有一个空格,\t为占了两个空间,\t后存在三个空格,故转换后表现形式仅去掉了\t

    展开全文
  • capitalize() 首字母大写 a='someword'b=a.capitalize()print(b)...lower() 所有字母变小写,casefold可将未知字符便小写 a='someWORD'b=a.casefold()print(b)c=a.lower()print(c)—>someword—>somewordcent...

    capitalize() 首字母大写 a='someword'

    b=a.capitalize()

    print(b)

    —>Someword

    casefold()&lower() 所有字母变小写,casefold可将未知字符便小写 a='someWORD'

    b=a.casefold()

    print(b)

    c=a.lower()

    print(c)

    —>someword

    —>someword

    center(width,fillchar=None) 设置宽度,并将内容居中,空白未知填充,一个字符 a='someword'

    b=a.center(30,'*')

    print(b)

    count(sub,start=None,end=None) 去字符串中寻找,寻找子序列的出现次数,可指定起止点 a='somewordsomeword'

    b=a.count(‘or')

    print(b)

    —>2

    startswith(suffix,start=None,end=None)&endswith(suffix,start=None,end=None) 是否以XX开始/结束,可指定起止点 a='somewordsomeword'

    b=a.startswith(‘sa')

    c=a.endswith(‘ord')

    print(b)

    print(c)

    —>False

    —>True

    find(sub,start=None,end=None) 寻找指定字符或字符串,并返回第一个位置,找不到返回-1,可指定起止点 a='somewordsomeword'

    b=a.find(‘me')

    print(b)

    —>2

    format() 格式化,将一个字符串中的占位符替换为指定的值 test='I am {name},age {a}'

    v=test.format(name='alex',a=19)

    print(v)

    —>i am alex,age 19

    format_map() 格式化,传入的值 test='iam{name},age{a}'

    v=test.format_map({“name”:'alex',”a”:19})

    print(v)

    —>i am alex,age 19

    isalnum() 字符串中是否只包含字母和数字 a='asdfs123*'

    b=a.isalnum()

    print(b)

    —>False

    expandtabs(tabsize=number) 将字符串以number分割,并将tab补入 a='asdfs123\t523fgbdf'

    b=a.expandtabs(5)

    print(b)

    —>asdfs123 523fgbdf

    isalpha() 字符串中是只包含字母 a='asdfsfgbdf'

    b=a.isalpha()

    print(b)

    —>True

    isdecimal()&isdigit()&isnumeric() 字符串中是只包含数字,isdigit更为强大,isnumeric还可识别中文 a='132132②二'

    b=a.isdecimal()

    c=a.isdigit()

    d=a.isnumeric()

    print(b)

    print(c)

    print(d)

    —>False

    —>False

    —>True

    isprintable() 是否存在不可显示的字符如换行符 a='sdfgdfg\t'

    b=a.isprintable()

    print(b)

    —>False

    isspace() 判断是否全部为空格 a='dsvsdv'

    b=a.isspace()

    print(b)

    —>False

    istitle()&title() 判断是否为标题,即首字母大写&变为标题 a='follow uncased characters and lowercase characters only cased ones'

    b=a.istitle()

    print(b)

    c=a.title()

    print(c)

    —>False

    —>Follow Uncased Characters And Lowercase Characters Only Cased Ones

    join(iterable) 将字符串中的每个元素按照指定分隔符进行拼接 a='一二三四五六七'

    print(a)

    b='*'

    c=b.join(a)

    print(c)

    —>一二三四五六七

    —>一二三四五六七

    ljust(width,fillchar=None)&rjust(width,fillchar=None) 向右/左填充字符 a='hello'

    b=a.ljust(20,'*')

    c=a.rjust(20,'*')

    print(b)

    print(c)

    —>hello***************

    —>***************hello

    islower()&lower() 判断是是否为全小写&变为全部小写 a='Hello'

    b=a.islower()

    c=a.lower()

    print(b,c)

    —>False hello

    isupper()&c=a.upper() 判断是是否为全大写&变为全部大写 a='Hello'

    b=a.isupper()

    c=a.upper()

    print(b,c)

    —>False HELLO

    lstrip(chars=None)&rstrip(chars=None)&strip(chars=None) 去除字符串左边/右边/两边的字符串,默认空格,换行等 a='Hello'

    b=a.lstrip()

    c=a.rstrip()

    d=a.strip()

    print(b)

    print(c)

    print(d)

    —>Hello

    —> Hello

    —>Hello

    maketrans(*args,**kwargs)&translate(table) 按maketrans对应关系将translate中的字符串进行替换 a='asdgfrfbcvzxrentas'

    b=str.maketrans(‘xdsa','1234')

    c=a.translate(b)

    print(c)

    —> 432gfrfbcvz1rent43

    partition(sep)&rpartition(sep) 将字符串按指定字符分割成3段/或从右开始 a='helwloasvxcwaewc'

    b=a.partition(‘w')

    c=a.rpartition(‘w')

    print(b)

    print(c)

    —>(‘hel', ‘w', ‘loasvxcwaewc')

    —>(‘helwloasvxcwae', ‘w', ‘c')

    split(sep=None,maxsplit=-1)&rsplit(sep=None,maxsplit=-1) 将字符串按指定字符串分割,分割后不保留 a='helwloasvxcwaewc'

    b=a.split(‘w',2)

    c=a.rsplit(‘w')

    print(b)

    print(c)

    —>[‘hel', ‘loasvxc', ‘aewc']

    —>[‘hel', ‘loasvxc', ‘ae', ‘c']

    splitlines(keepends=None) 按照换行符进行分割,带true参数保留换行符 a='helwloas\nvxcwaewc\nafgasdfs'

    b=a.splitlines()

    c=a.splitlines(True)

    print(b)

    print(c)

    —>[‘helwloas', ‘vxcwaewc', ‘afgasdfs']

    —>[‘helwloas\n', ‘vxcwaewc\n', ‘afgasdfs']

    startswith(prefix,start=None,end=None)&endswith(prefix,start=None,end=None) 判断字符串是否以指定字符开始/结束,可指定起止点 a='aefsfsfeeav'

    b=a.startswith(‘ae')

    c=a.endswith(‘av',1,9)

    print(b)

    print(c)

    True

    —>False

    swapcase() 小写转变为大写 a='aefsfsfeeav'

    b=a.swapcase()

    print(b)

    —>AEFSFSFEEAV

    展开全文
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  • 文章来源:牵引小哥讲Python作者:牵引小哥1. str.capitalize()、str.upper()、str.lower()、str....str.upper()将字符串中的小写字母转为大写字母。str.lower()转换字符串中所有大写字符为小写。str.swapcas...
  • Python3,本身就已经内置有很多的函数: capitalize() 首字母强制转换为大写 test="chiLdren" v=test.capitalize() print(v) casefold() 所有字符全部转换为小写 v1=test.casefold() print(v1) ...
  • capitalize()将首字母大写,其他字母小写(只对首个字符是字母有效)# coding:utf-8name = 'bai ze'info = 'hello 白泽'_info = '白泽 hello'number_str = '1234'print(name.capitalize())print(info.capitalize())...
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  • python字符串内置函数

    2020-06-03 14:02:24
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